Дисертації з теми "Electrolyte solvent"
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Klein, Jeffrey M. "Electrode-Electrolyte and Solvent-Solute Interfaces of Concentrated Electrolytes: Ionic Liquids and Deep Eutectic Solvents." Case Western Reserve University School of Graduate Studies / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=case1620213066452923.
Повний текст джерелаUrata, Tomoko. "Morphology Control of Anodized Porous Silicon from the Viewpoint of Solvent in Electrolyte Solutions." 京都大学 (Kyoto University), 2016. http://hdl.handle.net/2433/217176.
Повний текст джерелаHigashino, Shota. "Electrodeposition of reactive metals and alloys from non-aqueous electrolytes and their applications." Kyoto University, 2020. http://hdl.handle.net/2433/259066.
Повний текст джерелаDougassa, Yvon. "Propriétés de transport et solubilité des gaz dans les électrolytes pour les batteries lithium-ion." Thesis, Tours, 2014. http://www.theses.fr/2014TOUR4035/document.
Повний текст джерелаThe performance and the safety of a lithium-ion battery depend to a great extent on the stability of the electrolyte solution, because the high voltage of the battery may cause the decomposition of lithium salt or organic solvents, which limits then the battery lifetime. During these degradations, several gases are, generally, generated like the CO2, CO, CH4 and C2H4, which induce in fact several problems related to the pressure increase inside the sealed cell. The main objective of this PhD thesis is to understand the key thermodynamic parameters which drive the gas dissolution in classical solvents and electrolytes. For that, several pure solvents and electrolytes have been firstly investigated to determine their volumetric and transport properties, as well as, their vapour pressure as the function of temperature and composition
Engstrom, Allison Michelle. "Vanadium Oxide Electrochemical Capacitors| An Investigation into Aqueous Capacitive Degradation, Alternate Electrolyte-Solvent Systems, Whole Cell Performance and Graphene Oxide Composite Electrodes." Thesis, University of California, Berkeley, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=3616666.
Повний текст джерелаVanadium oxide has emerged as a potential electrochemical capacitor material due to its attractive pseudocapacitive performance; however, it is known to suffer from capacitive degradation upon sustained cycling. In this work, the electrochemical cycling behavior of anodically electrodeposited vanadium oxide films with various surface treatments in aqueous solutions is investigated at different pH. Quantitative compositional analysis and morphological studies provide additional insight into the mechanism responsible for capacitive degradation. Furthermore, the capacitance and impedance behavior of vanadium oxide electrochemical capacitor electrodes is compared for both aqueous and nonaqueous electrolyte-solvent systems. Alkali metal chloride and bromide electrolytes were studied in aqueous systems, and nonaqueous systems containing alkali metal bromides were studied in polar aprotic propylene carbonate (PC) or dimethyl sulfoxide (DMSO) solvents. The preferred aqueous and nonaqueous systems identified in the half-cell studies were utilized in symmetric vanadium oxide whole-cells. An aqueous system utilizing a 3.0 M NaCl electrolyte at pH 3.0 exhibited an excellent 96% capacitance retention over 3000 cycles at 10 mV s-1. An equivalent system tested at 500 mV s-1 displayed an increase in capacitance over the first several thousands of cycles, and eventually stabilized over 50,000 cycles. Electrodes cycled in nonaqueous 1.0 M LiBr in PC exhibited mostly non-capacitive charge-storage, and electrodes cycled in LiBr-DMSO exhibited a gradual capacitive decay over 10,000 cycles at 500 mV s-1. Morphological and compositional analyses, as well as electrochemical impedance modeling, provide additional insight into the cause of the cycing behavior. Lastly, reduced graphene oxide and vanadium oxide nanowire composites have been successfully synthesized using electrophoretic deposition for electrochemical capacitor electrodes. The composite material was found to perform with a higher capacitance than electrodes containing only vanadium oxide nanowires by a factor of 4.0 at 10 mV s-1 and 7.5 at 500 mV s-1. The thermally reduced composite material was examined in both symmetric and asymmetric whole cell electrochemical capacitor devices, and although the asymmetric cell achieved both higher energy and power density, the symmetric cell retained a higher capacitance over 50,000 cycles at 200 mV s-1.
Boisset, Aurelien. "Electrolytes pour supercondensateurs asymétriques à base de MnO2." Thesis, Tours, 2014. http://www.theses.fr/2014TOUR4038/document.
Повний текст джерелаThe aim of this thesis was to investigate the performances of asymmetric supercapacitors based on manganese dioxide (birnessite) and activated carbon electrode materials using various electrolytes. From this work, it appears that neutral aqueous electrolytes containing inorganic salts have the best electrochemical performances. Furthermore, the nature and the structure of both ions (cations and anions) in solution seem to impact strongly the electrochemical performances of the supercapacitors, as well as, the MnO2’s structure stability and affinity. In the case of aqueous-based electrolyte, a device degradation mechanism has been proposed as a function of salt ions structure and nature to further understand the supercapacitor’s life-cycling when a large potential window is applied. Some novel synthesis ways and/or modifications were investigated to further improve the electrochemical properties of MnO2 material. Additionaly, original non-aqueous electrolytes has been also formulated and then characterized, particularly the ‘Deep Eutectic’ Solvents, based on the N-methylacetamide mixed with a lithium salt. However, these electrolytes don’t have a good affinity with manganese oxide-based materials. Interestingly, these Deep Eutectic Solvents show good cycling results with activated carbon. In fact, these electrolytes seem to be promising for high temperature energy storage applications, especially using activated carbon or insertion electrode material like the lithium ferrophosphate
Perricone, Emmanuelle. "Mise au point d'electrolytes innovants et performants pour supercondensateurs." Phd thesis, Université de Grenoble, 2011. http://tel.archives-ouvertes.fr/tel-00630049.
