Дисертації з теми "Lithium thin films"
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Berggren, Elin. "Diffusion of Lithium in Boron-doped Diamond Thin Films." Thesis, Uppsala universitet, Molekyl- och kondenserade materiens fysik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-413090.
Повний текст джерелаSlaven, Simon. "Thin film carbon for lithium ion batteries /." Thesis, Connect to Dissertations & Theses @ Tufts University, 1996.
Знайти повний текст джерелаAdviser: Ronald B. Goldner. Submitted to the Dept. of Electrical Engineering. Includes bibliographical references. Access restricted to members of the Tufts University community. Also available via the World Wide Web;
Santos-Ortiz, Reinaldo. "Thin Films As a Platform for Understanding the Conversion Mechanism of FeF2 Cathodes in Lithium-Ion Microbatteries." Thesis, University of North Texas, 2015. https://digital.library.unt.edu/ark:/67531/metadc804977/.
Повний текст джерелаWei, Guang. "Lithium cobalt oxide thin films : preparation and characterization for electrochromic applications /." Thesis, Connect to Dissertations & Theses @ Tufts University, 1991.
Знайти повний текст джерелаSubmitted to the Dept. of Electrical Engineering (Electro-Optics Option). Includes bibliographical references. Access restricted to members of the Tufts University community. Also available via the World Wide Web;
Nagy, Jonathan Tyler. "Periodic Poling of Lithium Niobate Thin Films for Integrated Nonlinear Optics." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1587673156665861.
Повний текст джерелаStrauß, Florian, Janek Binzen, Erwin Hüger, Paul Heitjans, and Harald Schmidt. "Thin LixSi Films Produced by Ion Beam Sputtering." Diffusion fundamentals 21 (2014) 11, S.1, 2014. https://ul.qucosa.de/id/qucosa%3A32405.
Повний текст джерелаStrŭzik, M., J. L. M. Rupp, S. Buecheler, and M. Rawlence. "Physical and Electronic Characterization of Li7La3Zr2O12 Doped Thin Films." Diffusion fundamentals 21 (2014) 10, S.1, 2014. https://ul.qucosa.de/id/qucosa%3A32403.
Повний текст джерелаReinacher, Jochen [Verfasser]. "Thin films of lithium ion conducting garnets and their properties / Jochen Reinacher." Gießen : Universitätsbibliothek, 2014. http://d-nb.info/1068633867/34.
Повний текст джерелаCampbell, Bryce W. "Preparation and characterization of lithium thiogermanate thin films using RF magnetron sputtering." [Ames, Iowa : Iowa State University], 2006.
Знайти повний текст джерелаClayton, Donald. "Characterization of Lithium Aluminum Oxide Solid Electrolyte Thin Films from Aqueous Precursors." Thesis, University of Oregon, 2018. http://hdl.handle.net/1794/23125.
Повний текст джерелаMöller, Alexander [Verfasser]. "Study of the mechanism of lithium insertion and depletion in lithium iron phosphate thin films / Alexander Möller." Gießen : Universitätsbibliothek, 2014. http://d-nb.info/106887449X/34.
Повний текст джерелаStewart, Brian K. "Development of a Thin-Film Evaporative Cooling System for a High Energy Thulium Holmium: Lutetium Lithium Flouride Solid-State Laser Oscillator Crystal." Thesis, Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/6973.
Повний текст джерелаBaumann, Annika [Verfasser]. "Lithium-ion conducting thin-films for solid-state batteries prepared by chemical solution deposition / Annika Baumann." Gießen : Universitätsbibliothek, 2019. http://d-nb.info/1185976930/34.
Повний текст джерелаStewart, Brian K. "Development of a thin-film evaporative cooling system for a high energy thulium holmium lutetium lithium fluoride solid-state laser oscillator crystal /." Available online, Georgia Institute of Technology, 2005, 2004. http://etd.gatech.edu/theses/available/etd-12032004-114711/unrestricted/stewart%5Fbrian%5Fk%5F200505%5Fmast.pdf.
Повний текст джерелаS. Mostafa Ghiaasiaan, Committee Chair ; Sheldon M. Jeter, Committee Member ; Said I. Abdel-Khalik, Committee Member. Includes bibliographical references.
Wang, Ying. "Enhanced Li-ion intercalation properties of vanadium oxides /." Thesis, Connect to this title online; UW restricted, 2006. http://hdl.handle.net/1773/10561.
Повний текст джерелаMacaraig, 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.
