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Zhao, Mingchuan. „Electrochemical Studies of Lithium-Ion Battery Anode Materials in Lithium-Ion Battery Electrolytes“. Ohio University / OhioLINK, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1004388277.
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Best, Adam Samuel 1976. „Lithium-ion conducting electrolytes for use in lithium battery applications“. Monash University, School of Physics and Materials Engineering, 2001. http://arrow.monash.edu.au/hdl/1959.1/9240.
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Choi, Seungdon. „Soft chemistry synthesis and structure-property relationships of lithium-ion battery cathodes“. Access restricted to users with UT Austin EID Full text (PDF) from UMI/Dissertation Abstracts International, 2001. http://wwwlib.umi.com/cr/utexas/fullcit?p3025204.
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Annavajjula, Vamsi Krishna. „A FAILURE ACCOMMODATING BATTERY MANAGEMENT SYSTEM WITH INDIVIDUAL CELL EQUALIZERS AND STATE OF CHARGE OBSERVERS“. University of Akron / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=akron1190318540.
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Zhu, Wei. „A Smart Battery Management System for Large Format Lithium Ion Cells“. University of Toledo / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1301687506.
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Limoge, Damas Wilks. „Reduced-order modeling and adaptive observer design for lithium-ion battery cells“. Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/111722.
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Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2017.Cataloged from PDF version of thesis.
Includes bibliographical references (pages 167-171).
This thesis discusses the design of a control-oriented modeling approach to Lithium- Ion battery modeling, as well as the application of adaptive observers to this structure. It begins by describing the fundamental problem statement of a battery management system (BMS), and why this is challenging to solve. It continues by describing, in brief, several different modeling techniques and their use cases, then fully expounds two separate high fidelity models. The first model, the ANCF, was initiated in previous work, and has been updated with novel features, such as dynamic diffusion coefficients. The second model, the ANCF II, was developed for this thesis and updates the previous model to better solve the problems facing the construction of an adaptive observer, while maintaining its model accuracy. The results of these models are presented as well. After establishing a model with the desired accuracy and complexity, foundational observers are designed to estimate the states and parameters of the time-varying ionic concentrations in the solid electrode and electrolyte, as well as an a-priori estimate of the molar flux. For the solid electrode, it is shown that a regressor matrix can be constructed for the observer using both spatial and temporal filters, limiting the amount of additional computation required for this purpose. For the molar flux estimate, it is shown that fast convergence is possible with coefficients pertaining to measurable inputs and outputs, and filters thereof. Finally, for the electrolyte observer, a novel structure is established to restrict learning only along unknown degrees of freedom of the model system, using a Jacobian steepest descent approach. Following the results of these observers, an outline is sketched for the application of a machine learning algorithm to estimate the nonlinear effects of cell dynamics.
by Damas Wilks Limoge.
S.M.
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Abaza, Ahmed. „Safety of automotive lithium-ion battery cells under abusive conditions : innovation report“. Thesis, University of Warwick, 2017. http://wrap.warwick.ac.uk/105583/.
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The research carried out in this report focuses on the topic of safety of Li-ion battery cells, specifically for automotive applications. Electric vehicle battery safety is a challenge that must be tackled, especially with the rapid electrification of vehicles. Cell abuse testing simulates their failure process under different scenarios. This helps develop a deeper understanding of the failure process, its root cause and associated mechanisms, hence enabling the improvement of their safety. This research has experimentally investigated four abusive conditions; mechanical penetration, external short circuit, cell swelling as a result of overcharge and overcharge in an adiabatic environment. A number of potential industrial applications based on the research findings are also discussed. During nail penetration testing the effect of nail material and diameter were investigated. Firstly, cells were fully penetrated using 10 mm diameter nails with three different materials; copper, steel and plastic. Secondly, cells were penetrated using 10 and 3 mm diameter copper nails. It was found that there was a clear distinction between the outcome of the conducting and non-conducting nails. However, the outcome of using electrically conductive nails suffered from poor reproducibility. Post-mortem examination showed that at the point of penetration the nail dragged the copper current collector in the direction of penetration along with the separator. The hole in the positive electrode looked less circular and the aluminium current collector was not dragged as deep as the copper one. During external short circuit testing the effect of the short resistance and the short duration was investigated. Firstly, cells were short-circuited using a range of resistance values. Secondly, a programmable power supply to control the shorting duration was used. It was found that the degree of damage experienced by a cell during a short is not only defined by the short resistance, but also its duration. The cells were cycleable after the short circuit event and their capacity and resistance increase depended on the short circuit current magnitude and the short duration. Opening the cells after testing and studying their components using SEM showed no change in the surface morphology of the electrodes. During the third set of experiments, purpose-built equipment was designed and built for in-situ volume measurement. The change in cell volume during cycling, overcharge and 10 cycles after the overcharge event was monitored and measured in-situ. The effect of the degree of overcharge and the magnitude of the charging current were studied. After the overcharge event the cycling behaviour of the cells was investigated. Electrochemical Impedance Spectroscopy (EIS) and Direct Current Internal Resistance (DCIR) were used to track the change in resistance. An Equivalent Circuit Model (ECM) was built to investigate the individual components contributing to the cell’s impedance. The overcharge-induced capacity fade was analysed using incremental capacity analysis (ICA). The reversibility of cell volume after swelling was also investigated. Results show that cell swelling and the extent of damage depended on the degree of overcharge and the C-rate. Cell swelling was partially reversible and the cells were cycleable after the overcharge event. Finally, cells were overcharged in ambient and adiabatic conditions. This was carried out to study the effect of heat dissipation on the outcome of an overcharge event. Results highlighted the critical role of heat dissipation from the cell in determining the outcome of the test. The same overcharge regime under different conditions resulted in very different outcomes. Cells overcharged in ambient conditions swelled significantly, but did not vent nor catch fire, whereas, all cells overcharged under adiabatic conditions either ruptured or caught fire. The magnitude of the overcharge current in adiabatic conditions determined the failure mode. Cells overcharged using 0.13 C current ruptured after swelling significantly, but did not catch fire. Cells overcharged with 0.33 and 1.3 C currents were completely combusted.
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Stephenson, David E. „Modeling of Electronic and Ionic Transport Resistances Within Lithium-Ion Battery Cathodes“. Diss., CLICK HERE for online access, 2008. http://contentdm.lib.byu.edu/ETD/image/etd2437.pdf.
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Chahwan, John A. „Vanadium-redox flow and lithium-ion battery modelling and performance in wind energy applications“. Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=100223.
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As wind energy penetration levels increase, there is a growing interest in using storage devices to aid in managing the fluctuations in wind turbine output power. Vanadium-Redox batteries (VRB) and Lithium-Ion (Li-Ion) batteries are two emerging technologies which can provide power smoothing in wind energy systems. However, there is an apparent gap when it comes to the data available regarding the design, integration and operation of these batteries in wind systems. This thesis presents suitable battery electrical models which will be used to assess system performance in wind energy applications, including efficiency under various operating conditions, transfer characteristics and transient operation. A design, sizing and testing methodology for battery integration in converter based systems is presented. Recommendations for the development of operating strategies are then provided based on the obtained results.
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Roselli, Eric (Eric J. ). „Design of a testing device for quasi-confined compression of lithium-ion battery cells“. Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/68922.
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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2011.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 29).
The Impact and Crashworthiness Laboratory at MIT has formed a battery consortium to promote research concerning the crash characteristics of new lithium-ion battery technologies as used in automotive applications. Within a broad range of tests, there was a need to perform compression tests with a variable amount of confinement. A spring-loaded detainment device was designed which allows the battery to be confined in the axis perpendicular to compression without completely rigid walls. This provides a testing environment far more similar to the conditions of a real world crash situation. During an automobile crash event, the battery pack acts as a unit where each individual cell may experience a range of stresses from nearby cells or pack walls. An appropriate device was designed in Solidworks and used in the MIT ICL for testing with adjustable confinement during compression testing. MIT's research as a part of the consortium will continue for 3 more years beyond these initial tests. Never the less, the coming computational and constitutive models will be built using initial individual cell testing. Any model of a complete battery pack will use the material properties derived from cell testing.
by Eric Roselli.
S.B.
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Chebiam, Ramanan Venkata. „Lithium-ion battery cathodes : structural and chemical stabilities of layered cobalt and nickel oxides /“. Full text (PDF) from UMI/Dissertation Abstracts International, 2001. http://wwwlib.umi.com/cr/utexas/fullcit?p3008298.
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Filler, Frank E. „A pulsed power system design using lithium-ion batteries and one charger per battery“. Thesis, Monterey, California : Naval Postgraduate School, 2009. http://edocs.nps.edu/npspubs/scholarly/theses/2009/Dec/09Dec%5FFiller.pdf.
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Thesis (M.S. in Electrical Engineering)--Naval Postgraduate School, December 2009.Thesis Advisor(s): Julian, Alexander L. Second Reader: Crisiti, Roberto. "December 2009." Description based on title screen as viewed on January 28, 2010. Author(s) subject terms: Pulsed power, charger, buck converter, field programmable gate array (FPGA), lithium-ion batteries. Includes bibliographical references (p. 77-79). Also available in print.
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Prakash, Shruti. „The development and fabrication of miniaturized direct methanol fuel cells and thin-film lithium ion battery hybrid system for portable applications“. Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/28279.
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Thesis (M. S.)--Chemical Engineering, Georgia Institute of Technology, 2009.Committee Chair: Kohl, Paul; Committee Member: Fuller, Tom; Committee Member: Gray, Gary; Committee Member: Liu, Meilin; Committee Member: Meredith, Carson; Committee Member: Rincon-Mora, Gabriel.
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Svens, Pontus. „Methods for Testing and Analyzing Lithium-Ion Battery Cells intended for Heavy-Duty Hybrid Electric Vehicles“. Doctoral thesis, KTH, Tillämpad elektrokemi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-145166.