Повний текст джерелаYao, N'guessan Alfred. "Contribution a l'etude des jonctions gaas-electrolyte aqueux et non aqueux : formation de l'interface et cinetique de transfert de charges." Paris 7, 1987. http://www.theses.fr/1987PA077174.
Повний текст джерелаBenzakour, Bouchra. "Ultramicroélectrochimie analytique : étude des phénomènes de transport de matière lors des réactions électrochimiques : application aux réactions engageant des étapes successives." Nancy 1, 1993. http://www.theses.fr/1993NAN10004.
Повний текст джерелаDubois, Corinne. "Sur les proprietes des couches de surface du lithium dans les accumulateurs a electrolytes organiques aprotiques." Paris 6, 1987. http://www.theses.fr/1987PA066345.
Повний текст джерелаFlake, John Christopher. "Photoelectrochemical etching of silicon in nonaqeous electrolytes." Diss., Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/13278.
Повний текст джерелаIvol, Flavien. "Formulation d'électrolytes sécuritaires pour supercondensateurs." Thesis, Tours, 2019. http://www.theses.fr/2019TOUR4020.
Повний текст джерелаThe main objective of this PhD thesis is to design and optimize an efficient and safe organic electrolyte for capacitive supercapacitor applications. The benchmark electrolyte currently used in these particular systems presents a significant safety drawback, due to its high flammability. To overcome this issue, several nitrile and dinitrile solvents have been used to formulate alternative electrolytes for supercapacitors. These solvents were initially identified based on their relatively high thermal stability and low volatility. Furthermore, it was also proposed to substitute the reference molten salt with commercially available aprotic ionic liquids, or ones synthetized in the laboratory. The substitution was found to enhance the salt miscibility and compatibility when combined with selected organic solvents, allowing for the formulation of highly concentrated electrolytes with improved electric double-layer storage process. In addition, the ionic liquid-based electrolytes have a larger liquidus temperature range than that of the benchmark molten salt. More importantly, this work presents a clear strategy led by a multi-parametric experimental approach supported by theoretical calculations to optimize the formulation of safer electrolytes for supercapacitors
Evans, Russell Griffith. "Application of room temperature ionic liquids as electrochemical solvents." Thesis, University of Oxford, 2005. http://ora.ox.ac.uk/objects/uuid:3b09fc8a-d3b0-47ff-8c6e-adaa79a3df1e.
Повний текст джерелаAdami, Fatos. "Analyse infra-rouge in-situ de l'interface electrode metallique/solution par la methode mirftirs : mise au point et application de la technique a l'etude de l'electropolymerisation des phenols sur electrode de fer." Paris 7, 1987. http://www.theses.fr/1987PA077042.
Повний текст джерелаDong, Wei. "Contribution a l'etude theorique de la structure d'un fluide polaire et d'une solution electrolytique au voisinage d'une surface solide." Paris 6, 1987. http://www.theses.fr/1987PA066340.
Повний текст джерелаGabouze, Noureddine. "Etude photoelectrochimique de gaas(n) et si(n) en milieu non aqueux ch::(3)oh et ch::(3)cn : etude et realisation de cellules photoelectrochimiques minces." Paris 6, 1988. http://www.theses.fr/1988PA066242.
Повний текст джерелаSerre, Christophe. "Contribution à l'étude des mécanismes responsables de la dissolution anodique du silicium en milieu acide fluorhydrique aqueux." Grenoble 1, 1992. http://www.theses.fr/1992GRE10189.
Повний текст джерелаPelikán, Ondřej. "Elektrolyty s obsahem retardéru hoření na bázi fosforu." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2018. http://www.nusl.cz/ntk/nusl-377067.
Повний текст джерелаŠtulák, Stanislav. "Stanovení bodu tuhnutí elektrolytů s retardérem hoření kryoskopickou metodou." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-221001.
Повний текст джерелаAhmed, Saifuddin. "Modélisation thermodynamique des mélanges électrolytiques multi-solvants pour les simulateurs de procédés." Thesis, Sorbonne université, 2018. http://www.theses.fr/2018SORUS002/document.
