Dissertations / Theses on the topic 'Battery separators'
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Lin, Jialu. "The continuous co-extrusion of fibrous films for application in battery separators." Case Western Reserve University School of Graduate Studies / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=case1522858264345226.
Full textEscalante, García Ismailia Leilani. "Fundamental and Flow Battery Studies for Non-Aqueous Redox Systems." Case Western Reserve University School of Graduate Studies / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=case1425046485.
Full textXu, Zhi. "Investigations on Molecular Sieve Zeolite Membranes as Proton-Selective Ion Separators for Redox Flow Batteries." University of Cincinnati / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1428049733.
Full textMichos, Ioannis. "Studies on Ion Transport in Mesoporous and Microporous Inorganic Membranes as Ion Separators for Redox Flow Batteries." University of Cincinnati / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ucin149155938977993.
Full textToquet, Fabien. "Study of the combined roles of the Silica/Oil/UHMWPE formulation and process parameters on morphological and electrical properties of battery Separators." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSE1014/document.
Full textThis work is devoted to understand the effect of the formulation and more specifically of the precipitated silica on the resistivity of the PE-separators. The PE-separators are designed for the lead-acid batteries. PE-separators are composed of precipitated silica, ultrahigh molecular weight polyethylene (UHMW-PE) and organic oil. The first part of this work was to elaborate PE-separator models at a laboratory scale. Then, the factors impacting the structural and physico-chemicals properties of PE-separators were investigated. These factors are mainly the amounts of oil, precipitated silica, the grade of the precipitated silica, the temperature conditions of crystallization and the device used to elaborate the membrane. The influence of the amounts of oil and precipitated silica on the crystallization of the polyethylene wasthoroughly described showing that the oil helps to increase the final crystallinity of UHMWPE and that the silica plays a role of oil reservoir. Moreover, it was shown that the amount and the grade of precipitated silica have an influence on the wettable part of the porosity of the PE-separators. The coating of the pores by the precipitated silica is responsible of the wettability of the membranes by the electrolyte. Thus, an empirical parameter has been proposed in order to quantify the efficiency of the dispersion and distribution of the precipitated silica in the membrane. The more the membranes are wettable by the electrolyte the more the resistivity of the membranes is decreased. To finish, for a same amount of components and a same method of processing, it is possible to discriminate the efficiency of each grade of precipitated silica for the battery separator application
Keaswejjareansuk, Wisawat. "Electrospun Separator for Structural Battery Applications." Digital WPI, 2019. https://digitalcommons.wpi.edu/etd-dissertations/521.
Full textZhang, Xiaowei Ph D. Massachusetts Institute of Technology. "Mechanical behavior of shell casing and separator of lithium-ion battery." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/111745.
Full textCataloged from PDF version of thesis.
Includes bibliographical references (pages 135-143).
With the rapid growth of electric vehicle (EV) market, the mechanical safety of lithium-ion batteries has become a critical concern for car and battery manufacturers as well as the public. Lithium-ion battery cells consist of cathode, anode, separator and shell casing or aluminum plastic cover. Among them, the shell casing provides substantial strength and fracture resistance under mechanical loading, and the failure of the separator determines onset of internal short circuit of the cell. In the first part of this thesis, a plasticity and fracture model of the battery shell casing by taking the anisotropic plasticity and stress-state dependent fracture into account was developed. The shell casing model is calibrated and validated at both specimen and component levels. This shell casing model, together with homogenized jellyroll model could predict mechanical behavior of single cylindrical 18650 cell well and could serve for battery pack crash simulation purposes. Another part of this thesis is mechanical test, characterization and modeling of battery separators since the mechanical properties of separators are crucial to internal shorts of lithium-ion batteries. Mechanical properties of commercially available four typical separators that including polypropylene (PP), trilayer (PP-PE-PP), ceramic-coated and nonwoven separators were compared, such as in-plane tensile strength, out-of-plane compression strength and puncture strength. Two distinct failure modes of dry-processed separators under biaxial loading were observed in the tests and used to explain the differences in short circuit characteristics of same cells. A conservative defection-based failure criterion for predicting of onset of short from experimental data was proposed. Numerical model of separator was developed and it succeeded in predicting the response of PP separator under biaxial loading. Owing to the micro porous semi-crystalline nature of widely used PP separator, interrupted tests of PP separator under different in-plane tension including machine direction, transverse direction and diagonal direction were conducted in order to reveal deformation mechanism at the micrometer level. Through scanning electric microscopy (SEM) observation and X-ray diffraction of deformed regions from interrupted test specimens, deformation sequences of micro fibrils and lamellae blocks of PP separator are reported. Lastly, significant mechanical degradation of separator due to charge-discharge cycling was described.
by Xiaowei Zhang.