Повний текст джерелаFigueroa, Cadillo Robinson. "Microestruturas em filmes finos de WO3 : aplicações em microbaterias." [s.n.], 2007. http://repositorio.unicamp.br/jspui/handle/REPOSIP/277315.
Повний текст джерелаTese (doutorado) - Universidade Estadual de Campinas, Instituto de Fisica Gleb Wataghin
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Resumo: Em dispositivos eletroquímicos como microbaterias ou dispositivos eletrocrômicos o catodo está presente na forma de filme fino. Com o objetivo de otimizar a performance de tais dispositivos, a pesquisa cientifica e tecnológica tem sido orientada na busca de novos materiais para o catodo. Este trabalho, contudo, propõe-se estudar a influencia da morfologia e da microestrutura do catodo no comportamento eletroquímico das microbaterias. O material escolhido foi o WO3. As amostras foram depositadas por sputtering reativo, e diversos parâmetros de deposição foram variados. Explorou-se a variação da potência durante a deposição e, trabalhou-se com o substrato inclinado, em modo estacionário ou rodante. Utilizaram-se diversas técnicas de caracterização. A técnica de Microscopia de Força Atômica (AFM) foi utilizada para analise de área da superfície, rugosidade, e tamanho de grão. A técnica de microscopia eletrônica MEV-FEG foi utilizada na analise da seção transversal dos filmes. O estudo eletroquímico por cronopotenciometria cíclica com limite de potencial permitiu a obtenção da capacidade de carga/descarga durante diversos ciclos. Foram obtidas amostras com e sem estrutura colunar; além disto, morfologias tipo hélice ou pilares foram conseguidas com rotação do substrato. A capacidade de carga depende fortemente do tipo de morfologia. Os melhores resultados foram obtidos com alta potência, para todas as estruturas
Abstract: In electrochemical devices like microbatteries or electrochromic devices, the cathode is present in thin film form. In order to optimize the performance of these devices, the scientific and technological research has been oriented in the search of new cathode materials. The aim of this work, however, is to study the influence of the cathode morphology and microstructure on the electrochemical behavior of microbatteries. WO3 was chosen as the thin film compound. The samples were deposited by reactive sputtering, and several deposition parameters were varied. The power during deposition was fixed in different values, and the samples were deposited with inclined substrates either stationary or rotating. Atomic Force Microscopy was used in order to obtain the surface area, roughness and grain size. Scanning electron microscopy was used in the analysis of the cross sections. The electrochemical study using chronopotentiometry with potential limits allowed the obtention of the charge/discharge capacity during several cycles. Depending on the deposition conditions, samples with or without columnar structures were obtained; also, helicoidal or pillar morphologies were attained with the rotation of the substrate. The charge capacity is strongly dependent on the morphology. The best results were obtained with high power, for all structures
Doutorado
Física
Doutor em Ciências
Kenny, Leo Thomas. "Preparation and characterization of lithium cobalt oxide by chemical vapor deposition for application in thin film battery and electrochromic devices /." Thesis, Connect to Dissertations & Theses @ Tufts University, 1996.
Знайти повний текст джерелаAdviser: Terry E. Haas. Submitted to the Dept. of Chemistry. Includes bibliographical references. Access restricted to members of the Tufts University community. Also available via the World Wide Web;
Son, Ji-Won. "Direct-write e-beam sub-micron domain engineering in lithium niobate thin films grown by liquid phase epitaxy /." May be available electronically:, 2004. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.
Повний текст джерелаPoinot, Delphine. "Etude de couches minces de CuO pour électrode positive à forte capacité surfacique : Application aux microbatteries au lithium." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2011. http://tel.archives-ouvertes.fr/tel-00834384.
Повний текст джерелаGreen, Sara. "Electrochromic Nickel – Tungsten Oxides : Optical, Electrochemical and Structural Characterization of Sputter-deposited Thin Films in the Whole Composition Range." Doctoral thesis, Uppsala universitet, Fasta tillståndets fysik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-179764.
Повний текст джерелаNagpure, 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.
Повний текст джерелаTintignac, Sophie. "Étude structurale et électrochimique de films de LiCoO2 préparés par pulvérisation cathodique : application aux microaccumulateurs tout solide." Phd thesis, Université Paris-Est, 2008. http://tel.archives-ouvertes.fr/tel-00461688.
Повний текст джерелаPorthault, Hélène. "Étude de nouvelles voies de dépôt du matériau d'électrode positive LiCoO2 pour la réalisation de micro-accumulateurs 3D à haute capacité surfacique." Thesis, Paris 11, 2011. http://www.theses.fr/2011PA112185/document.