Повний текст джерелаThe capabilities of the current thermodynamic models are limited in dealing with mixed-solvent electrolyte systems, due to the complex interactions within these systems. The objective of this work is to extend eGC-PPC-SAFT model to these systems. This is done in several steps. First, a modification in the temperature dependent water diameter was proposed. Second, a minimum number of ion-water parameters are determined on mean ioninc activity coefficients and densities of strong electrolyte systems, as well as vapour-liquid equilibria (VLE) of mixed solvent electrolytes. In the third step, the model is used to study the liquid-liquid equilibrium (LLE) of the mixed-solvent electrolyte system. This was done by looking at the partition coefficients of the individual species in the systems. In doing so, a parameterization strategy was developed for ion-solvent binaries that involve assessing the impact of the individual ePPC-SAFT contribution on the partitioning of individual species. A new method for dealing with the condition of electroneutrality in liquid-liquid ionic systems was proposed that involves a direct correction on the fugacity coefficient. In view of the importance of this property, a new mixing rule for the dielectric constant of mixed solvent is proposed to provide the best description of LLE of mixed solvent electrolyte. The final model is capable of describing, the activity coefficient, VLE, and LLE of mixed-solvent electrolyte systems
子揚, 曹., and Ziyang Cao. "Dilution effects of highly concentrated electrolyte with fluorinated solvents on charge/discharge characteristics of Ni-rich layered oxide positive electrode." Thesis, https://doors.doshisha.ac.jp/opac/opac_link/bibid/BB13127443/?lang=0, 2020. https://doors.doshisha.ac.jp/opac/opac_link/bibid/BB13127443/?lang=0.
Повний текст джерелаNi-rich ternary materials have higher capacity than the commercial LiCoO2 positive electrode, and therefore they are promising candidates for the positive electrode material of lithium ion batteries for use in EVs. In this thesis, the author focused on highly concentrated electrolytes and their diluted electrolytes with fluorinated solvents to improve the cycling performance of a Ni-rich ternary LiNi0.8Co0.1Mn0.1O2 (NCM811) for practical application. Dilution effects of the concentrated electrolytes on the charge/discharge properties of NCM811 were discussed in detail from the viewpoint of the solvation structure in the electrolyte.
博士(工学)
Doctor of Philosophy in Engineering
同志社大学
Doshisha University
Shen, Dai. "Investigation of Charge Transfer Kinetics in Non–Aqueous Electrolytes Using Voltammetric Techniques and Mathematical Modeling." Case Western Reserve University School of Graduate Studies / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=case1574762430962913.
Повний текст джерелаGuha, Thakurta Soma. "Anhydrous State Proton and Lithium Ion Conducting Solid Polymer Electrolytes Based on Sulfonated Bisphenol-A-Poly(Arylene Ethers)." University of Akron / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=akron1239911460.
Повний текст джерелаMüller, Simon [Verfasser]. "Application and refinement of COSMO-RS-ES for calculating phase equilibria of electrolyte systems at high concentrations in mixed and non-aqueous solvents / Simon Müller." Hamburg : Universitätsbibliothek der Technischen Universität Hamburg-Harburg, 2020. http://d-nb.info/1222589095/34.
Повний текст джерелаGuibert, Sylvie. "Contribution a l'elaboration et a l'etude de nouveaux solvants organiques et electrolytes-supports utilisables dans les generateurs rechargeables au lithium." Rennes 1, 1987. http://www.theses.fr/1987REN10132.
Повний текст джерелаBlanchon, Le Bouhelec-Tribouillois Émilie. "Contribution à la thermodynamique de l'absorption des gaz acides H2S et CO2 dans les solvants eau-alcanolamine-méthanol : mesures expérimentales et modélisation." Thesis, Vandoeuvre-les-Nancy, INPL, 2006. http://www.theses.fr/2006INPL046N/document.
Повний текст джерелаThis work is related to the development of new processes about gas sweetening with hybrid solvents coupling a chemical one (aqueous solution of diethanolamine) with a physical one (methanol). In the liquid phase, CO2 and H2S react with diethanolamine so that the VLE description of these systems is quite complex and requires experimental data. The first part of this work is dedicated to the experimental determination of acid gases + hybrid solvent solubility data. The experimental apparatus was improved to study H2S solubility and CO2 + H2S mixtures solubility in water-diethanolamine-methanol solvents. In the second part, the simultaneous representation of chemical and phase equilibria was realised. The heterogeneous approach developed here combines the Peng-Robinson equation of state for the vapour phase with the Electrolyte-NRTL model for the liquid phase. Parameters are fitted gradually so that the entire system water-diethanolamine-methanol-CO2-H2S system is extrapolated using Electrolyte-NRTL parameters determined by fitting experimental acid gas partial pressures of lower systems. Methanol effect is also described. An original calculation of heat of absorption was also developed. We extended the use of our approach to study others alkanolamines
Thakore, Vaibhav. "Nonlinear dynamic modeling, simulation and characterization of the mesoscale neuron-electrode interface." Doctoral diss., University of Central Florida, 2012. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5529.
Повний текст джерелаPh.D.
Doctorate
Physics
Sciences
Physics
Bernhard, Rebecca Juliane [Verfasser], Hubert A. [Akademischer Betreuer] Gasteiger, and Bernhard [Akademischer Betreuer] Rieger. "Novel Electrolyte Solvents and Additives for Lithium-Ion Batteries and Different Materials Degradation Phenomena / Rebecca Juliane Bernhard. Gutachter: Bernhard Rieger ; Hubert A. Gasteiger. Betreuer: Hubert A. Gasteiger." München : Universitätsbibliothek der TU München, 2014. http://d-nb.info/1059477270/34.