Ph. D.
Erikson, Pontus. "The Interaction of Oil and Polymer in the Microporous Polyethylene Film when using a Thermally Induced Phase Separation Process." Thesis, KTH, Skolan för kemi, bioteknologi och hälsa (CBH), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-266155.
Full textBatteri separatorn är en komponent i det konventionella batteriet som länge har förbisetts. Bara för att den är en inaktiv komponent, betyder inte att den är mindre viktig för battericellens prestation. Trender idag pekar mot en enorm tillväxt inom elbils-industrin, och med det även litium-jon batteriseparatorns marknad. Det är för att litium-jon batteriet är det batteriet som vanligen används kommersiellt idag i elbilar. I en av de två stora industriella tillverkningsprocesserna används olja för att åstadkomma en porös film. Denna studie syftar på att utvärdera olika oljors interaktion med polymeren i denna tillverkningsprocess. Eftersom de flesta batteriseparator-industrier idag använder paraffinrik olja så testas oljor med olika mycket naftalensikt innehåll för att hitta korrelationer mellan oljornas egenskaper och kristalliniteten eller porositeten hos filmerna. Inga korrelationer för porositeten eller kristalliniteten kunde göras till oljornas egenskaper. Bilderna tagna med SEM var ej tillräckligt förstorade för att kunna studera vare sig porstorleken eller porstrukturen hos filmerna. För framtida studier rekommenderas att samla in mer data för att kunna utskilja ”outliers” i datan, för att erhålla mer korrekta värden. Metodiken måste även verifieras för att säkerställa att proceduren är reproducerbar. För att studera porerna och porstrukturen, borde en FE-SEM användas för att få mer förstorade bilder med bättre kvalité på filmernas yta.
Řehák, Petr. "Studium vlivu modifikace separátorů na vlastnosti Li-S akumulátorů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2021. http://www.nusl.cz/ntk/nusl-442444.
Full textKnoche, Thomas [Verfasser], and Mathias [Akademischer Betreuer] Ulbricht. "Novel porous membranes with enhanced stability as lithium ion battery separator / Thomas Knoche ; Betreuer: Mathias Ulbricht." Duisburg, 2016. http://d-nb.info/1120923468/34.
Full textYang, Ruidong. "Studies on Molecular and Ion Transport in Silicalite Membranes andApplications as Ion Separator for Redox Flow Battery." University of Cincinnati / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1406820402.
Full textGu, Yu. "A PVDF-BASED HYBRID ELECTROLYTE INCORPORATING LATP AND Al2O3 FILLERS WITH ENHANCED IONIC CONDUCTIVITY AND THERMAL STABILITY FOR LI-ION BATTERIES." Case Western Reserve University School of Graduate Studies / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=case1618903524872759.
Full textYazdani, Aliakbar. "Novel Approach to Design, Optimization, and Application of Thermal Batteries and Beyond." Ohio University / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1617360759548812.
Full textPléha, David. "Nanovlákenné separátory pro lithium-iontové akumulátory." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2018. http://www.nusl.cz/ntk/nusl-371155.
Full textLi, Yajie. "Design, Fabrication and Application of Polymeric Porous Media." Thesis, Paris, ENSAM, 2018. http://www.theses.fr/2018ENAM0009/document.