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Lithium-ion batteries designed for use in heavy-duty hybrid vehicles are continuously improved in terms of performance and longevity, but they still have limitations that need to be considered when developing new hybrid vehicles. The aim of this thesis has been to study and evaluate potential test and analysis methods suitable for being used in the design process when maximizing lifetime and utilization of batteries in heavy-duty hybrid vehicles. A concept for battery cell cycling on vehicles has been evaluated. The work included development of test equipment, verification of hardware and software as well as an extended period of validation on heavy-duty trucks. The work showed that the concept has great potential for evaluating strategies for battery usage in hybrid vehicles, but is less useful for accelerated aging of battery cells. Battery cells encapsulated in flexible packaging material have been investigated with respect to the durability of the encapsulation in a demanding heavy-duty hybrid truck environment. No effect on water intrusion was detected after vibration and temperature cycling of the battery cells. Aging of commercial battery cells of the type lithium manganese oxide - lithium cobalt oxide / lithium titanium oxide (LMO-LCO/LTO) was investigated with different electrochemical methods to gain a deeper understanding of the origin of performance deterioration, and to understand the consequences of aging from a vehicle manufacturer's perspective. The investigation revealed that both capacity loss and impedance rise were largely linked to the positive electrode for this type of battery chemistry. Postmortem analysis of material from cycle-aged and calendar-aged battery cells of the type LMO-LCO/LTO and LiFePO4/graphite was performed to reveal details about aging mechanisms for those cell chemistries. Analysis of cycle-aged LMO-LCO/LTO cells revealed traces of manganese in the negative electrode and that the positive electrode exhibited the most severe aging. Analysis of cycle-aged LFP/graphite cells revealed traces of iron in the negative electrode and that the negative electrode exhibited the most severe aging.Litiumjonbatterier anpassade för användning i tunga hybridfordon förbättras kontinuerligt med avseende på prestanda och livslängd men har fortfarande begränsningar som måste beaktas vid utveckling av nya hybridfordon. Syftet med denna avhandling har varit att studera och utvärdera potentiella prov- och analysmetoder lämpliga för användning i arbetet med att maximera livslängd och utnyttjandegrad av batterier i tunga hybridfordon. Ett koncept för battericykling på fordon har utvärderats. Arbetet innefattade utveckling av testutrustning, verifiering av hårdvara och mjukvara samt en längre periods validering på lastbilar. Arbetet har visat att konceptet har stor potential för utvärdering av strategier för användandet av batterier i hybridfordon, men är mindre användbar för åldring av batterier. Batterier kapslade i flexibelt förpackningsmaterial har undersökts med avseende på kapslingens hållbarhet i en krävande hybridlastbilsmiljö. Ingen påverkan på fuktinträngning kunde påvisas efter vibration och temperaturcykling av de testade battericellerna. Åldring av kommersiella battericeller av typen litiummanganoxid - litiumkoboltoxid/litiumtitanoxid (LMO-LCO/LTO) undersöktes med olika elektrokemiska metoder för att få en djupare förståelse för prestandaförändringens ursprung och för att förstå konsekvenserna av åldrandet ur en fordonstillverkares användarperspektiv. Undersökningen visade att både kapacitetsförlust och impedanshöjning till största delen var kopplat till den positiva elektroden för denna batterityp. Post-mortem analys av material från cyklade och kalenderåldrade kommersiella battericeller av typen LMO-LCO/LTO och LiFePO4/grafit utfördes för att avslöja detaljer kring åldringsmekanismerna för dessa cellkemier. Vid analys av cyklade LMO-LCO/LTO celler påvisades mangan i den negativa elektroden samt uppvisade den positiva elektroden kraftigast åldring. Vid analys av cyklade LFP/grafit celler påvisades järn i den negativa elektroden samt uppvisade den negativa elektroden kraftigast åldring.
QC 20140520
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Mason, Amber J. „Material characterization and axial loading response of pouch lithium ion battery cells for crash safety“. Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/112040.
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Thesis: Nav.E., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2017.Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2017.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 75-76).
Recent research conducted at MIT's Impact and Crashworthiness Laboratory (ICL) has focused on material characterization of lithium ion battery cell components for use in the development of an accurate and practical computational model intended to predict mechanical deformation and related short circuit behavior of Li-ion battery cells and stacks in real world impact scenarios. In an effort to continue to refine and validate this modeling tool, characterization testing was conducted on battery cell pouch material using uniaxial stress and biaxial punch tests. At the full cell level, hemispherical punch indentation validation testing and internal electric short circuit testing was conducted on large, high energy pouch cells. Further investigations at the full cell level examined the buckling response of small pouch cells as a result of in-plane axial compression under varying degrees of confinement. To this end, a custom testing device was designed and constructed to provide controllable cell confinement for axial loading experimentation purposes. All experimentation results will feed into a computational model of the cell extended for use in comprehensive mechanical deformation simulation modeling.
by Amber J. Mason.
Nav.E.
S.M.
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Lenze, Georg [Verfasser]. „Simulation-supported investigation of manufacturing impacts on the performance of lithium-ion-battery cells / Georg Lenze“. München : Verlag Dr. Hut, 2020. http://d-nb.info/1219471402/34.
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Campbell, John Earl Jr. „Development of a constitutive model predicting the point of short-circuit within lithium-ion battery cells“. Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/74891.
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Thesis (Nav. E. and S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2012.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 56-57).
The use of Lithium Ion batteries continues to grow in electronic devices, the automotive industry in hybrid and electric vehicles, as well as marine applications. Such batteries are the current best for these applications because of their power density and cyclic life. The United States Navy and the automotive industries have a keen interest in making and maintaining these batteries safe for use within the public. The testing necessary to ensure this safety is time consuming and expensive to manufacturers, thus a constitutive model that can emulate the effects of mechanical abuse to a battery cell or pack is necessary to be able to rapidly test various configurations and enclosures to preclude possible short circuit and thermal runaway of an installed battery is necessary. Homogenized computational cells have been developed at the MIT Crashworthiness laboratory and this research validates and refines those models for use in future work with both cylindrical and prismatic cells.A total of 22 mechanical abuse tests were conducted on partially charged cylindrical and pouch/prismatic Li-Jon cells under multiple loading conditions. The tests included lateral compression by cylindrical rods of various sizes, three point bending tests, and hemispherical punch tests on cylindrical cells. For the pouch/prismatic cells, the tests included hemispherical punch tests of various sizes as well as a conical punch test, vertical cylindrical punch test, and rectangular punch test. The tests measured the force imparted to the cell, linear displacement oft he punch into the cell structure, voltage output of the cell, as well as the temperature at the surface of the cell.The test data was utilized to validate and refine homogenous computational models for both cylindrical and pouch/prismatic Li-Ion cells for future use in the MIT Crashworthiness laboratory. The computational models subjected to simulated tests that were conducted on actual cells in the laboratory conclude that the computational models are valid and behave well compared to actual cells.This paper reports on results generated for the Li-Ion Battery Consortium at MIT.
by John Earl Campbell Jr.
Nav.E.and S.M.
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Dareini, Ali. „Prediction and analysis of model’s parameters of Li-ion battery cells“. Thesis, Blekinge Tekniska Högskola, Institutionen för tillämpad signalbehandling, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-11799.
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Lithium-ion batteries are complex systems and making a simulation model of them is always challenging. A method for producing an accurate model with high capabilities for predicting the behavior of the battery in a time and cost efficient way is desired in this field of work. The aim of this thesis has been to develop a method to be close to the desired method as much as possible, especially in two important aspects, time and cost. The method which is the goal of this thesis should fulfill the below five requirements: 1. Able to produce a generic battery model for different types of lithium-ion batteries 2. No or low cost for the development of the model 3. A time span around one week for obtaining the model 4. Able to predict the most aspects of the battery’s behavior like the voltage, SOC, temperature and, preferably, simulate the degradation effects, safety and thermal aspects 5. Accuracy with less than 15% error The start point of this thesis was the study of current methods for cell modeling. Based on their approach, they are divided into three categories, abstract, black box and white box methods. Each of these methods has its own advantages and disadvantages, but none of them are able to fulfill the above requirements. This thesis presents a method, called “gray box”, which is, partially, a mix of the black and white boxes’ concepts. The gray box method uses values for model’s parameters from different sources. Firstly, some chemical/physical measurements like in the case of the white box method, secondly, some of the physical tests/experiments used in the case of the black box method and thirdly, information provided by cell datasheets, books, papers, journals and scientific databases. As practical part of this thesis, a prismatic cell, EIG C20 with 20Ah capacity was selected as the sample cell and its electrochemical model was produced with the proposed method. Some of the model’s parameters are measured and some others are estimated. Also, the abilities of AutoLion, a specialized software for lithium-ion battery modeling were used to accelerate the modeling process. Finally, the physical tests were used as part of the references for calculating the accuracy of the produced model. The results show that the gray box method can produce a model with nearly no cost, in less than one week and with error around 30% for the HPPC tests and, less than this, for the OCV and voltage tests. The proposed method could, largely, fulfill the five mentioned requirements. These results were achieved even without using any physical tests/experimental data for tuning the parameters, which is expected to reduce the error considerably. These are promising results for the idea of the gray box which is in its nascent stages and needs time to develop and be useful for commercial purposes.
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König, Nikolaj, und Johan Norlin. „Quality Improvements for Anode Coating in Lithium-Ion Battery Cell Manufacturing : A Case Study at Northvolt Labs“. Thesis, Luleå tekniska universitet, Institutionen för ekonomi, teknik, konst och samhälle, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-85997.