Повний текст джерелаSmortsova, Yevheniia. "Dye sensitized solar cells efficiency improvement : optimization of the electrolyte using ionic liquids/molecular solvents mixture and study of the photodynamic properties of organic indolinic derivative dyes." Thesis, Lille 1, 2018. http://www.theses.fr/2018LIL1R061/document.
Повний текст джерелаAmong all the renewable energy sources, solar energy is the most powerful source far ahead wind or geothermal energies. The first key component of DSSCs is the photosensitizer. It is through this component that the most important steps of photocurrent generation are possible. On the other hand, ionic liquids (ILs) have been proposed as electrolyte for DSSCs due to their peculiar properties: low vapor pressure, high thermal and chemical robustness, tunability of polarity and phase behaviour etc. The objective of this thesis was to get an understanding of the photophysics in the indoline derivated dyes in molecular solvents (MS) and in the IL/MS mixtures. Firstly, the solvent dependence of the spectroscopic properties of D131, D102, D149 and D205 was studied by the steady-state UV-Vis absorption and fluorescence spectroscopy. Then, time-resolved spectroscopy was used to elucidate their photophysics and its solvent dependence. These experiments helped to discern the influence of the hydrogen bond donor and acceptor abilities of the solvent. The solvation dynamics was shown to play a major role in the excited state dynamics of these dyes. This process in IL/MS mixtures was elucidated using the classic fluorescent probe C153 by the means of time-resolved spectroscopy and MD simulations. The complex multi-regime solvation response in these systems was shown to be shaped by the strengthening of the hydrogen bonding between the probe and the mixture components. The results of this thesis work contribute to the fundamental understanding of the photodynamics of the sensitizer and the response of the electrolyte used in the DSSCs
Nunes, de Oliveira Heitor Fernando [Verfasser], Roberto [Akademischer Betreuer] Rinaldi, and Martin [Akademischer Betreuer] Muhler. "Organic solutions of ionic liquids and aqueous solutions of electrolytes as solvents for cellulose chemistry / Heitor Fernando Nunes de Oliveira. Gutachter: Roberto Rinaldi ; Martin Muhler." Bochum : Ruhr-Universität Bochum, 2016. http://d-nb.info/1095884328/34.
Повний текст джерелаDelouis, Grace. "Modélisation QSPR de solvants d’intérêt technologique : les liquides ioniques et les électrolytes pour batteries Li-ion." Thesis, Strasbourg, 2017. http://www.theses.fr/2017STRAF035/document.
Повний текст джерелаThis thesis is dedicated to the modelling of ionic liquids and electrolytes of Li-ion batteries. We developed several SVR models in order to predict 9 interesting properties of these solvents. The models built for the ionic liquids allowed us to detect several problems, and are freely available on the laboratory’s website: infochim.u-strasbg.fr/webserv/VSEngine.html. The models built for the electrolytes were used to model some candidates tested experimentally by our colleagues. As the amount of data is quite small for these solvents, we also tested the transductive approach with the help of the TRR (Transductive Ridge Regression). We have developed an optimization procedure for the method’s parameters, and applied the TRR to the studied solvents. The results obtained with the TRR are slightly better than of the Ridge Regression but stay modest if we want to avoid any accidental damage of the model
Azzouzi, Fouad. "Etude électrochimique de dihalogénomethylène bis (phosphonate de diéthyle) : action de l'anion formé in situ sur divers électrophiles et étude électrochimique des halogénovinylphosphonates formés." Rouen, 1989. http://www.theses.fr/1989ROUES026.
Повний текст джерелаArchane, Anas. "Etude de l'absorption des gaz acides dans des solvants mixtes : développement d'une approche expérimentale originale et modélisation des données par une équation d'état d'électrolytes." Paris, ENMP, 2009. http://www.theses.fr/2009ENMP1599.
Повний текст джерелаThe aim of this study is the characterisation of VLE and chemical equilibria for the systems CO2/Diethanolamine-(DEA)/H2O/MeOH and CO2/Diethanolamine-(DEA)/H2O/PEG400. The effect of physical solvent composition on CO2 absorption has been studied using four compositions (from 0% to 30wt% of alcohol with a fixed composition-30%- of DEA), the measurement being made at T=298. 15K and at various CO2 loading (0 to 0. 9). The experimental measures concerned a both solubility data and liquid phase analysis was obtained. The effect of MeOH composition has been studied using the original experimental device developed previously (Sidi-Boumedine, 2003). For the system with PEG 400, a new experimental device excluding the pressure limitation of the precedent experimental device was developed. The original data base obtained, including the new solubility data and the liquid phase composition, allows the modelling of the system CO2/DEA/H2O/MeOH using an electrolyte equation of state (Fürst, 1993) representing the equilibrium properties of the system and the liquid phase speciation
Skoglund, Emil. "A NUMERICAL MODEL OF HEAT- AND MASS TRANSFER IN POLYMER ELECTROLYTE FUEL CELLS : A two-dimensional 1+1D approach to solve the steady-state temperature- and mass- distributions." Thesis, Mälardalens högskola, Framtidens energi, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-55223.