Full textDue to the combination of the advantages of porous media and polymer materials, polymeric porous media possess the properties of controllable porous structure, easily modifiable surface properties, good chemical stability, etc., which make them applicable in a wide range of industrial fields, including adsorption, battery separator, catalyst carrier, filter, energy storage, etc. Although there exist various preparation methods, such as template technique, emulsion method, phase separation method, foaming process, electrospinning, top-down lithographic techniques, breath figure method, etc., the large-scale preparation of polymeric porous media with controllable pore structures and specified functions is still a long-term goal in this field, which is one of the core objectives of this thesis. Therefore, in the first part of the thesis, polymeric porous media are firstly designed based on the specific application requirements. Then the designed polymeric porous media are prepared by the combination of multilayer coextrusion and traditional preparation methods (template technique, phase separation method). This combined preparation method has integrated the advantages of the multilayer coextrusion (continuous process, economic pathway for large-scale fabrication, flexibility of the polymer species, and tunable layer structures) and the template/phase separation method (simple preparation process and tunable pore structure). Afterwards, the applications of the polymeric porous media in polycyclic aromatic hydrocarbons adsorption and lithium-ion battery separator have been investigated.More importantly, in the second part of the thesis, numerical simulations of particle transport and deposition in porous media are carried out to explore the mechanisms that form the theoretical basis for the above applications (adsorption, separation, etc.). Transport and deposition of colloidal particles in porous media are of vital important in other applications such as aquifer remediation, fouling of surfaces, and therapeutic drug delivery. Therefore, it is quite worthy to have a thorough understanding of these processes as well as the dominant mechanisms involved. In this part, the microscale simulations of colloidal particle transport and deposition in porous media are achieved by a novel colloidal particle tracking model, called 3D-PTPO (Three-Dimensional Particle Tracking model by Python® and OpenFOAM®) code. The particles are considered as a mass point during transport in the flow and their volume is reconstructed when they are deposited. The main feature of the code is to take into account the modification of the pore structure and thus the flow streamlines due to deposit. Numerical simulations were firstly carried out in a capillary tube considered as an element of an idealized porous medium composed of capillaries of circular cross sections to revisit the work of Lopez and co-authors by considering a more realistic 3D geometry and also to get the most relevant quantities by capturing the physics underlying the process. Then microscale simulation is approached by representing the elementary pore structure as a capillary tube with converging/diverging geometries (tapered pipe and venturi tube) to explore the influence of the pore geometry and the particle Péclet number (Pe) on particle deposition. Finally, the coupled effects of surface chemical heterogeneity and hydrodynamics on particle deposition in porous media were investigated in a three-dimensional capillary with periodically repeating chemically heterogeneous surfaces
Bilko, Radek. "Příčiny předčasné ztráty kapacity olověných akumulátorů pracujících v PSoC režimu hybridních elektrických vozidel." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-233669.
Full textPospíchal, Martin. "Vliv přítlaku na životnost olověných akumulátorů u hybridních elektrických vozidel." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-219878.
Full textVilhelm, Ondřej. "Kompozitní elektrodové materiály pro lithium-iontové akumulátory na bázi LiFePO4." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219028.
Full textJohansen, Jonathan Frederick. "Mathematical modelling of primary alkaline batteries." Thesis, Queensland University of Technology, 2007. https://eprints.qut.edu.au/16412/1/Jonathan_Johansen_Thesis.pdf.
Full textJohansen, Jonathan Frederick. "Mathematical modelling of primary alkaline batteries." Queensland University of Technology, 2007. http://eprints.qut.edu.au/16412/.
Full textGuo, Dong. "LITHIUM-SULFUR BATTERY DESIGN: CATHODES, SEPARATORS, AND LITHIUM METAL ANODES." Diss., 2021. http://hdl.handle.net/10754/669135.
Full textHsueh-TeHsu and 徐學德. "Fluoropolymer-Based Separator: Preparation, Characterization and Performance in Battery Devices." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/v9abus.
Full text國立成功大學
化學工程學系
106
We utilized the fluoro-based polymer, PVdF-co-HFP to prepare the separators for ion batteries by casting-film and electrospinning membrane. In the part of casting-film, we tried to mix the PVdF-co-HFP and ionic liquid with different ratios. According to the SEM analysis, it would be found that the addition of ionic liquid could increase the porous structure; on the other side, we added the cross-linker 1,3-Diaminopropane(DAP) into the solution of polymer, and then prepare the separators by the casting-film and electrospinning membrane. We tested the physical properties of our separators by SEM、FT-IR、TGA、DSC analysis, and the electrochemical properties by AC impedance analysis. From the SEM analysis, the electrospinning membrane of PVdF-co-HFP could helpfully increase the mobility since the porous structure. It also could be observed the microphase separation after soaked in the ionic liquid. According to the TGA、DSC analysis, we found that after the addition of cross-linker, the mechanical properties promote with the increasing of the ratio of cross-linker without obvious difference of thermal properties. In the electrochemical property analysis, the uptake of electrolyte decreased with the increasing of the ratio of cross-linker after the membrane soaked in the ionic liquid; in the AC impedance analysis, it also shows the same tendency of the ionic conductivity. It explained the influence of the cross-linker for the membrane structure, but the ionic conductivities were still lower than the PVdF-co-HFP separators in lithium-ion batteries. As for the compatibility of aluminum-ion battery, there was a concern about the reactivity for the electrolyte which is wildly used in aluminum-ion battery. It is inferred that if we would like to apply our PVdF-co-HFP electrospinning membrane to aluminum-ion batteries, it is necessary to modify the surface structure of polymer in order to improve the compatibility of aluminum-ion battery.