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Lithium-ion batteries (LIB) represent a promising energy storage solution in the pursuit of electrification to combat climate change. In order for LIBs to be used across different industries, they have to be commercially viable. The viability for manufacturing LIBs at scale is increasing, with manufacturing costs decreasing 89% in the last ten years. However, the LIB manufacturing process is complex and can generate large amounts of scrap due to various non-conformities (NCs). Therefore, to further increase the ability to manufacture high-quality LIBs at scale, it is crucial to minimize the occurrence of NCs by understanding their root causes. This thesis examines the characteristics of one of the non-conformities occurring in the electrode coating process, namely the formation of craters on the coated surface of the anode electrode. The thesis was conducted at Northvolt Labs using a DMAIC approach to establish relationships between various process parameters and the formation of craters in two processes, coating, and its precursor process, slurry mixing. Utilizing the data models linear regression, CART regression, regularized linear regression, and a slurry experiment, process parameters and characteristics that affect crater formation were identified. Firstly, from the data models, it was distinguished that the speed of the supply pump used in transferring the slurry from the supply tank to the slot die, and the pressure in the filter pump, have the largest effect on crater formation. Further, the time that the slurry spends in storage, i.e. from a completely mixed slurry batch to it being applied in coating, affects crater formation. In this case, the longer the slurry is stored, the more craters are found. Another notable result is that refilling the coating supply tank induces crater formation. The mentioned results indicate that the various stages of slurry transfer undertaken before coating can result in advantageous conditions for craters to form. Moreover, it was discovered that changes in the loading level of the coated anode surface can indicate crater formation. The slurry experiment discovered that by contaminating the slurry with lubricant grease, NCs with similar characteristics to the crater could be generated. While not likely related to craters, this result provides valuable insights for slurry contamination. In addition to the data models and experiments, actions to facilitate future statistical analysis investigations are proposed. This thesis also proposes actions that can be undertaken to potentially mitigate the formation of craters. Suggested actions include methods to investigate the optimal storage time of the slurry before used in coating. Further, we recommend that the coating process should be monitored through the use of control charts on the loading level measurements of the coated surface. Consequently, large changes in loading level can be detected, entailing potential crater formation. We also propose adding lubricant grease as a potential risk in the PFMEA Northvolt uses for process risk evaluation. This recommendation is also complemented with suggested actions on how to handle the risks of lubricant grease contamination.Användandet av litiumjonbatterier (LIB) som energilagring är en potentiell lösning för omställning till ett elektrifierat samhälle. Tillverkningsprocessen för LIBs är dock komplex och har en tendens att generera stora mängder kassationer på grund av olika typer av defekter. Denna studie ämnar att undersöka egenskaperna hos en av defekterna som kallas krater som kan förekomma i en av delprocesserna för litiumjonbatteritillverkning, elektrodbeläggning, där batteriets elektroder skapas genom att en blandning av aktiva material appliceras på en metallfolie. Kratern förekommer som en cirkulär form på den belagda ytan av anodelektroden. Studien genomfördes hos batteritillverkaren Northvolt Labs och använde en struktur enligt DMAIC cykeln. Syftet med studien var att fastställa samband mellan olika processparametrar och kraterformation för två olika processer, elektrodbeläggning och dess föregångare, framställning av den aktiva materialblandningen. Genom att använda datamodellerna linjär regression, CART-regression, en regulariserad linjär regression samt ett experiment kunde processparametrar och egenskaper som påverkar kraterbildningen etableras. Resultaten från datamodellerna indikerar att varvtalet i pumpen som tillför ytbeläggningsmaskinen med den aktiva materialblandningen samt trycket i filterpumpen har den största effekten på kraterbildning. Vidare så påverkar tiden som den aktiva materialblandningen lagras innan den används i beläggningsprocessen. Resultaten indikerar att ju längre tid en aktiv materialblandning lagras, desto mer kraterbildning. Samtliga resultat som nämnts ovan anvisar att de olika stadier den aktiva materialblandningen överförs bland olika behållare och verktyg kan ge upphov till kraterbildning. Ytterligare resultat från datamodellerna indikerar att en minskad tjocklek av den belagda ytan, mätt med enheten g/cm2, kan påvisa när kratrar uppstår. Detta resultat kan härledas till att kratrarna orsakar en nedåtbuktning i den belagda ytan. Utifrån experimentet med den aktiva materialblandningen kunde det fastlås att kraterliknande defekter kunde genereras genom att kontaminera blandningen med smörjfett. Dessa defekter är sannolikt inte besläktade med kratern, men dess uppkomst ger värdefulla insikter hur kontaminering kan påverka kvaliteten på den belagda ytan. Utöver resultat från datamodellerna och experimentet så presenterar även denna studie förslag på hur framtida undersökningar av statistisk karaktär kan förbättras. Studien föreslår också konkreta åtanganden som kan genomföras med syfte att reducera kraterbildning. Detta inkluderar hur ett projekt med syfte att fastslå den optimala lagringstiden för den aktiva materialblandningen innan den används i ytbeläggningsprocessen kan utformas. Vidare rekommenderas att ytbeläggningsprocessen övervakas med hjälp av att upprätta styrdiagram för ytbeläggningens nivåförändringar. Följaktligen kan stora förändringar i ytbeläggningens jämnhet detekteras, vilket kan vara en indikator på kraterbildning. Studien rekommenderar också att tillägga kontaminering av smörjfett i den aktiva materialblandningen som en potentiell risk i Northvolts PFMEA. Denna rekommendation kompletteras även med förslag på åtanganden som kan tas för att hantera risken för kontaminering av smörjfett.
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Kasavajjula, Uday S. „Role of phase transformation processes in determining the discharge behavior of electrodes in lithium ion battery a dissertation presented to the faculty of the Graduate School, Tennessee Technological University /“. Click to access online, 2009. http://proquest.umi.com/pqdweb?index=22&sid=4&srchmode=1&vinst=PROD&fmt=6&startpage=-1&clientid=28564&vname=PQD&RQT=309&did=1756844351&scaling=FULL&ts=1250862718&vtype=PQD&rqt=309&TS=1250864217&clientId=28564.
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Xu, Mingming. „Electrochemical Kinetics Studies of Copper Anode Materials in Lithium Battery Electrolyte“. Ohio University / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1127139833.
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Kayser, Steffen Alexander Verfasser], Josef [Akademischer Betreuer] Granwehr und Joachim [Akademischer Betreuer] [Mayer. „In-operando characterization of transport and transformation processes in lithium-ion and metal-air battery cells / Steffen Alexander Kayser ; Josef Granwehr, Joachim Mayer“. Aachen : Universitätsbibliothek der RWTH Aachen, 2019. http://d-nb.info/1189672375/34.
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Zenati, Ali. „Gestion haut niveau et suivi en ligne de l'état de santé des batteries lithium-ion“. Thesis, Université de Lorraine, 2012. http://www.theses.fr/2012LORR0391/document.
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Les batteries lithium-ion sont considérées de nos jours comme la solution optimale pour les systèmes de stockage d'énergie, et cela est dû principalement à leurs hautes densités d'énergie et de puissance. Leurs performances, durées de vie, et fiabilités sont liées et dépendent des conditions d'utilisations telles que la température et les courants demandés par l'application. Et afin d'avoir un suivi de l'évolution du vieillissement de la batterie, la détermination de son état de santé (State-Of-Health -SOH-) est une fonction majeure à considérer. Ce mémoire expose les méthodologies ou techniques développées pour la gestion de la durée de vie de la batterie lithium-ion, et plus particulièrement pour la détermination de son état de santé, en se basant sur ses propres paramètres principaux qui sont la capacité et la résistance ohmique. Cette démarche permet de basculer d'un SOH statique (basé sur un modèle prédéfini de vieillissement tenant compte du calendaire et du cyclage en fonction des caractéristiques telles que la température et le courant de la batterie suivies en temps réel) vers un SOH dynamique ou auto-adaptatif, puisqu'il est basé sur un modèle du composant électrochimique dont les paramètres précédents sont évaluées en temps réel en fonction des conditions d?utilisation. Le premier chapitre revient sur les généralités concernant la technologie lithium-ion : caractéristiques, performances, constitution de l'élément de stockage, choix et nature des électrodes... Le principe de fonctionnement avec les équations générales des phénomènes électrochimiques sont aussi développés. Le second chapitre est un état de l'art des méthodologies de prédiction de la durée de vie avec les différentes classifications des modèles et des techniques de prédiction. Puis lors du troisième chapitre, nous aborderons nos méthodologies développées et les techniques utilisées, telles que le calcul statistique, la logique floue et les lois de vieillissement pour la détermination d'un état de santé dynamique de la batterie, qui en plus de la prise en compte de l'état de santé statique, c'est-à-dire basé seulement sur le vieillissement calendaire et en cyclage, considérera aussi l'évolution de la capacité et de la résistance ohmique de la batterie, en fonction du temps et des conditions d'utilisation, permettant ainsi de considérer les phénomènes improbables. Enfin dans le dernier chapitre, nous exposerons les résultats obtenus lors des tests de validations sur banc de puissance et de prototypage rapide sur des éléments réelsLithium-ion batteries are considered nowadays as the optimal issue for the energy storage systems, it is mainly due to their high energy and power density. Their performances, lifetime, and reliability are related and depend on the operating conditions such as the temperature and requested current by the application. And in order to track the evolution of the ageing of the battery, the determination of its State-Of-Health -SOH- is a major function to consider. This thesis presents both methodologies and techniques developed for the management of the lifetime of lithium-ion battery, and more particularly the assessment of its state-of-health, based on its own main parameters which are the capacity and the ohmic resistance. This approach allows to switch from a static SOH (based on a predefined ageing model, which take into account the calendar and cycling ageing of the battery, according to some characteristics such as the temperature and the courant of the battery tracked in real time) to a dynamic SOH (self-adaptive) using an online assessment of the previous parameters according to the operating conditions. The first chapter is an overview about the lithium-ion technology: characteristics, performances, cell design, choice and nature of the electrodes... The operating principle with the general equations are also developed. The second chapter is a state of the art of the lifetime prediction methodologies with the different kinds of classification of models and prediction techniques. Then in the third chapter, we will discuss our methodologies and the developed techniques, such as the use of statistics, fuzzy logic and rules of ageing to assess a dynamic state of health of the battery, which not only does take into account the static SOH (calendar and cycling ageing), but also considers the evolution of the ohmic resistance and the capacity of the battery, depending on the time and the operating conditions. This allows taking into consideration unlikely phenomena. Finally, in the last chapter, we will expose obtained results from validation tests. These tests were done under a power electrical testbench and a rapid prototyping testbench with real cells
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Huang, Shan. „Nano-chemo-mechanics of advanced materials for hydrogen storage and lithium battery applications“. Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/42710.
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Chemo-mechanics studies the material behavior and phenomena at the interface of mechanics and chemistry. Material failures due to coupled chemo-mechanical effects are serious roadblocks in the development of renewable energy technologies. Among the sources of renewable energies for the mass market, hydrogen and lithium-ion battery are promising candidates due to their high efficiency and easiness of conversion into other types of energy. However, hydrogen will degrade material mechanical properties and lithium insertion can cause electrode failures in battery owing to their high mobilities and strong chemo-mechanical coupling effects. These problems seriously prevent the large-scale applications of these renewable energy sources. In this thesis, the atomistic and continuum modeling are performed to study the chemical-mechanical failures. The objective is to understand the hydrogen embrittlement of grain boundary engineered metals and the lithium insertion-induced fracture in alloy electrodes for lithium-ion batteries.
Hydrogen in metallic containment systems such as high-pressure vessels and pipelines causes the degradation of their mechanical properties that can result in sudden catastrophic fracture. A wide range of hydrogen embrittlement phenomena was attributed to the loss of cohesion of interfaces (between grains, inclusion and matrix, or phases) due to interstitially dissolved hydrogen. Our modeling and simulation of hydrogen embrittlement will address the question of why susceptibility to hydrogen embrittlement in metallic materials can be markedly reduced by grain boundary engineering. Implications of our results for efficient hydrogen storage and transport at high pressures are discussed.
Silicon is one of the most promising anode materials for Li-ion batteries (LIB) because of the highest known theoretical charge capacity. However, Si anodes often suffer from pulverization and capacity fading. This is caused by the large volume changes of Si (~300%) upon Li insertion/extraction close to the theoretical charging/discharging limit. In particular, large incompatible deformation between areas of different Li contents tends to initiate fracture, leading to electro-chemical-mechanical failures of Si electrodes. In order to understand the chemo-mechanical mechanisms, we begin with the study of basic fracture modes in pure silicon, and then study the diffusion induced deformation and fracture in lithiated Si. Results have implications for increasing battery capacity and reliability.
To improve mechanical stability of LIB anode, failure mechanisms of silicon and coated tin-oxide nanowires have been studied at continuum level. It's shown that anisotropic diffusivity and anisotropic deformation play vital roles in lithiation process. Our predictions of fracture initiation and evolution are verified by in situ experiment observations. Due to the mechanical confinement of the coating layers, our study demonstrates that it is possible to simultaneously control the electrochemical reaction rate and the mechanical strain of the electrode materials through carbon or aluminum coating, which opens new avenues of designing better lithium ion batteries.