Повний текст джерелаBley, Michael. "Simulating Osmotic Equilibria by Molecular Dynamics - From Vapor-Liquid Interfaces to Thermodynamic Properties in Concentrated Solutions." Thesis, Montpellier, 2018. http://www.theses.fr/2018MONTS122.
Повний текст джерелаThe aim of this PhD thesis is the development of a new theoretical method based on the simulation of vapor-liquid equilibria by means of molecular dynamics (MD) simulation. This new method predicts thermodynamic properties such as solvent activities and solute activity coefficients of aqueous and organic phases used in liquid-liquid extraction systems. These thermodynamic properties are required for mesoscopic thermodynamic modeling approaches estimating the efficiency and selectivity of a given solvent extraction system up to an industrial scale. Thermodynamic and structural properties of aqueous electrolyte solutions and organic solvent phase including aggregates resulting from amphiphilic extractant molecules are reproduced in very good agreement with previously available experimental and theoretical data. The osmotic equilibrium MD approach provides a new and powerful tool for accessing thermodynamic data
Berhaut, Christopher Logan. "Propriétés de transport des sels de lithium LiTDI et LiFSI : application à la formulation d'électrolytes optimisés pour batteries Li-ion." Thesis, Tours, 2016. http://www.theses.fr/2016TOUR4017/document.
Повний текст джерелаMost of the Li-ion batteries used in electrical devices contain a solution of LiPF6 in alkylcarbonate solvents with the risk of releasing PF5 at elevated temperatures and HF in the presence of water. Several salts are candidates for the replacement of LiPF6, including those based on fluorosulfonylamides and Hückel anions. This work concerns the study of physicochemical and transport properties of lithium 4,5-dicyano-2- (trifluoromethyl)imidazolide (LiTDI) and lithium bis(fluorosulfonyl)amide (LiFSI) based electrolytes and their use in Li-ion battery. First it was revealed that LiTDI is only weakly dissociated in alkylcarbonate mixtures used in Li-ion batteries such as EC/DMC limiting its conductivity. To overcome this disadvantage, a study of the solvation phenomena and of ionic association within the electrolytes was conducted. This study led to a ternary mixture of solvents (EC/GBL/MP) in which LiTDI is more dissociated. This new solvent mixture improves both the transport properties and the thermal stability of the LiTDI based electrolyte without compromising its chemical and electrochemical stability. Finally, the new LiTDI in EC/GBL/MP electrolyte was tested in NMC/graphite batteries under normal (C/10 rate and room temperature) and severe (10C rate and temperatures varying from - 20 ° C to 60 °C) operating conditions. The aluminium corrosion problem encountered by LiFSI based electrolytes was taken into account and a LiTDI/LiFSI salt mixture based electrolyte showing promising results was presented. The findings of this thesis show that LiTDI or LiFSI can be used as lithium salts in electrolytes for Li-ion batteries
Coadou, Erwan. "Organosulphur compounds for electrochemical energy storage applications : supercapacitors and lithium-sulphur batteries." Thesis, Queen's University Belfast, 2016. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.706291.
Повний текст джерелаDahbi, Mouad. "Etude d'électrolytes organiques pour la réalisation de supercondensateurs lithium-ion." Thesis, Tours, 2013. http://www.theses.fr/2013TOUR4031.
Повний текст джерелаThe objective of this thesis is to broaden the knowledge of electrochemical, thermo physical and thermodynamic properties of different efficient and safe organic electrolytes for Lithium-ion Capacitors (LICs). Several solvent structures have been first selected to design new electrolytes based on binary or ternary solvent mixtures. These solvents were then characterized through conductivity, viscosity and electrochemical studies, in order to assess their structure and properties relationships. Based on this investigation, best compromise between mobility and ionic concentration has been evaluated to formulate the best electrolytes. Generally, it was proved that the addition of solvents with very low viscosity provides efficient electrolytes. Based on conductivity and viscosity measurements, a theoretical study on solvent-solvent and solvent-salt interactions has been then performed using different well-known equations based on Stock-Einstein, Jones-Dole and Bjerrum theories to understand, rationalize, correlate and then predict their transport properties. The second part of the study concentrated on the characterization of selected electrolytes in an asymmetric LIC prior to developing such electrolytes in any high performance asymmetric capacitor devices. In other words, the main objective of this part is to verify the compatibility of designed electrolytes with each element, e.g. electrodes (graphite, activated carbon) and current collectors (aluminum), of a LIC device. To drive such analysis, different experimental investigations between electrodes/electrolytes and between collectors/electolytes were in fact investigated. Using this strategy, asymmetric systems LICs containing a formulated organic electrolyte were fully characterized to deter mine the electrochemical performances of the designed solution in LIC conditions and then compared with those observed using classical electrolyte currently used
Chrétien, Fabien. "Etude de l'effet des sels de lithium de la couche de passivation sur la cyclabilité d'un accumulateur lithium-ion." Thesis, Tours, 2015. http://www.theses.fr/2015TOUR4009/document.