Li, Mengliu. "Mitigating Polysulfide Shuttling in Li-S Battery." Diss., 2019. http://hdl.handle.net/10754/661542.
Full textWang, Yuan-Bo, and 王淵博. "Study on the Natural Nanofiber Separator Membranes of Li-ion Battery." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/ygyw78.
Full text中國文化大學
化學工程與材料工程學系奈米材料碩士班
103
A separator is an important element in a lithium-ion battery, which is used for determining the battery performance. The demand for lithium-ion batteries has significantly increased due to the rapid development of electronic products, thus triggering more research on the material applications of separators. This experiment used five basis weights of separator paper (12〖g/m^2〗, 14〖g/m^2〗, 16〖g/m^2〗, 18〖g/m^2〗, and 20〖g/m^2〗) in four different ratios of long to short fibers at 100:0, 10:90, 20:80, and 30:70 with a freeness of 300 ml using northern bleached kraft pulp (NBKP) together with laubhǒlxer bleached kraft pulp (LBKP). Using the handsheet (wet laid non-woven) technique with steps such as beating, screening, pressing, and drying, separators made of polyethylene were compared to those previously mentioned to explore their advantages and disadvantages. The study found that the fiber separator with a basis weight of 16 g or more, made from natural fiber NBKP mixed with LBKP, has excellent mechanical strength, well interwoven pores, and a unique nanopore due to its excellent resistance, electrolyte wettability, thermal properties (pyrolysis and heat shrink), smoothness, etc. Compared with commercially available polyethylene separators, natural fibers can become lithium-ion battery separators if the pores are slightly reduced.
Hu, Yu-Ting, and 胡毓庭. "Thermal Property Enhancement of Lithium-ion Battery Membrane Separator Coated with Nanomaterials." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/06809366057820199119.
Full text亞東技術學院
纖維與材料應用產業研發碩士專班
103
As technology has advanced, miniaturized electronic products have become dominant in the market. Although battery sizes have been reduced, the demand for large battery capacity increases. Battery explosions have frequently occurred in recent years, primarily because thermal runaway can occur on the battery separator, causing short circuits and explosions. Such explosions occur during the power generation process, and are caused by the mechanical failure of separators that have undergone nanocoating and surface treatment; thus, examining this phenomenon is crucial. Relevant studies were reviewed that detailed the explosions resulting from static electricity or friction in batteries in which various nanomaterials were integrated with nonwoven fabrics. Common metal powders such as Ag, Au, Pt, Cu, Fe, and Zn were investigated in this study in addition to the novel nanomaterial graphene and its derivatives, which have been prevalently applied in recently developed battery electrodes. Moreover, because the upper and lower explosive limits of the evaluated materials are influenced by humidity, various humidity levels were applied to examine the explosions in batteries after nanomaterials were integrated with nonwoven fabrics. The findings should serve as a crucial reference regarding industrial safety in nanopractical production plants.
Deng, You-Sheng, and 鄧祐昇. "Study on the Organic - inorganic Composite Separator Using in Novel Lithium Battery." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/e4684p.
Full text國立屏東科技大學
材料工程研究所
106
In recent years, there has been a growing demand for batteries for power supply due to the booming development of portable electronic products and electric transport equipment. , Lithium secondary battery which has the advantages of high energy, high power, light weight, long life and good environmental protection, is currently the best mobile power supply. The key issue of lithium battery technology lies in the safety of lithium batteries, but also the highest proportion of the cost component is the separator. The main function of the separator is when the battery abnormal temperature rises, the battery can stop the charge-discharge reaction to avoid the battery explosion caused by overheating. In this dissertation, the coating method was used to coat different BX-100, BX-500 and BX-900 solutions on different substrates. After heat treatment at different temperatures, surface structure analysis and characterization were carried out as the evaluation of a separator. And then, the above-mentioned separators, using button-type lithium battery assembly, assembled into a button-type lithium battery to measure its electrical properties. The results show that BX-100, BX-500 and BX-900 solution after heat treatment at different temperatures have different ability of pores filling, which will affect the performance of button-type lithium battery.