This thesis addresses the nano-chemo-mechanical failure problems in two green energy-carrier systems toward improving the performance of Li-ion battery anode and hydrogen storage system. It provides an atomistic and continuum modeling framework for the study of chemo-mechanics of advanced materials such as nano-structured metals and alloys. The results help understand the chemical effects of impurities on the mechanical properties of host materials with different metallic and covalent bonding characteristics.
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Schlasza, Christian. „Analysis of aging mechanisms in Li-ion cells used for traction batteries of electric vehicles and development of appropriate diagnostic concepts for the quick evaluation of the battery condition“. Thesis, Belfort-Montbéliard, 2016. http://www.theses.fr/2016BELF0155.
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Dans cette thèse, les mécanismes de vieillissement des cellules Li-ion sont analysés sur un niveau théorique,assisté par une AMDEC (Analyse des modes de défaillance, de leurs effets et de leur criticité). L'accent est mis surla famille des cellules lithium fer phosphate (LFP) utilisées comme batteries de traction dans les applicationsvéhicules électriques.L'objectif de la partie xpérimentale de cette thèse est le développement d'un concept d'un outil de diagnostic pourla détermination rapide d'état de la batterie. Une expérience de vieillissement accélérée est réalisée avec un groupede cellules LFP de haute capacité (70Ah). Les cellules sont analysées en utilisant des méthodes de mesured'impédance dans les domaines temporel et fréquentiel. La pectroscopie d'Impédance Électrochimique (SIE, ouEIS en anglais) s'est trouvée être un bon outil pour révéler des informations intéressantes sur l'état de santé (Stateof-Health, SOH) de la batterie.Des modèles de batterie sont utilisés pour l'interprétation des résultats de mesure. En comparant différents modèlesdu circuit équivalent (ECMs), un modèle est choisi. Ce modèle est utilisé pour la détermination du SOC et étendupour la détermination du SOH. Un concept pour la détermination du SOH est développé, permettant uneapproximation de la capacité de la batterie dans une période de temps de moins de 30s, si les onditions de labatterie et d'environnement, comme la température et l'état de charge de la batterie, sont connusIn this thesis, the aging mechanisms withing Li-ion cells are analyzed on a theoretical level, supported by an FMEA(Failure ode and Effects Analysis). The focus lies on the group of lithium iron phosphate (LFP) cells used fortraction batteries in electric vehicles. Scope of the experimental part of the thesis is the development of a diagnosticconcept for the quick battery state determination. A group of high capacity LFP cells (70Ah) designed for tractionpurposes in electric vehicles is aged artificially and investigated afterwards by impedance measurements in the timeand frequency domain. Electrochemical impedance spectroscopy (EIS) is found to reveal interesting information onthe battery's State-of-Health (SOH).For the interpretation of the measurement results, battery models are employed. Different equivalent circuit models(ECMs) are compared and an appropriate model is chosen, which is used for the SOC (State-of-Charge)determination and extended for the SOH (State-of-Health) determination. An SOH determination concept isdeveloped, which allows the approximation of the cell capacity in less than 30s, if the battery and environmentalconditions, such as the temperature and the cell's SOC, are known
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Wennberg, Emma. „Solcellssystem i kombination med batterilager : En fallstudie av Uppsalas nya stadsbussdepå“. Thesis, Uppsala universitet, Institutionen för fysik och astronomi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-325218.
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In this thesis the potential benefits of combining a photovoltaic (PV) system with a battery storage are investigated. The thesis is conducted at the company WSP in Uppsala and the aim is to design a PV system for the new city bus depot that is planned to be built in Uppsala, estimate the PV system capacity and investigate whether a battery storage can increase the self-consumption of the system. The results of this study are that the most appropriate installation of the PV modules is to place them horizontally on the roof and by that one can achieve an installed power of 715 kWp and a total annual electricity production of 871 MWh. This corresponds to a self-sufficiency of 29 % and a self-consumption of 92 %, which indicate that overproduction of electricity sometimes occurs. How different battery storages, based on both lead-acid and lithium-ion batteries, affect the system is evaluated by developing a battery model in MATLAB. From the results of the battery model it is concluded that battery storages with a capacity of 0.3–0.8 kWh/kWp are most suitable to combine with the PV system and this applies to both lead-acid and lithium-ion batteries. The interval 0.3–0.8 kWh/kWp corresponds to battery capacities of 200–600 kWh and the self-consumption increases to 93–94 % for the lead-acid battery storages and to 93–95 % for the lithium-ion battery storages. The economic analysis show that it is generally more profitable to increase self-consumption of self-produced PV power than to sell it to the grid. However, the high costs that are associated with the battery storages eliminates the economic benefits of the increased self-consumption of PV power. Therefore, it is not considered possible to justify the installation of a battery storage at the bus depot.
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Kaplenko, Oleksii. „Studium elektrodových materiálů pro Li-Ion akumulátory pomocí elektronové mikroskopie“. Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2018. http://www.nusl.cz/ntk/nusl-377024.
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The aim of this work is to describe the influence of temperature on the structure and chemical composition of electrode materials for Li-ion accumulators. Theoretical part of this thesis contains described terminology and general issues of batteries and their division. Every kind of battery is provided with a closer description of a specific battery type. A separate chapter is dedicated to lithium cells, mainly Li-ion batteries. Considering various composition of Li-ion batteries, the next subchapters deeply analyzes the most used cathode (with an emphasis on the LiFePO4, LiMn1/3Ni1/3Co1/3O2) and anode materials (with an emphasis on the Li4Ti5O12). The next chapters describe the used analytical methods: electron microscopy, energy dispersion spectroscopy and thermomechanical analysis. The practical part is devoted to the description of the individual experiments and the achieved results.
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Jaššo, Kamil. „Vliv lisovacího tlaku na elektrochemické vlastnosti elektrod pro akumulátory Li-S“. Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2016. http://www.nusl.cz/ntk/nusl-254484.
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The purpose of this diploma thesis is to describe the impact of compaction pressure on the electrochemical parameters of lithium-sulfur batteries. Theoretical part of this thesis contains briefly described terminology and general issues of batteries and their division. Every kind of battery is provided with a closer description of a specific battery type. A separate chapter is dedicated to lithium cells, mainly lithium-ion batteries. Considering various composition of lithium-ion batteries, this chapter deeply analyzes mostly used active materials of electrodes, used electrolytes and separators. Considering that the electrochemical principle of Li-S and Li-O batteries is different to Li-ion batteries, these accumulators of new generation are included in individual subhead. In the experimental part of this thesis are described methods used to measure electrochemical parameters of Li-S batteries. Next chapter contains description of preparing individual electrodes and their composition. Rest of the experimental part of my thesis is dedicated to the description of individual experiments and achieved results.
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Ren, Yu. „Applications of ordered mesoporous metal oxides : energy storage, adsorption, and catalysis“. Thesis, University of St Andrews, 2010. http://hdl.handle.net/10023/1705.
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The experimental data and results demonstrated here illustrate the preparation and application of mesoporous metal oxides in energy storage, adsorption, and catalysis. First, a new method of controlling the pore size and wall thickness of mesoporous silica was developed by controlling the calcination temperature. A series of such silica were used as hard templates to prepare the mesoporous metal oxide Co₃O₄. Using other methods, such as varying the silica template hydrothermal treatment temperature, using colloid silica, varying the materials ratio etc., a series of mesoporous β-MnO₂ with different pore size and wall thickness were prepared. By using these materials it has been possible to explore the influence of pore size and wall thickness on the rate of lithium intercalation into mesoporous electrode. There is intense interest in lithium intercalation into titanates due to their potential advantages (safety, rate) replacing graphite for new generation Li-ion battery. After the preparation of an ordered 3D mesoporous anatase the lithium intercalation as anode material has been investigated. To the best of our knowledge, there are no reports of ordered crystalline mesoporous metal oxides with microporous walls. Here, for the first time, the preparation and characterization of three dimensional ordered crystalline mesoporous α-MnO₂ with microporous wall was described, in which K+ and KIT-6 mesoporous silica act to template the micropores and mesopores, respectively. It was used as a cathode material for Li-ion battery. Its adsorption behavior and magnetic property was also surveyed. Following this we described the preparation and characterization of mesoporous CuO and reduced Cu[subscript(x)]O, and demonstrated their application in NO adsorption and delivery. Finally a series of crystalline mesoporous metal oxides were prepared and evaluated as catalysts for the CO oxidation.
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Amigues, Adrien Marie. „New metastable cathode materials for lithium-ion batteries“. Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/276299.
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This PhD work is dedicated to the discovery and study of new cathode materials for lithium-ion batteries. To obtain new materials, a well-known strategy based on ion-exchanging alkali metals within stable crystalline frameworks was used. Ion-exchange procedures between sodium and lithium ions were performed on known sodiated materials, NaMnTiO4 with the Na0.44MnO2 structure and NaFeTiO4 and Na2Fe3-xSn2xSb1-xO8 (0 ≤ x ≤ 1) with the calcium-ferrite structure. A combination of Energy-Dispersive X-ray Spectroscopy (EDS), Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES), X-ray (XRD) and Neutron (NPD) diffractions was used to determine the crystal structure of the samples obtained via ion-exchange and confirmed that LiMnTiO4 and LiFeTiO4 and Li2Fe3-xSn2xSb1-xO8 (0 ≤ x ≤ 1) were obtained with a 1:1 ion-exchange between sodium and lithium. LiMnTiO4 has the orthorhombic Pbam space group, with a = 9.074(5), b = 24.97(1) and c = 2.899(2) Å. The shapes and dimensions of the channels are modified compared to NaMnTiO4, with displaced alkali metal positions and occupancies. LiMnTiO4 was cycled vs Li and up to 0.89 lithium ions can be reversibly inserted into the structure, with a discharge capacity of 137 mAh/g after 20 cycles at C/20 and room temperature. At 60°C, all the lithium is removed at the end of the first charge at C/20, with subsequent cycles showing reversible insertion of 1.06 Li-ions when cycled between 1.5 and 4.6 V. The electrochemistry of calcium-ferrite LiFeTiO4 and Li2Fe3SbO8 was investigated in half cells versus lithium and up to 0.63 and 1.35 lithium ions can be reversibly inserted into the structure after 50 cycles at a C/5 rate, respectively. LiFeTiO4 showed good cyclability with no capacity fade observed after the second cycle while Li2Fe3SbO8 exhibited a constant capacity fade with a 60 % capacity retention after the 50th cycle. Doping Li2Fe3SbO8 with tin reduces the capacity. However, the capacity retention is significantly enhanced. For Li2Fe2.5Sb0.5SnO8 after 20 cycles at C/5, the capacity is stable and comparable with that observed for Li2Fe3SbO8 after the same number of cycles. Using ion-exchange procedures has allowed new metastable materials to be obtained which have the potential to be used as cathodes in lithium-ion batteries. Doping these families of materials with different atoms has been shown to improve their electrochemical performance. Ex situ XRD was used to demonstrate that the original structures of LiMnTiO4, LiFeTiO4 and Li2Fe3SbO8 are retained during cycling. The volume change observed for Li2Fe3SbO8 upon delithiation was particularly noteworthy with a small decrease of 0.9 % at the end of charge when cycled at C/100 and room temperature, indicating structural stability upon lithium insertion/de-insertion.