Повний текст джерелаThe miniaturization of electronic systems is today a main topic of research and requires an important evolution of energy sources. All solid state micro-batteries are a perfectly adapted solution for this need. However, their specific capacity is limited to 50-200 µAh.cm-2 due to the difficulty to use films of active materials thickness over than 5 µm. One of the answers to enhance micro-batteries specific capacity is to deposit materials on textured substrate. Nevertheless, classical vacuum deposition techniques are not adapted to deposit conformal thin films on such surfaces because of shadow effects. The aim of this PhD-work was to develop new synthesis routes to realize 3D all solid state micro-batteries. Two chemical synthesis routes were studied: the sol-gel method and the electrodeposition under hydrothermal conditions. The sol-gel synthesis was not efficient to realize conformal and dense films. However, this technique was very effective to obtain rhombohedra LiCoO2 powders with high specific surface, without grinding step, at moderate temperature (600-700°C). The electrodeposition under hydrothermal conditions was very promising, both for its high deposition rate (up to 300 nm.mn-1) and its low synthesis temperature (from 125°C) without any annealing. The synthesized films exhibited excellent electrochemical performances in liquid electrolyte and a conformity higher than 97 % on textured substrates
Souza, Junior Edvaldo Alves de. "Filmes Cu-V-O para aplicações em catodos de microbaterias." [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/277289.
Повний текст джерелаTese (doutorado) - Universidade Estadual de Campinas, Instituto de Fisica Gleb Wataghin
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Resumo: O pentóxido de vanádio é um dos compostos de intercalação mais conhecidos na área de baterias de lítio. Dada sua estrutura lamelar, íons de lítio podem ser inseridos e extraídos de forma reversível, o que torna o pentóxido de vanádio promissor para uso como catodo. No entanto, o armadilhamento de parte dos íons de lítio a cada ciclo de carga e descarga provoca a perda gradativa da capacidade. A incorporação de íons metálicos na estrutura do V2 >O5 é uma das alternativas para melhorar seu desempenho nos ciclos de carga e descarga. Por outro lado, foi demonstrado que o óxido de cobre nanoparticulado é capaz de fornecer alta capacidade de carga em processos reversíveis de inserção e extração de íons lítio. Esta tese se propõe estudar a inserção/extração de íons de lítio em filmes finos de óxidos de cobre-vanádio objetivando sua aplicação em catodos de microbaterias. Um conjunto de amostras foi obtido iniciando-se com o pentóxido de vanádio, e através de acréscimos de cobre e decréscimos de vanádio, atingindo o óxido de cobre II. Óxidos bronzes, complexos, mistos e puros foram obtidos. As amostras foram depositadas através da técnica de sputtering. Na caracterização das amostras foram utilizadas técnicas de difração de raios-X, retroespalhamento Rutherford, emissão de fotoelétrons de raios-X, absorção de raios-X (XANES) e microscopia de força atômica. A inserção de íons de lítio foi realizada através da cronopotenciometria. Cada classe de óxidos apresentou características eletroquímicas próprias. Óxidos de cobre apresentaram uma capacidade de inserção de carga quatros vezes maior que a capacidade do pentóxido de vanádio (109 µAh/cm 2-µm). Bronzes de vanádio apresentaram maior estabilidade entre todos óxidos, e melhor capacidade, quando comparado com o V2 O5. A introdução de átomos de vanádio na matriz CuO permitiu a formação de óxidos mistos com maior estabilidade eletroquímica quando comparados à filmes CuO
Abstract: In the field of lithium batteries, vanadium pentoxide is one of the most studied intercalation compound. Due to its lamellar structure, lithium ions can be reversibly inserted and extracted, and the material is a promising candidate for use as a cathode. However, trapping of part of the lithium ions in each charge/discharge cycle causes a gradative loss of capacity. The incorporation of metallic ions in the V22O5host structure is one of the alternatives to improve its cycling behavior. On the other hand, it was recently demonstrated that nanosized copper oxide is capable of providing high charge capacity in reversible lithium insertion/extraction processes. The aim of the present work is to study the insertion/extraction of lithium ions in thin films of copper-vanadium oxides for application as cathode in microbatteries. A range of samples was produced, starting from pure vanadium pentoxide. By increasing the amounts of copper and decreasing the amount of vanadium in the film, the copper oxide II composition was attained. Different classes of oxides, such as bronzes, complex oxides, mixed oxides and the pure oxides were obtained. The samples were deposited by sputtering. The