Повний текст джерелаLimiting the lithium-ion batteries ageing is a challenge to overcome in the field of spatial applications. The quality of the solid electrolyte interfaces (SEI), created at the electrode surface during the first cycles of the battery, is decisive for its future performances. The SEI is composed of polymers and several lithium salts which are able to dissolve, precipitate and migrate in the electrolyte and hence modify the battery performances. This study aims to understand the impact of the dissolution of these compounds on the cell cycling ability and to propose solutions to avoid the harmful effects of these salts on the battery ageing. The first part of this study is devoted to the study of the effect of dissolved SEI lithium salts (LiF, LiOH, Li2O, Li2CO3 , LiOCH3, LiOC2H5) on the cycling ability of half and full cells.In order to improve the battery performances in spite of the presence of these SEI salts in the electrolyte, two solutions have been examined. The first one is to add a co-solvent belonging to the glyme family which is able to form complexes with lithium ions and the second to use a surfactant additive which will modify the interfacial electrode/electrolyte properties. Results show that in both cases an improvement in half-cell or full-cell cycling ability was achieved
Ah-Lung, Guillaume. "Mise au point et optimisation d'un procédé de synthèse chimique de MnO2 : application aux supercondensateurs aqueux." Thesis, Tours, 2019. http://www.theses.fr/2019TOUR4022.
Повний текст джерелаThe emergence of applications requiring increasingly high energy and power densities while ensuring safety utilization, at the most interesting costs stimulates the research of efficient, simple to implement, eco-friendly and non-hazardous materials.This thesis focuses on the synthesis of manganese oxides, with controlled-morphology and –structure as a positive electrode for asymmetric supercapacitors operating in aqueous electrolyte as part of the current environmental and industrial policies. An initial investigation of the synthesis parameters allowed us to identify the pH as a predominant parameter for controlling the oxide morphology and structure at room temperature. The combination of viscous solvent and basic pH led to crystalline Birnessite manganese oxide, attractive for electrochemical applications. A deep physicochemical and electrochemical study highlighted a strong correlation between the morphological, structural and textural properties with electrochemical performances. Thus, such materials exhibit capacitances around 200 F.g-1. The development of MnO2//Graphene asymmetric supercapacitors operating in aqueous electrolyte generate high energy and power densities (> 15 Wh.kg-1, > 2 kW.kg-1) compared to similar devices reported in literature. Moreover, further studies were performed to better understand the MnO2 storage mechanisms and demonstrated that an electrode sizing with a high loading (> 10 mg.cm-2) is possible, while maintaining interesting performances. A thermodynamic investigation of aqueous electrolytes highlights the cyclability of our devices at -20°C, giving a solution to other constraints
Hsu, Shu-Ming, and 許書銘. "A Study on the Solubilities of Electrolyte Mixed Solvent Systems." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/43594507151211380247.
Повний текст джерела國立臺灣科技大學
化學工程系
88
The objective of this study is to investigate the solubility of salt in mixed solvent systems. In the experimental part, a gravimetric analysis apparatus was employed to measure the solubility at 298.15K for nine ternary systems of ethanol-water-NaCl, n-propanol-water-NaCl, i-propanol -water-NaCl,n-butanol-water-NaCl, methanol-water-NaBr, ethanol -water -NaBr, n-propanol-water-NaBr, i-propanol-water-NaBr, and n-butanol -water-NaBr. In the theoretical part, the Chen’s models(1982, 1986) were used to calculate the mean activity coefficients of electrolyte in both binary and ternary electrolyte solutions, respectively. A calculation scheme with Chen’s models is developed to determine the solubilities for the nine ternary systems mentioned above. It was found that the calculated results agree well with the experimental data, with mean absolute deviations ranging from 0.013 to 0.092 for the nine ternary systems studied.
Wu, Ming-Song, and 吳明崧. "A Study on Liquid-Liquid Equilibria of Electrolyte Mixed Solvent Systems." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/45057761185665660469.
Повний текст джерела國立臺灣科技大學
化學工程系
87
The objective of this study is to investigate salt effects on liquid-liquid equilibria (LLE) in mixed solvent systems, including experimental measurements and theoretical predictions. For a temperature range of 15-35oC with an increment of 10oC, the experiments of LLE for binary systems of n-butanol(NBA)- water, iso-butanol(IBA)- water and sec-butanol(SBA)- water and that for ternary system of n-butanol(NBA)- water- NaCl were made and checked with literature data. At a single temperature of 25oC, the LLE data for ternary systems of n-butanol(NBA)- water- KCl, iso-butanol(IBA)- water- KCl and sec-butanol(SBA)- water- KCl were measured in this study. In theoretical simulation, the activity coefficients of solvents were calculated by Tan''s modified Wilson model, combined with vapor pressure model of electrolyte aqueous solutions. The Gibbs-Duhem equation was used to calculate mean activity coefficient of the electrolyte. Based on the scheme of flash calculation, the mole fractions in both phases were predicted without adding new adjustable parameter. It was found that the theoretical simulations for the six cases reported in this study were in good agreement with experimental data.