Chang, Jia Cheng, and 張家誠. "Effects of air electrode and separator on cycling performance of lithium air battery." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/hysxc9.
Full text長庚大學
化工與材料工程學系
106
Lithium oxygen battery change the cathode into a air-breathing structure, and use the oxygen as the reactor in the cathode. The operation leads that Lithium air battery provides higher theoretical voltage. Also the theoretical specific energy reaches up to 12 kWh/kg, which is close to the specific energy of the fossil oil, 13 kWh/kg. Among the components in the Lithium oxygen battery, the separator and structure of the cathode have tremendous effect on the efficiency of charging/discharging, impedance and max power rate. The cathode usually decides the charge/discharge efficiency of the whole battery, while separator affects the impedance. On the cathode side, this research will focus on how adding microporous layer and Pt catalyst onto the cathode will effect the cycle life, impedance and max power rate. After adding the microporous layer and Pt catalyst, the max power rate rise from 2.91 mW/cm2 to 4.52 mW/cm2, the ohm impedance reduced due the good conductivity of the Pt particles, while the electrical chemical impedance raised a little bit. The cycle life extended from 40 hours to 250 hours, also the over potential on the first cycle reduce from 1.4V to 1.0V. In order to improve the moisture prevention of the battery, this research changed the test model from the bottle cell to the MTI model. MTI model has 1/16 stainless steel gas tube and is also made of stainless steel, these advantages can stop the moisture from going into the battery’s materials. Under the circumstances that cathode has microporous layer and Pt catalyst on different side of it, the cycle life extended from 250 hours to 1240 hours. On the separator side, the research hopes improve the over potential, cycle life, impedance, open circuit voltage and max power rate via changing the separators into glass fibers or Celgrad polymer commercial separators. The result showed that after changing the separator from glass fiber into Celgard separator, the ohm impedance decreased a little bit, while the electrical chemical impedance was large at first but still decreased as time goes by. The cycle life increase from 1240 hours to 1330 hours due to the smaller pores on the Celgard membrane comparing to the glass fiber, which prevents moisture from penetrating to the lithium metal also allowing lithium ion flows. But the over potential and max power rate didn’t change a lot.
Lin, Tsai Hsuan, and 林采璇. "Fabrication and Characterization of Silica/Nylon66/PMMA Nanofibrous Film as Separator of Lithium-ion Battery." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/7r4ncf.
Full textHSU, WEN-HSIEN, and 許文獻. "Application of Experimental Design for the Parameter Optimization on the Process of Lithium Battery Separator." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/92401335096362505943.
Full text南臺科技大學
工業管理研究所
105
Lithium battery has been widely used in industry and 3C commercial devices owning to its remarkable properties such as high energy, high power efficiency, long cycle life, no memory effect, low electrical self-discharge, and good to the environment. In addition, lithium ionic battery research has been recently attracted to great attention in renewable energy techniques to energy crisis and environmental issues. Among the relative studies, separator acted as a key material of the lithium battery is also drawn great concern. In this study, Causes & Effects Chart was applied to find out the key factors that affecting the quality characteristics of the gurley and the thickness of the membrane which are the in the middle process of separator manufacture. Moreover, Central Composite Design (CCD), one method of Response Surface Methodology (RSM), was employed to optimize the process parameters in order to improve the production yield and lower the cost. The results showed that the average of membrane gurley (in second) is improved from 10.8s to 9.27s where its target is 9s, and its standard deviation is reduced from 0.66s to 0.56s. The average of membrane thickness (in μm) is improved from 20.43μm to 20.02μm with the target of 20μm, and its standard deviation is also shrank from 0.18μm to 0.12μm.
Wan, Yi. "Coordination Polymer Modified Separator for Mitigating Polysulfide Shuttle Effect in Lithium-Sulfur Batteries." Thesis, 2017. http://hdl.handle.net/10754/626342.
Full textBo-HsienWu and 吳柏憲. "A DFT Study on Lattice Expansion of PP/PE/PP Micro-Porous Separator in Lithium-ion Battery." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/91744383120394928312.
Full textLiao, Bo-Hao, and 廖柏豪. "Fabrication and analysis of near-field electrospinning PVDF fibers with sol-gel coating for lithium ion battery separator." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/2d259h.
Full text