characterization was performed using X-Ray diffraction, Rutherford Backscattering spectrometry, X-Ray Photoemission Spectroscopy, X-Ray Absorption Spectroscopy (mainly XANES) and Atomic Force Microscopy. The electrochemical behavior was analyzed mainly by chronopotentiometry. Each class of oxides presented distinct electrochemical properties. Copper oxide films presented an insertion capacity four times greater than the capacity of the vanadium pentoxide films (109 µAh/cm 2-µm). Vanadium bronzes presented the best stability among all of the investigated materials, and a higher capacity in comparison to vanadium pentoxide. The insertion of vanadium atoms in the CuO structure allowed the obtention of mixed oxides films with higher electrochemical stability if compared to pure CuO films
Doutorado
Superfícies e Interfaces ; Peliculas e Filamentos
Doutor em Ciências
Bach, Philipp Johannes [Verfasser], Martin [Gutachter] Stratmann, and Frank Uwe [Gutachter] Renner. "Lithiation and delithiation mechanisms of model anodes for lithium ion batteries using the example of Au thin films / Philipp Johannes Bach ; Gutachter: Martin Stratmann, Frank Uwe Renner." Bochum : Ruhr-Universität Bochum, 2014. http://d-nb.info/1142001296/34.
Повний текст джерелаDorotík, David. "Deponované vrstvy na bázi olova a kobaltu pro Li-ion akumulátory." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2021. http://www.nusl.cz/ntk/nusl-442525.
Повний текст джерелаPark, Dae Hoon. "Optimisation de films minces électrochromes à base d’oxyde de nickel." Thesis, Bordeaux 1, 2010. http://www.theses.fr/2010BOR14031/document.
Повний текст джерелаAiming at enhancing the electrochromic properties of NiO thin films, deposited on FTO substrates, we have employed three different approaches. They deal with: 1) lithium doping of NiO, the corresponding thin film-deposition method is PLD (Pulsed Laser Deposition); 2) NiO nanoparticles embedded into zinc doped amorphous titanium oxide matrix, a solution method is used to deposit the corresponding thin films ; 3) Carbon-doped NiO thin films deposited using, a specific sol-gel method. Owing to lithium doping of NiO, we could induce film amorphization, thereby enhancing the film electrochemical-capacity. Most importantly, the adhesion between the film and the FTO substrate was improved leading to enhanced electrochemical cyclability in aqueous KOH electrolyte. We could enhance the electrochromic performances of TiO2/NiO composite thin films by doping TiO2 with Zn2+, forming to a new composite thin film Ti1-xZnxO2-x?x-NiO. Finally we have successfully stabilized the electrochromic properties (durability and optical property) of NiO thin films in aqueous KOH electrolyte, owing to the development of a specific sol-gel method leading to carbon-doped NiO nanoparticles. For the first time 25000 cycles were successfully achieved without significant decrease of the electrochromic performances
Flamary-Mespoulie, Florian. "Synthèse et caractérisation de sulfures de métaux de transition comme matériaux d’électrode positive à forte capacité pour microbatteries au lithium." Thesis, Bordeaux, 2016. http://www.theses.fr/2016BORD0322/document.
Повний текст джерелаThe overgoing evolution of the microelectronics industry implies new specifications when it comes to next generations of lithium microbatteries. It is now of utmost importance for these devices to increase the volumetric capacity of the positive electrode material and bring the working potential down to approxi-mately 1.5 V. Hence, this work is aimed at studying the behavior of transition metal sulfides, of formula MSx (M = Fe, Co, Ni ; x = 1, 2), which react towards lithium through conversion reaction mechanism at an adapted potential. Thin films of these materials, prepared via non-reactive radiofrequency magnetron sputtering were structurally, morphologically and compositionally characterized prior to their integration in microbatteries. In most cases, crystallized films were obtained without any intentional heating of the substrates. Also, very low oxygen incorporation within the deposited materials was observed. Thanks to the combined use of thin film and all-solid-state configuration in the microbatteries, good reversibility of the reactions is allowed and parasitic reactions generally observed for transition metal sulfides electrodes in conventionally used liquid electrolytes cells can be avoided. Thus, deep electrochemical characteriza-tions were successfully conducted on the microbatteries. For these materials, it was shown that the re-versibility of the lithium insertion / extraction cycles during operation is directly linked to the nature of the transition metal cation and to the overall sulfur concentration in the electrode material
Kovalevich, Tatiana. "Tunable Bloch surface waves devices." Thesis, Bourgogne Franche-Comté, 2017. http://www.theses.fr/2017UBFCD022/document.