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Nagpure, Suraj R. „SYNTHESIS OF TITANIA THIN FILMS WITH CONTROLLED MESOPORE ORIENTATION: NANOSTRUCTURE FOR ENERGY CONVERSION AND STORAGE“. UKnowledge, 2016. http://uknowledge.uky.edu/cme_etds/67.
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This dissertation addresses the synthesis mechanism of mesoporous titania thin films with 2D Hexagonal Close Packed (HCP) cylindrical nanopores by an evaporation-induced self-assembly (EISA) method with Pluronic surfactants P123 and F127 as structure directing agents, and their applications in photovoltaics and lithium ion batteries. To provide orthogonal alignment of the pores, surface modification of substrates with crosslinked surfactant has been used to provide a chemically neutral surface. GISAXS studies show not only that aging at 4°C facilitates ordered mesostructure development, but also that aging at this temperature helps to provide orthogonal orientation of the cylindrical micelles which assemble into an ordered mesophase directly by a disorder-order transition. These films provide pores with 8-9 nm diameter, which is precisely the structure expected to provide short carrier diffusion length and high hole conductivity required for efficient bulk heterojunction solar cells. In addition, anatase titania is a n-type semiconductor with a band gap of +3.2 eV. Therefore, titania readily absorbs UV light with a wavelength below 387 nm. Because of this, these titania films can be used as window layers with a p-type semiconductor incorporated into the pores and at the top surface of the device to synthesize a photovoltaic cell. The pores provide opportunities to increase the surface area for contact between the two semiconductors, to align a p-type semiconductor at the junction, and to induce quantum confinement effects.
These titania films with hexagonal phase are infiltrated with a hole conducting polymer, poly(3-hexylthiophene) (P3HT), in order to create a p-n junctions for organic-inorganic hybrid solar cells, by spin coating followed by thermal annealing. This assembly is hypothesized to give better photovoltaic performance compared to disordered or bicontinuous cubic nanopore arrangements; confinement in cylindrical nanopores is expected to provide isolated, regioregular “wires” of conjugated polymers with tunable optoelectronic properties, such as improved hole conductivity over that in bicontinuous cubic structure. The kinetics of infiltration into the pores show that maximum infiltration occurs within less than one hour in these films, and give materials with improved photovoltaic performance relative to planar TiO2/P3HT assemblies. These oriented mesoporous titania films are also used to develop an inorganic solar cell by depositing CdTe at the top using the Close Spaced Sublimation (CSS) technique. A power conversion efficiency of 5.53% is measured for heterostructures built using mesoporous titania films, which is significantly enhanced relative to planar TiO2/CdTe devices and prior reports in the literature. These mesoporous titania films have a great potential in inorganic solar cell development and can potentially replace CdS window layers which are conventionally used in inorganic CdS-CdTe solar cells. The last part of the dissertation addresses layer-by-layer synthesis to increase the thickness of mesoporous titania films with vertically oriented 2D-HCP nanopores, and their use in lithium ion batteries as negative electrodes because of advantages such as good cycling stability, small volume expansion (~3%) during intercalation/extraction and high discharge voltage plateau. The high surface area and small wall thickness of these titania films provide excellent lithium ion insertion and reduced Li-ion diffusion length, resulting in stable capacities as high as 200-250 mAh/g over 200 cycles.
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Zhang, Yizhou. „Modularized Battery Management Systems for Lithium-Ion Battery Packs in EVs“. Thesis, KTH, Skolan för elektro- och systemteknik (EES), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-194316.
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The (Battery management system)BMS has the task of ensuring that for the individual bat-tery cell parameters such as the allowed operating voltage window or the allowable temperature range are not violated. Since the battery itself is a highly distinct nonlinear electrochemical de-vice it is hard to detect its internal characteristics directly. The requirement of predicting battery packs’ present operating condition will become one of the most important task for the BMS. Therefore, special algorithms for battery monitoring are required.In this thesis, a model based battery state estimation technique using an adaptive filter tech-nology is investigated. Different battery models are studied in terms of complexity and accuracy. Following up with the introduction of different adaptive filter technology, the implementation of these methods into battery management system is decribed. Evaluations on different estimation methods are implemented from the point of view of the dynamic performance, the requirement on the computing power and the accuracy of the estimation. Real test drive data will be used as a reference to compare the result with the estimation value. Characteristics of different moni-toring methods and models are reported in this work. Finally, the trade-offs between different monitor’s performance and their computational complexity are analyzed.BMS (eng. battery management system) har till uppgift att se till att viktiga parametrar såsom tillspännings- och temperaturintervall upprätthålls för varje individuell battericell. Då en battericells beteende är ickelinjärt är det svårt att bestämma cellens interna karakteristika direkt. Att kunna förutsäga dessa karakteristika för ett komplett batteripack kommer att en mycket viktig funktion hos framtida BMS. I detta examensarbete har en modellbaserad tillståndsestimeringsmetod med användande av adaptiv filtrering undersökts. Olika batterimodeller har studerats med avseende på komplexitet och noggrannhet. Efter introduktionen av olika metoder för adaptiv filtrering har dessa metoder implementerats i en BMS modell. Utvärdering av de olika metoderna för att åstadkomma tillståndsestimering har sedan utförts med avseende på dynamisk prestanda, krav på beräkningskraft och noggrannhet hos de resulterande estimaten. Data från uppmätta kördata från ett fordon har använts som referens för att jämföra de olika estimaten. Slutligen presenteras en jämförelse mellan de olika tillståndsestimeringsmetodernas prestanda när de appliceras på de olika batterimodellerna.
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Demeaux, Julien. „Impact des phénomènes aux interfaces électrode/électrolyte sur les performances des batteries Li-ion haute tension : faiblesses et atouts des électrolytes à base de carbonates d'alkyles et de sulfones face aux électrodes LiNi0,4Mn1,6 O4 et Li4Ti5O12“. Thesis, Tours, 2013. http://www.theses.fr/2013TOUR4032/document.
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Les accumulateurs LiNi0.4Mn1.6O4 (LNMO)/Li4Ti5O12 (LTO), permettent d’atteindre théoriquement les densités de puissance et d’énergie fournissant une autonomie suffisante aux véhicules électriques. Cependant, deux problèmes majeurs liés à LNMO limitent leurs performances : l’oxydation prononcée des électrolytes à base de carbonates d’alkyles et la dissolution d’ions de métaux de transition (Mn2+, Ni2+). Les formulations à base de carbonate d’éthylène (EC) ont une aptitude à former des films polymères couvrant la matière active. Les cyclages galvanostatiques, faisant suite ou non à un stockage, confirment la supériorité de ces électrolytes, conduisant à des pertes de capacité réduites de l’électrode LNMO. D’autre part, les sulfones sont des composés prometteurs pour une utilisation dans les batteries LNMO/LTO. L’emploi de cellules symétriques et asymétriques démontre que les sulfones sont non-réactives vis-à-vis des interfaces LNMO/électrolyte et LTO/électrolyte. Cependant, cette non-réactivité ne permet pas le dépôt de films polymères qui auraient permis de stopper la dissolution d’ions Mn2+ et Ni2+ à partir de l’électrode positive. Ceci résulte en des performances dégradées à 30°C des accumulateurs par rapport à ceux employant EC dans les électrolytesLiNi0.4Mn1.6O4 (LNMO)/Li4Ti5O12 (LTO) accumulators should theoretically achieve the power and energy densities that provide sufficient autonomy to electric vehicles. However, two major issues related to the use of LNMO limit their performances: the pronounced oxidation of the alkylcarbonate-based electrolytes and the transition metal ion (Mn2+, Ni2+) dissolution. The ethylene carbonate (EC)-based formulations get an ability to form polymer-covering films onto the active material. The galvanostatic cycling tests, after storage or not, confirm the superiority of these electrolytes, leading to reduced capacity losses of the LNMO electrode. Furthermore, sulfones are promising compounds to be applied to LNMO/LTO batteries. The use of symmetric and asymmetric cells demonstrates that sulfones are non-reactive towards the LNMO/electrolyte and LTO/electrolyte interfaces. However, this non-reactivity does not allow the deposition of polymer films, which would have enabled to stop the Mn2+ and Ni2+ dissolution from the positive electrode. This results in degraded performances of batteries at 30°C compared to those using EC in electrolytes
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Liiv, Oliver. „Industrialization of Lithium-Ion Prismatic Battery Cell for the Automotive Industry“. Thesis, KTH, Industriell produktion, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-278159.