Chih-AoLiao and 廖之敖. "Graphite anode surface redox reaction analysis and development of new electrolyte solvent molecules." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/v3hp28.
Повний текст джерела國立成功大學
材料科學及工程學系
107
By comparing graphite anode electron potential (Fermi level) and electrolytes’ electron affinity (EA), the tendency of electron transfer between electrode and electrolytes is revealed. The transfer has long been considered as the key mechanism to initiate SEI formation at the early stage of batteries charging. There is difficulty to compare the two energy levels due to different reference energy by different computational tools. The background charge, however, artificially change vacuum electrostatic potential resulting in incorrect work function, so as misalignment of fermi levels. To solve it, the fixed density of state assumption was adopted to estimate the Fermi level shifting due to add or extract additional charges. We calculated graphite armchair and zigzag surfaces with three conditions, pristine, hydrogen terminated and hydroxide terminated surfaces. DOS and work function are calculated to compare each surfaces Fermi level as respect to vacuum level. We finally found that the surfaces with hydrogen and hydroxide terminated surfaces have higher Fermi level as respect to pristine ones. Eelectrochemical stability window also shows that lithium ion solvated EC is the most reactive molecule in electrolytes that receive electron. To improve it, high-throughput modification and EA/IE prediction algorism is used for searching alterative molecules. Result shows that B-centered with 3 methoxy functional groups molecule has potential to be the alterative molecule due to the broaden electrochemical stability window and stable structure during redox reaction. Moreover, with low dipole moment and polarizability, we consider that B_methoxy molecule has potential to replace DEC.
Yang, Cheng-Ta, and 楊政達. "Study of efficiency and stability of organic solvent/ionic liquid applications of electrolyte solvent on e Dye-Sensitized Solar Cells." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/11547917486585098789.
Повний текст джерела明志科技大學
化學工程研究所
99
The object of this research is to study the organic-solvent/ionic-liquid systems as electrolyte solvents for applications in dye-sensitized solar cells (DSSCs), and to observe the effects of viscosity and conductivity of the electrolytes on the cell efficiency and stability of DSSCs. Cells were fabricated from twenty electrolyte solvents together with light absorbing TiO2 electrode and Pt counter electrode. Cells’ current-voltage (IV) curves were measured and observed for 600 hrs. Organic solvents employed in this study were propylene carbonate (PC) and acetonitrile(AN) ; while ionic liquids include 1-butyl-3-methylimidazolium tetrafluoroborate (BMIBF4) and 1-N-butyl-3-metylimidazolium hexafluoro- phosphate (BMIPF6). Twenty electrolyte solvent systems were prepared by combinations of the above components. Experimental results showed that viscosity and conductivity of the electrolytes has direct effect on the efficiency of the cells. These results help to select proper electrolyte systems for applications on DSSCs. In general, desirable cell performance can be achieved by using mainly organic solvent in the electrolyte system; however, certain amount of ionic liquid helps to enhance cell stability. The results also showed that no matter BMIBF4 or BMIPF6 were employed, there was not obvious difference in the viscosity and conductivity of the electrolytes; cell efficiency and stability also remained almost the same. Detailed process of the cell assembly was also demonstrated in this study.
Cheng, Cheng-Liang, and 鄭丞良. "Conductive Behavior of Lithium Ions in Polyacrylonitrile-based Gel Polymer Electrolyte Containing Non-solvent." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/81015026084299217310.
Повний текст джерелаMing-CheYang and 楊明哲. "Fabrication of photovoltachromic cells using screen-printed tungsten oxide and solvent-free polymer electrolyte." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/80782337416117182646.
Повний текст джерела國立成功大學
化學工程學系碩博士班
101
Tungsten oxide films have been formed by screen-printed. First, peroxopolytungstic acid solution was mixed with a binder to form a slurry and printed on the FTO glass substrates. By the electrical measurement, tungsten oxide films show a good electrochromic properties. Afterward, this tungsten oxide film was applied to the photovoltachromic devices. To assemble the photovoltachromic devices combine screen-printed tungsten oxide/platinum composite electrode and N719 dye-sensitized titanium dioxide electrode. The solvent free polymer electrolyte was applied to photovoltachromic devices. By the adjustment of the electrolyte, the optical properties and the photoelectric conversion efficiency of the photovoltachromic devices were analyzed. Under illumination, the response time for coloring and bleaching the cell with short-circuited and open-circuited are 8 and 6s, respectively. In addition, it shows the response time for coloring and bleaching under illumination and dark are 8 and 81s. The cell’s photoelectric conversion efficiency was 0.28%, and the transmittance of the colored photovoltachromic devices was variable by adjusting the variable resistance in series with photovoltachromic devices.
Tsai, Yueh-fu, and 蔡岳甫. "A Modified Setschenow Equation and its application for Liquid-Liquid Equilibria of Mixed Solvent-Electrolyte Systems." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/68217829903096885894.