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Energy systems in every part of the world are experiencing accelerated shifts towards more sustainable solutions which will bring far-reaching changes to our daily lives. These rapid transitions will bring impactful and vital changes to the way we fuel our cars, heat our homes and power our industries in the approaching decades. [1] The automotive sector is in high pace to electrify their cars. The number of electric passengercar sales is expected to increase by more than a factor of 60 between 2018 to 2050. Which means by that time there could be approximately 2 billion EVs on the roads and they all need batteries to run on. [1] ManyEuropean electric vehicle manufacturers have started marketing their future models globally, but automotiveli.-ion battery manufacturing capacity in Europe is merely 2.1% of the total global automotive li-ion batteryproduction. [2] Increase in sales of EV-s and energy storage systems drives the demand for li-ion batteries. This research is conducted in collaboration with Northvolt, one of the newcomers to the li-ion batterymanufacturing market in Europe. Northvolt is a Swedish-founded company in 2016, and despite its young age, Northvolt has prominent partners including BMW Group, Epiroc, Scania and the Volkswagen Group. Northvolt is with global ambition to produce the world's greenest battery cell with minimal possible carbon footprint in its Gigafactory in Sweden with 32GWh annual manufacturing capacity. Also, together with Volkswagen a 50/50 joint venture has been established to produce batteries in a 16GWh factory in Germany. After entering in different supplier agreements, Northvolt has sold a considerable amount of its first Gigafactory NV Ett production capacity to its key customers with a united equivalent of over $13billion until 2030. [3]Setting up lithium-ion battery factories for the automotive industry is a challenging task. It requires high speed and flexibility to keep up with the growing demand in a short time and still meeting all the stakeholder's requirements while keeping the highest environmental standards in place during production. To keep up with the growing demand and customer requirements a state-of.the-art industrialization project management strategy is developed. Therefore, state-of.the-art automotive project management, new product industrialization and development practices are investigated together with the best practices from the wider industry. Furthermore, Northvolt's current industrialization project management strategies are examined, and improvement proposals and tools are developed to ramp-up the current and future factories with shorter time, less cost and highest possible quality. The main aim of the thesis is to develop a project management solutions to lead industrialization of li-ionbattery Giga-factories successfully and help Northvolt fuel our cars, heat our homes, and power our industries more sustainably and innovatively. The expected outcome of the thesis is five tools developed that support the industrialization of LIB production facilities in Europe to increase the EU LIB manufacturing capacity.Energisystem genomgår en snabb omväxling till allt mer hållbara lösningar, vilket kommer påverka våra liv markant. Dessa snabba omväxlingar kommer påverka samt främja sättet hur vi driver våra bilar, värmer våra hus och försörjer våra industrier, flera år framåt. [1] Bilsektorn som har skiftat sitt fokus till elektrifiering av sina bilar, där antalet sålda elbilar förväntas att öka sextifaldigt mellan 2018 och 2050. Detta kommer att leda till att cirka 2 miljarder elbilar kommer att åka på vägarna globalt och alla dessabilar kommer behöva framförallt litiumjonbatterier. [1] Majoriteten av biltillverkare i Europa har börjatutveckla framtida elektrifierade bilmodeller. Tillverkningen av litiumjonbatterier för elbilar i Europa utgörendast 2.1 % av den globala tillverkningen totalt. [2] En ökad försäljning av elbilar och även av produkterför energilagring, ökar efterfrågan på litiumjonbatterier. Den här undersökningen har tagits fram i samarbete med Northvolt som är en av nykomlingarna inomtillverkningen av litiumjonbatterier i Europa. Northvolt är ett svenskt bolag som startades 2016 och trotsdess tidiga fas, har de lyckats samverka med prominenta samarbetspartners som BMW group, Epiroc, Scania och Volkswagen group. Northvolts ambition är att skapa världens grönaste batteri med ett minimalt klimatavtryck. Denna produkt utvecklas i deras så kallade Gigafactory som ligger i Skellefteå och vars årliga produktion uppnår 32 Gwh. Utöver det har Northvolt i samarbete med Volkswagen fått i uppdrag att bygga upp en batterifabrik i Tyskland, vars tillverkningskapacitet kommer att uppnå till 16Gwh årligen. Efter att ha ingått i flera leverantörsavtal har Northvolt sålt en avsevärd mängd av sin produktionskapacitet för den planerade fabriken Gigafactory NV Ett till sina nyckelkunder. Detta motsvarar en investering på 13 miljarder dollar fram till 2030. [3]Att etablera en fabrik som tillverkar litiumjonbatterier för bilindustrin är en utmanande uppgift. Det kräversnabba beslut och flexibilitet för att hålla jämna steg med den växande efterfrågan på batterier av denna typ. Batterierna ska hålla måttet för de krav som kunderna har, och även ska de uppfylla alla internationella standarder för ett miljövänligt batteri.För att kunna upprätthålla den växande efterfrågan och kundkraven utvecklas nya metoder inom projektledning för att effektivisera produktionen. Det allra senaste praxis i projektledning, produktion och produkttillverkning inom bilindustrin analyseras. Dessutom beaktas senaste metoderna och praxis från andra industrier. Vidare kartläggs northvolts nuvarande strategi för deras hantering av produktionsfasen för att föreslå förbättringar och verktyg, som kan effektivisera uppbyggnaden och driften av framtida fabriker. Huvudsyftet med denna avhandling är att utveckla nya metoder inom projektledning för att kunnautveckla produktionsfasen för framtida fabriker som tillverkar litiumjonbatterier. Detta kommer leda tillatt Northvolt kommer vara en del av våra framtida liv genom att hjälpa oss att driva våra fordon, värma våra hem och driva våra fabriker på ett hållbart och effektivt sätt. Det förväntade resultatet i denna avhandling är fem utvecklade verktyg som stödjer utbyggnaden av Litiumjonbatteri fabriker i Europa föratt öka dess totala årliga produktion.
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Mukka, Manoj Kumar. „Simulink® Based Design and Implementation of a Solar Power Based Mobile Charger“. Thesis, University of North Texas, 2016. https://digital.library.unt.edu/ark:/67531/metadc849640/.
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Electrical energy is used at approximately the rate of 15 Terawatts world-wide. Generating this much energy has become a primary concern for all nations. There are many ways of generating energy among which the most commonly used are non-renewable and will extinct much sooner than expected. Very active research is going on both to increase the use of renewable energy sources and to use the available energy with more efficiency. Among these sources, solar energy is being considered as the most abundant and has received high attention. The mobile phone has become one of the basic needs of modern life, with almost every human being having one.Individually a mobile phone consumes little power but collectively this becomes very large. This consideration motivated the research undertaken in this masters thesis.
The objective of this thesis is to design a model for solar power based charging circuits for mobile phone using Simulink(R). This thesis explains a design procedure of solar power based mobile charger circuit using Simulink(R) which includes the models for the photo-voltaic array, maximum power point tracker, pulse width modulator, DC-DC converter and a battery. The first part of the thesis concentrates on electron level behavior of a solar cell, its structure and its electrical model.The second part is to design an array of solar cells to generate the desired output. Finally, the third part is to design a DC-DC converter which can stabilize and provide the required input to the battery with the help of the maximum power point tracker and pulse width modulation. The obtained DC-DC converter is adjustable to meet the requirements of the battery. This design is aimed at charging a lithium ion battery with nominal voltage of 3.7 V, which can be taken as baseline to charge different types of batteries with different nominal voltages.
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Palapati, Naveen kumar reddy, und Naveen kumar reddy Palapati. „Diagnostics and Degradation Investigations of Li-Ion Battery Electrodes using Single Nanowire Electrochemical Cells“. VCU Scholars Compass, 2016. http://scholarscompass.vcu.edu/etd/4475.
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Portable energy storage devices, which drive advanced technological devices, are improving the productivity and quality of our everyday lives. In order to meet the growing needs for energy storage in transportation applications, the current lithium-ion (Li-ion) battery technology requires new electrode materials with performance improvements in multiple aspects: (1) energy and power densities, (2) safety, and (3) performance lifetime. While a number of interesting nanomaterials have been synthesized in recent years with promising performance, accurate capabilities to probe the intrinsic performance of these high-performance materials within a battery environment are lacking. Most studies on electrode nanomaterials have so far used traditional, bulk-scale techniques such as cyclic voltammetry, electrochemical impedance spectroscopy, and Raman spectroscopy. These approaches give an ensemble-average estimation of the electrochemical properties of a battery electrode and does not provide a true indication of the performance that is intrinsic to its material system. Thus, new techniques are essential to understand the changes happening at a single particle level during the operation of a battery. The results from this thesis solve this need and study the electrical, mechanical and size changes that take place in a battery electrode at a single particle level.
Single nanowire lithium cells are built by depositing nanowires in carefully designed device regions of a silicon chip using Dielectrophoresis (DEP). This work has demonstrated the assembly of several NW cathode materials like LiFePO4, pristine and acid-leached α-MnO2, todorokite – MnO2, acid and nonacid-leached Na0.44MnO2. Within these materials, α-MnO2 was chosen as the model material system for electrochemical experiments. Electrochemical lithiation of pristine α-MnO2 was performed inside a glove box. The volume, elasticity and conductivity changes were measured at each state-of-charge (SOC) to understand the performance of the material system. The NW size changes due to lithiation were measured using an Atomic Force Microscope (AFM) in the tapping mode. Electronic conductivity changes as a function of lithiation was also studied in the model α-MnO2 NWs and was found to decrease substantially with lithium loading. In other measurements involving a comparison between the alpha and todorokite phases of this material system, it was observed that the rate capability of these materials is limited not by the electronic but, by the ionic conductivity.
Mechanical degradation of a battery cathode represents an important failure mode, which results in an irreversible loss of capacity with cycling. To analyze and understand these degradation mechanisms, this thesis has tested the evolution of nanomechanical properties of a battery cathode. Specifically, contact-mode AFM measurements have focused on the SOC-dependent changes in the Young’s modulus and fracture strength of an α-MnO2 NW electrode, which are critical parameters that determine its mechanical stability. These changes have been studied at the end of the first discharge step, 1 full electrochemical cycle, and 20 cycles. The observations show an increase in Young’s modulus at low concentrations of lithium loading and this is attributed to the formation of new Li-O bonds within the tunnel-structured cathode. As the lithium loading increases further, the Young’s modulus was observed to reduce and this is hypothesized to occur due to the distortions of the crystal at high lithium concentrations. The experimental-to-theoretical fracture strength ratio, which points to the defect density in the crystal at a given stoichiometry, was observed to reduce with electrochemical lithium insertion / cycling. This capability has demonstrated lithiation-dependent mechanical property measurements for the first time and represents an important contribution since degradation models, which are currently in use for materials at any size scale, always assume constant values regardless of the change in stoichiometry.
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Willgård, Carl. „Cylindriska litiumjonbatterier – koncept för kommersiella fordon“. Thesis, KTH, Skolan för kemi, bioteknologi och hälsa (CBH), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-231521.
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I processen att optimera och elektrifiera fordon som använder sig utav batterier har litiumjon battericeller introducerats till fordonen. Det vanligaste sättet är att tillverkaren installerar en stor battericell (> 10 Ah) i fordonen. En stor cell har många fördelar mot en liten cell, som att den är lättare att hantera, den utrustning som krävs för att övervaka cellen blir mindre och det krävs inga kopplingar mellan flertal celler. Det finns däremot en mängd fördelar med att ha mindre celler (< 5 Ah). De mindre cellerna skulle kunna bidra till en lägre kostnad, en jämnare värmefördelning över systemet och framförallt lättare att mekaniskt installera fordonet. Det vanligaste är att företag använder sig utav de större cellerna, det finns däremot fåtal exempel i privata fordonssektorn där tillverkare använder sig utav de mindre cellerna. Att använda sig utav de mindre cellerna kräver ett annat tänk när det gäller kylning, paketering i fordonen samt bevakningen av cellernas hårdvara och mjukvara blir annorlunda. Detta projekt har fokuserat på de elektriska och termiska aspekterna för implementering av parallellt kopplade små litiumjonceller i tunga fordon, som bussar och lastbilar. I projektet utfördes prestandaprov där temperatur, spänning och ström monitorerades över cellerna. Syftet var att öka kunskapen inom området för dessa små celler för att se om dessa har en potentiell plats på den kommersiella marknaden i framtiden. Målet med detta projekt är att mäta den spridning av ström som sker mellan de parallellt kopplade cellerna under variering av temperatur mellan cellerna. Från de utförda experimenten syns det tydligt att det sker en spridning av strömmen mellan cellerna. Den temperaturskillnaden som testas under experimentet påverkar inte strömmens spridning tillräckligt för att det ska visa någon differens i strömspridningen mellan cellerna. Detta ledde till att slutsatsen för projektet blir att det sker en strömspridning mellan parallellt kopplade celler, men temperaturdifferensen på tio grader celsius är inte tillräcklig för att påverka cellerna så pass att spridningen blir större. Under projektets gång möttes vi av många utmaningar och svårigheter. Detta har gjorde att den tid som kunde spenderas på provfasen blev väldigt kort. Det ufördes därför en minimal mängd av prov, vilket betyder att den data som samlades in under projektet inte var lika omfattande som det från början önskats.In the process of optimizing and electrifying vehicles using batteries, lithium-ion battery cells have been introduced to the vehicles. The most common way is that the manufacturer installs a large battery cell (> 10 Ah) in the vehicles. A large cell has many advantages to a small cell. For example it is easier to handle, the equipment required to monitor the cell becomes smaller and no connections between multiple cells are required. On the other hand, there are many advantages of having smaller cells (<5 Ah). The smaller cells could contribute to a lower cost, a more even heat distribution across the system and, above all, easier to mechanically install in the vehicle. The most common choice for companies is to use the larger cells, but there are few examples in the private vehicle sector where manufacturers use the smaller cells. Using the smaller cells requires a different idea when it comes to cooling the cells, packing in the vehicles, and monitoring the hardware and software of the cells are different. This project focused on the electrical and thermal aspects of implementing parallel-connected small lithium-ion cells in heavy vehicles, such as buses and lorries. In this project performance tests were performed where temperature, voltage and current are monitored across the cells. The aim was to increase knowledge in the area of these small cells, to see if they have a potential place in the commercial market in the future. The goal of this project was to measure the spread of current that occurs between the parallel-connected cells during the varying temperature between the cells. From the experiments carried out, it was clear that there’s a spread of the current between the cells. The temperature difference tested during the experiment does not affect the spread of the current enough to show any difference in the current spread between the cells. Which leads to the conclusion of the project that there are a current spread between parallelconnected cells. However, the temperature difference of ten degrees Celsius is not sufficient to affect the cells enough that the spread becomes larger. The project faced a lot of challenges and difficulties. This has meant that the time spent on the experimental phase became very short. Therefore, a minimal amount of experiments was completed, which in turn means that the data collected for the project is not as extensive as it was meant to be initially.
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Liu, Cheng. „In situ infrared study on interfacial electrochemistry in energy storage devices“. University of Akron / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=akron1598305190634383.
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Muneeb, Ur Rehman Muhammad. „Modular, Scalable Battery Systems with Integrated Cell Balancing and DC Bus Power Processing“. DigitalCommons@USU, 2018. https://digitalcommons.usu.edu/etd/6999.
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Traditional electric vehicle and stationary battery systems use series-connected battery packs that employ centralized battery management and power processing architecture. Though, these systems meet the basic safety and power requirements with a simple hard- ware structure, the approach results in a battery pack that is energy and power limited by weak cells throughout life and most importantly at end-of-life. The applications of battery systems can benefit significantly from modular, scalable battery systems capable of advanced cell balancing, efficient power processing, and cost gains via reuse beyond first-use application. The design of modular battery systems has unique requirements for the power electronics designer, including architecture, design, modeling and control of power processing converters, and battery balancing methods. This dissertation considers the requirements imposed by electric vehicle and stationary applications and presents design and control of modular battery systems to overcome challenges associated with conventional systems. The modular battery system uses cell or substring-level power converters to combine battery balancing and power processing functionality and opens the door to new opportunities for advanced cell balancing methods. This approach enables balancing control to act on cell-level information, reroute power around weaker cells in a string of cells to optimally deploy the stored energy, and achieve performance gains throughout the life of the battery pack. With this approach, the integrated balancing power converters can achieve system cost and efficiency gains by replacing or eliminating some of the conventional components inside battery systems such as passive balancing circuits and high-voltage, high-power converters. In addition, when coupled with life prognostic based cell balancing control, the modular system can extend the lifetime of a battery pack by up to 40%. The modular architecture design and control concepts developed in this dissertation can be applied to designs of large battery packs and improve battery pack performance, lifetime, size, and cost.
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Macaraig, Lea Cristina De Jesus. „Studies on Surface Modified Metal Oxides Nanofibers and Thin Films for Solar Energy Conversion and Storage“. Kyoto University, 2013. http://hdl.handle.net/2433/180445.
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Ali, Haider Adel Ali, und Ziad Namir Abdeljawad. „THERMAL MANAGEMENT TECHNOLOGIES OF LITHIUM-ION BATTERIES APPLIED FOR STATIONARY ENERGY STORAGE SYSTEMS : Investigation on the thermal behavior of Lithium-ion batteries“. Thesis, Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-48904.
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Batteries are promising sources of green and sustainable energy that have been widely used in various applications. Lithium-ion batteries (LIBs) have an important role in the energy storage sector due to its high specific energy and energy density relative to other rechargeable batteries. The main challenges for keeping the LIBs to work under safe conditions, and at high performance are strongly related to the battery thermal management. In this study, a critical literature review is first carried out to present the technology development status of the battery thermal management system (BTMS) based on air and liquid cooling for the application of battery energy storage systems (BESS). It was found that more attention has paid to the BTMS for electrical vehicle (EV) applications than for stationary BESS. Even though the active forced air cooling is the most commonly used method for stationary BESS, limited technical information is available. Liquid cooling has widely been used in EV applications with different system configurations and cooling patterns; nevertheless, the application for BESS is hard to find in literature.To ensure and analyze the performance of air and liquid cooling system, a battery and thermal model developed to be used for modeling of BTMS. The models are based on the car company BMW EV battery pack, which using Nickel Manganese Cobalt Oxide (NMC) prismatic lithium-ion cell. Both air and liquid cooling have been studied to evaluate the thermal performance of LIBs under the two cooling systems.According to the result, the air and liquid cooling are capable of maintaining BESS under safe operation conditions, but with considering some limits. The air-cooling is more suitable for low surrounding temperature or at low charging/discharge rate (C-rate), while liquid cooling enables BESS to operate at higher C-rates and higher surrounding temperatures. However, the requirement on the maximum temperature difference within a cell will limits the application of liquid cooling in some discharge cases at high C-rate. Finally, this work suggests that specific attention should be paid to the pack design. The design of the BMW pack is compact, which makes the air-cooling performance less efficient because of the air circulation inside the pack is low and liquid cooling is more suitable for this type of compact battery pack.
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MALTSEV, TIMOFEY. „Thermal behaviour of Li-ion cell : Master Thesis project at Volvo GTT ATR“. Thesis, KTH, Maskinkonstruktion (Inst.), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-142488.
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Examensarbetet gjordes på Volvo Group Trucks Technology. Målet med arbetet var att studeravärmeutveckling i Li-jon cell för hybrid- och elbilar, HEV och EV. Battericeller undersöktesunder sina normala arbetsförhållanden och vid förstörande prov. Undersökningen baserades påcellernas yttemperatur. Arbetet beskrev cellernas beteende och syftade att vara ett underlag förkonstruktörer av batterisystem.En litteraturstudie gjordes för att studera faktorer som påverkar värmeutvecklingen. Sedananalyserades källor till samtliga faktorer. En moduleringsmetod för analys av cellensvärmeeffektivitet togs fram. Miljöpåverkan och ekonomiska aspekter av batterier undersöktes.Tre tester togs fram för att undersöka värmeutvecklingsfaktorer på fem celler. De flestafaktorerna var externa såsom laddning och urladdning, puls och kontinuerlig ström ochomgivningstemperatur. En infraröd kamera användes vid experimenten.Testerna visade hur olika faktorer påverkade cellernas temperatur. Vidare analys av källor visadekritiska områden i cellernas konstruktion.Förstörande värmeprov gjordes på tre par av celler. Dessa värmdes upp till 300°C vilketorsakade ”thermal runaway”. I vissa fall gick temperaturen över 600°C och celler fattade eld.Olika kemiska sammansättningar och uppbyggnad av cellerna gjorde att de betedde sig olika vidgenomförda tester.Testerna visade att olika celler presterade olika vid liknande testförhållanden. Därför är detviktigt att ta fram specifikationer för användningsförhållanden för att välja ut en cell för ettbatterisystem. Sedan kan prestandan av olika celler jämföras och effektivitet kan utvärderas församma belastningscyklar.Thermal Management System kan förhöja batteriets effektivitet och måste designas medanvändningsförhållanden i åtanke. Batteriernas säkerhet är väldigt viktig och människor får inteskadas av batterier. Därför måste säkerheten finnas i åtanke i alla steg av batteridesign.Arbetets resultat blev en sammanfattning av viktiga faktorer och specifikationer för batteridesignsom baserades på värmeutvecklingen. Samtliga riktlinjer sammanfattades i Appendix 5.Master thesis work was done at Volvo Group Trucks Technology. Aim of the project was tostudy thermal behaviour of Li-ion battery for hybrid and electric vehicles, HEVs and EVs.Battery cells were tested in regular working conditions and abuse conditions. Surfacetemperature of cells was chosen for studying heat evolution.A literature study was conducted to research factors that influence cell temperature. Analysis ofsources of these factors was then performed. A modelling method for analyzing cell thermalefficiency was designed. Sustainability and economics aspects of batteries were also studied.When factors were established three tests were designed to study their effects. Five cells werestudied. Tests mainly examined external factors such as charge and discharge, pulse andcontinuous current, ambient temperature to name a few. An infrared camera was used.Study showed how different factors influenced cell temperature. Further analysis of sourcespointed out some hot spots of cell designs.Thermal abuse test were performed on three pairs of cells. Cells were heated up to 300°C andwent through thermal runaway which in some cases increased temperatures up to 660°C in lessthan a second and caused fire. Different cell chemistries and cell designs reacted differently tothe abuse conditions.A conclusion was reached that cells performed differently in similar test conditions. Whendesigning a battery system a set of specifications for usage conditions is crucial for choosing acell. When conditions and load cycles are known cells can be tested and their thermal andelectrical efficiency evaluated.Thermal Management System TMS can largely enhance cell efficiency and lifecycle. Suchsystem must also be designed according to usage conditions and particular cell’s performance.Battery safety showed to be a very important factor of designing a battery system. Humans shallnot be injured by systems with batteries which must be kept in mind during design.Work resulted in summary of important factors and specifications for designing a battery systembased on cell thermal behaviour. These guidelines are presented in Appendix 5.
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Patranika, Tamara. „Investigations of the Thermal Runaway Process of a Fluorine-Free Electrolyte Li-Ion Battery Cell“. Thesis, KTH, Kemiteknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-298355.