Повний текст джерела國立臺灣科技大學
化學工程系
88
The objective of this study is to modified Setschenow equation to describe the salt effects on liquid-liquid equilibria (LLE) of mixed solvent systems. In experimental part, the experiments of LLE for binary systems of n-butanol- water, iso-butanol- water and sec-butanol- water and that for ternary system of n-butanol- water- NaCl were made and checked with literature data (De Santis, 1976). The LLE data for ternary systems of n-butanol- water- KCl, iso-butanol- water- KCl and sec-butanol- water- KCl were measured at a single temperature of 298.15K. In the theoretical simulation, the Setscheonw equation was modified and used to calculate the mole fraction of electrolyte in the aqueous phase. The activity coefficients of solvents in mixed solvent-electrolyte systems were calculated by the TTK-Wilson model. Based on the material balance in phase equilibria, the mole fractions in both phases were calculated by using two adjustable parameters. It was found that the theoretical simulations for the twelve systems reported in this study were in good agreement with experimental data. The mean deviation range from 0.004 to 0.015.
Duignan, Timothy Thomas. "Modelling specific ion effects with the continuum solvent." Phd thesis, 2015. http://hdl.handle.net/1885/13642.
Повний текст джерела林秀育. "Preparation and characterization of capacitor element of solidpolymer electrolyte of Ppy/Al2O3/Al- effect of dopant and solvent." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/30448085432589354164.
Повний текст джерела國立勤益技術學院
化工與材料工程系
93
This investigation is focus on the preparation of the polypyrrole composite films, Ppy/Al2O3/Al, used as solid-state capacitor with electrochemically polymerization in aqueous solution in the presence of various kinds of dopant and solvent. Further, factors that affected the characteristics of Ppy/Al2O3/Al were explored including the kind of dopant; concentration of dopant; the kind of solvent; ratio of organic solvent/volume of water; and the coulombs of electricity passed. Further, the durability testing of solid polymer electrolyte capacitor was loaded at a constant voltage situation and that was in situ also analyzed via AC impedance. From the experimental results revealed that the capacitance increased from 574.3 to 616.8 and the value of DF decreased from 39.93 to 18.53% in the presence of 0.1 M DBSA when the dopant concentration of 2-NSNa increased from 0 to 0.01 M. On the other hand, leakage current decreased from 0.0067 to 0.0056 when the dopant concentration of ammonium adiapate increased from 0 to 0.005 M in the presence of 0.1 M DBSA solution. In addition, the capacitance increased from 574.3 to 684.3 and DF decreased from 39.3 to 13.7 when the volume ratio of DMSO/water increased from 0 to 10 %. The performances of capacitor were also explored. Leakage current(Lc), capacitor(Cs), dicipation factor (DF) and equivalent series resistance(ESR), these parameters of the solid-state capacitor were measured. On the other hand, the surface morphologies and compositions of the prepared Ppy/ Al2O3 /Al electrolyte were examined with SEM and EDS, respectively. The increasing of the surface area of Al plate by etching process was detected by BET method. The optimum operating conditions using 2-NSNa as a dopant for this system were added 10% DMSO/H2O, 0.01M added 2-NSNa, 0.1 M added DBSA, and 3 coulombs of electricity passed. The performances of capacitor were Lc, Cs , DF , and ESR . In addition, the optimum operating conditions in the presence of 0.1 M DBSA and ammonium adiapate as dopants for this system were added 10 % DMSO/H2O, 0.05M added ammonium adiapate, and 4 coulombs of electricity passed. The performances of capacitor were Lc, Cs , DF , and ESR . The major resistances of the solid polymer electrolytic capacitors that were prepared by supplied 4.0 coulombs of electricity passed were contributed from the film of aluminum oxide, ( ) and the resistance of polypyrrole electrolyte ( ), while the solid polymer capacitor was analyzed via an AC impedance with a 4 V loading. For a 1000 h durability testing of solid polymer electrolyte showed that both the resistance of and was up to 62337 and 9409 in the presence of 2-NSNa as dopant. Further, the resistances of and were and 874.5 using an ammonium adiapate dopant.
Lin, Chun-yun, and 林君芸. "Compatibility of LiFePO4 and LiNi1/3Mn1/3Co1/3O2 electrode materials with quaternary-ammonium based ionic liquid mixed with organic solvent electrolyte system." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/82121674113036624634.
Повний текст джерела國立臺南大學
材料科學系碩士班
100
Ionic liquids (ILs) have been proposed as electrolytes for long-lived and safe LIBs, due to their non-flammability and low volatility. The interactions between cathodes (as olivine LiFePO4 or layered LiNi1/3Mn1/3Co1/3O2 (NMC)) and ionic liquid mixed with organic solvent electrolye were investigated by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), scanning electron microscope(SEM), fourier transform infrared (FTIR), and coin cell test. The electrolyte was mixed with an ionic liquid bis(trifluoromethanesulfonyl)imide (TFSI) as anion and tetraethylammonium (N2222) as cation, and ethylene carbonate (EC) and dimethyl carbonate (DMC). The results show that the LiFePO4 cathode in ionic liquid mixed with organic electrolyte has the better rate capability and cycling performance than the NMC cathode. However, the cycling performance of the NMC cathode in the IL based electrolyte is worse than that of the LiFePO4, due to the surface reaction between the IL based electrolyte and the NMC cathode.