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Detta projekt syftar till att undersöka den termiska rusningsprocessen hos ett litiumjonbatteri med en fluorfri elektrolyt och jämföra den med en kommersiellt använd fluor-innehållande elektrolyt. Battericellerna innehöll silikon-grafit som anod och LiNi0.6Mn0.2Co0.2O2 (NMC622) som katod. Den fluorfria elektrolyten var baserad på litium bis(oxalato)borat (LiBOB) i organisk lösning med additivet vinylen karbonat(VC). Det jämfördes med en fluor-innehållande elektrolyt med LiPF6 i samma organiska lösning tillsammans med VC och fluoroetylene karbonat (FEC). De termiska stabilitetstesterna utfördes med Accelerating Rate Calorimetry (ARC) och Differentiell svepkalorimetri (DSC). Både knappceller och pouchceller har undersökts med hjälp av ARC. Trots flera försök med olika uppställning kunde den termiska rusningen inte bli detekterad för någon av celltyperna, med slutsatsen att en störremängd aktivt material behövs. Istället användes DSC för att undersöka de termiska reaktionerna hos batteri-komponenterna. Resultaten visade att anoden var mer termisk stabil med den fluorfria elektolyten, medan samma elektrolyt visade mindre termisk stabilitet på katoden. Vidare undersökningar behövs dock för bekräftelse av katoden.This project aims to investigate the thermal runaway process of fluorine-free lithium ion battery cells and to compare this with a commercially used fluorinated electrolyte. The cells consisted of a silicon-graphite composite anode and a LiNi0.6Mn0.2Co0.2O2(NMC622) cathode. The non-fluorinated electrolyte used was based on lithiumbis(oxalato)borate (LiBOB) in organic solvents with the additive vinylene carbonate(VC). Moreover, the fluorinated electrolyte consisted of LiPF6 in the same organic solvents together with VC and fluoroethylene carbonate (FEC). The thermal stability measurements have included Accelerating Rate Calorimetry (ARC) and Differential Scanning Calorimetry (DSC). Moreover, both coin cells and pouch cells have been examined by ARC. However, thermal runaway could not be detected for either type of cells, concluding that a greater amount of active material was needed. In order to measure the thermal reactions of the battery components, DSC was used. These results concluded that the anode was more thermally stable with a non-fluorinated electrolyte. However, the thermal stability appeared to be lower for the cathode, therefore, further investigation is needed for confirmation of the cathode.
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Feng, Chenrun. „Physical and electrochemical investigation of various dinitrile plasticizers in highly conductive polymer electrolyte membranes for lithium ion battery application“. University of Akron / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1495737492563488.
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Mellgren, Niklas. „Validated Modelling of Electrochemical Energy Storage Devices“. Licentiate thesis, KTH, Mechanics, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-11052.
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This thesis aims at formulating and validating models for electrochemical energy storage devices. More specifically, the devices under consideration are lithium ion batteries and polymer electrolyte fuel cells.
A model is formulated to describe an experimental cell setup consisting of a LixNi0.8Co0.15Al0.05O2 composite porous electrode with three porous separators and a reference electrode between a current collector and a pure Li planar electrode. The purpose of the study being the identification of possible degradation mechanisms in the cell, the model contains contact resistances between the electronic conductor and the intercalation particles of the porous electrode and between the current collector and the porous electrode. On the basis of this model formulation, an analytical solution is derived for the impedances between each pair of electrodes in the cell. The impedance formulation is used to analyse experimental data obtained for fresh and aged LixNi0.8Co0.15Al0.05O2 composite porous electrodes. Ageing scenarios are formulated based on experimental observations and related published electrochemical and material characterisation studies. A hybrid genetic optimisation technique is used to simultaneously fit the model to the impedance spectra of the fresh, and subsequently also to the aged, electrode at three states of charge. The parameter fitting results in good representations of the experimental impedance spectra by the fitted ones, with the fitted parameter values comparing well to literature values and supporting the assumed ageing scenario.
Furthermore, a steady state model for a polymer electrolyte fuel cell is studied under idealised conditions. The cell is assumed to be fed with reactant gases at sufficiently high stoichiometric rates to ensure uniform conditions everywhere in the flow fields such that only the physical phenomena in the porous backings, the porous electrodes and the polymer electrolyte membrane need to be considered. Emphasis is put on how spatially resolved porous electrodes and nonequilibrium water transport across the interface between the gas phase and the ionic conductor affect the model results for the performance of the cell. The future use of the model in higher dimensions and necessary steps towards its validation are briefly discussed.
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Geder, Jan [Verfasser], Andreas [Akademischer Betreuer] Jossen, Andreas [Gutachter] Jossen und Jürgen [Gutachter] Garche. „Role of active material composition and microstructure in lithium-ion battery cell safety / Jan Geder ; Gutachter: Andreas Jossen, Jürgen Garche ; Betreuer: Andreas Jossen“. München : Universitätsbibliothek der TU München, 2021. http://d-nb.info/123781586X/34.
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Mostafaee, Mani. „Six Sigma for quality assurance of Lithium-ion batteries in the cell assembly process : A DMAIC field study at Northvolt“. Thesis, Luleå tekniska universitet, Institutionen för ekonomi, teknik, konst och samhälle, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-85966.
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Lack of technical cleanliness and particle contaminations in Lithium-ion battery manufacturing affect the performance of batteries which are a risk for the safety and quality of the product. Therefore, part of the manufacturing process occurs inside the Clean and Dry room area to maintain technical cleanliness. This paper aims to provide a framework to control particle contamination inside the Clean and Dry room and strengthen the product's quality and safety. A literature study was conducted, which was completed by a field study at Northvolt Labs in Västerås to achieve the study's aims. The study contributes to existing theories by providing a framework to find root causes of particle contamination in the manufacturing process based on the existing literature and standards. The Six Sigma problem-solving methodology DMAIC was implemented to conduct the field study. A risk assessment was conducted to find the possible threats toward technical cleanliness in the cell assembly process. The risk sources were identified by implementing measurement methods from relevant standards. The results indicate a high risk for technical cleanliness are coming from the decontamination method, material, machines, and environment. Furthermore, several recommendations were given that are expected to decrease the amount of nonconformity in the process.Brist på teknisk renhet och partikelföroreningar vid tillverkning av litiumjonbatterier påverkar dess prestanda och utgör en risk för produktens säkerhet och kvalitet. Därför sker en del av tillverkningsprocessen i ett Clean & Dry rum för att upprätthålla teknisk renhet. Denna uppsats syftar till att ge ett ramverk för att kontrollera partikelföroreningar och därmed stärka produktens kvalitet och säkerhet. För att uppnå syftet genomfördes först en litteraturstudie vilket vidare kompletterades med en fältstudie vid Northvolt Labs i Västerås. Studien bidrar till befintliga teorier genom att tillhandahålla ett ramverk för att hitta och åtgärda rotorsaker till partikelkontaminering i tillverkningsprocessen baserat på befintlig litteratur och standarder. Sex Sigma problemlösningsmetoden DMAIC implementerades för att genomföra fältstudien. En riskbedömning genomfördes för att hitta riskfyllda aktiviteter i processen. Vidare implementerades mätmetoder från relevanta standarder för att mäta kontamineringsnivån. Resultaten indikerar stor risk för tekniskrenhet från saneringsmetoder, material, maskiner och miljön. Vidare rekommenderas flera åtgärder för att underhålla tekniskrenhet vilka förväntas minska avvikelser i processen.
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Birkholz, Oleg [Verfasser], und M. [Akademischer Betreuer] Kamlah. „Modeling transport properties and electrochemical performance of hierarchically structured lithium-ion battery cathodes using resistor networks and mathematical half-cell models / Oleg Birkholz ; Betreuer: M. Kamlah“. Karlsruhe : KIT-Bibliothek, 2021. http://d-nb.info/123814814X/34.
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Cordoba, Arenas Andrea Carolina. „Aging Propagation Modeling and State-of-Health Assessment in Advanced Battery Systems“. The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1385967836.
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Leclere, Mélody. „Synthèse de (poly)électrolytes pour accumulateur Li-ion à haute densité d'énergie“. Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEI001/document.
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Les travaux de thèse présentés dans ce manuscrit portent sur le développement nouveaux électrolytes sans recours aux solvants conventionnels inflammables afin de répondre à la problématique de sécurité des batteries. La première partie de ce travail vise à développer des électrolytes gélifiés à partir de liquide ionique phosphonium. Une étude est réalisée sur la compatibilité entre l'électrolyte et le polymère hôte époxy/amine ainsi que de l'influence du LI sur la polymérisation du réseau. Les propriétés thermiques, viscoélastiques et de transport ionique des gels sont discutées. Parmi les électrolytes gélifiés obtenus, le gel contenant l'électrolyte (1 M LiTFSI + LI [P66614][TFSI]) a montré des propriétés électrochimiques intéressantes. Un système gélifié Li|LFP a été mis en œuvre et une bonne stabilité en cyclage à 100 °C a été obtenue. La deuxième partie de ce travail consiste au développement de nouveaux électrolytes mésomorphes favorisant un transport d’ions lithium par saut. Un composé anionique a été synthétisé à partir d’une réaction époxy/amine entre le 4-amino-1-naphtalènesulfonate de lithium et un diglycidylether aliphatique. Différentes techniques de caractérisation ont été utilisées afin d’établir un lien structure/propriétés. Les résultats ont permis de mettre en évidence une organisation supramoléculaire lamellaire permettant d’obtenir des canaux de conduction d’ions lithium. Les mesures de transport ionique ont permis de mettre en évidence un transport d'ions lithium suivant une loi d'Arrhenius (indépendant du squelette moléculaire) ce qui est la preuve d'un mécanisme de transport d'ions lithium par saut. Les premiers tests électrochimiques ont révélé une bonne stabilité de ces électrolytes vis à vis du lithium et un transport d’ions lithium réversible dans une cellule symétrique Li|Li. A l'issue de ces travaux, les perspectives sont discutées afin d'améliorer les performances de ces électrolytesThe thesis work presented in this manuscript focuses on the development of new electrolytes without the use of flammable conventional solvents to improve the security problem batteries. The first part of this work is the preparation of gelled electrolytes from phosphonium ionic liquid. A study is performed on the compatibility between the electrolyte and the polymer host epoxy / amine as well as the influence of the polymerization LI on the network. The thermal properties, and ionic transport viscoelastic gels are discussed. Among the obtained gelled electrolyte, the gel containing the electrolyte (1 M LiTFSI + LI [P66614] [TFSI]) showed interesting electrochemical properties. A gelled system Li | LFP has been implemented and good cycling stability at 100 ° C was obtained. The second part of this work is the development of new liquid crystal electrolytes promotes transport of lithium ions with hopping mechanism. An anionic compound was synthesized from reaction of an epoxy / amine from lithium 4-amino-1-naphthalenesulfonate and an aliphatic diglycidyl ether. Various characterization technical were used to establish a link structure / properties. The results allowed to show a lamellar supramolecular organization to obtain lithium ion conduction channels. The ion transport measurement helped to highlight a transport of lithium ions following an Arrhenius law (independent of the molecular backbone) which is evidence of a transport mechanism of lithium ions with hopping mechanism. The first electrochemical tests showed good stability of these electrolytes with lithium electrode and a reversible lithium ion transport in a symmetrical cell Li | Li. Following this work, the prospects are discussed to improve the performance of these electrolytes