Повний текст джерелаThis thesis is devoted to develop tunable devices on the base of one-dimensional photonic crystals (1DPhC) which can sustain Bloch surface waves (BSWs).First, we explore the possibilities to control the BSW propagation direction with polarization of incident light. In this case we manufacture additional passive structures such as gratings on the top of the 1DPhC, which are working both as a BSW launcher and polarization–controlled “wave-splitters”. We test this type of launcher in air and in water as an external medium. Then, we demonstrate the tunability of the BSW by adding an active layers into the multilayer stack. Here a crystalline X-cut thin film lithium niobate (TFLN) is used to introduce anisotropic properties to the whole 1DPhC. Different ways to manufacture 1D PhCs with LiNbO3 on the top would be described. Finally, we explore the concept of the electro-optically tuned BSW
Dubois, Vincent. "Electrodes positives lithiées d’oxysulfures de titane pour microbatteries Li-ion." Thesis, Bordeaux 1, 2013. http://www.theses.fr/2013BOR14858/document.
Повний текст джерелаLarge-scale development of microbatteries for various applications such as back-up power sources for cell phone electronic components needs suitability with reflowing process that is often used in microelectronic. Here we report on the development of a new realization process to produce lithiated titanium oxysulfides (LixTiOySz) thin films for use as positive electrode in Li-ion microbatteries. First of all, this work began with synthesis and characterization of several lithiated titanium sulfides compounds prepared by reaction between TiS2 or TiS3 with n-butyllithium but also by solid state reaction at high temperature between TiS2, Li2S and Ti. Then, LixTiOySz thin films were sputtered by magnetron effect radio-frequency sputtering from targets made of lithiated materials previously synthesized. The chemical composition of those films depends on the target one and allows obtaining thin films with different lithium and sulfur contents. In contrast, they are all amorphous, dense and they don’t have a morphological structuration. Finally, electrochemical characterizations of thin films, both in liquid and solid electrolyte, have highlighted a correlation between their chemical composition and their electrochemical behavior. Taken as a whole, LixTiOySz thin films are powerful, suitable with reflowing process and thus very interesting for the application
Trupkovic, Alexandra. "Etude de verres borates de lithium utilisables dans les microbatteries : corrélation conductivité ionique / propriétés thermomécaniques." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2009. http://tel.archives-ouvertes.fr/tel-00659229.
Повний текст джерелаMartin, Lucile. "Etude de l'oxyde de cuivre CuO, matériau de conversion en film mince pour microbatteries au lithium : caractérisation des processus électrochimiques et chimiques en cyclage." Thesis, Pau, 2013. http://www.theses.fr/2013PAUU3027/document.
Повний текст джерелаThe miniaturization of electronic components and the increasing number of their functionalities lead to the development of suitable energy microsources, among which lithium microbatteries appear. Despite the excellent performances of these all-solid-state electrochemical power sources, one main limitation that remains is their surface capacity. Its value being intrinsically connected to the nature of electrode materials, we chose to focus on CuO thin films which are characterized by a theoretical volumetric capacity (426 µAh .cm-2.µm-1) in far larger than the one of conventional intercalation materials used today. Indeed, this material reacts with lithium according to a particular mechanism, referred as conversion reaction, inducing the formation of a multiphase nanostructured system with a high complexity. In the framework of this study, understanding of electrochemical and chemical mechanisms which take place during the cycling of copper oxide thin films (CuO) was the main objective. This one has required a fine characterization of the electrode active material and the generated interfaces (solid/solid interfaces and solid/electrolyte interface). These studies have been mainly carried out with X-ray Photoelectron Spectroscopy (XPS), Atomic Force Microscopy (AFM) and theoretical approaches based on quantum chemistry methods. The chemical and morphological properties of the cycled CuO thin films have been linked to their electrochemical behavior. An important influence of their initial structure and morphology was then evidenced
Gavanier, Beatrice. "Stability of thin film insertion electrodes." Thesis, University of Southampton, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.324003.
Повний текст джерелаLiao, Feng. "Relation entre caractéristiques morphologiques et chimiques interfaciales et comportement électrochimique de couches minces de sulfures métalliques pour batteries li-ion : = Relation between morphological and chemical interfacial characteristics and electrochemical properties of metallic sulfides thin films for lithium ion batteries." Paris 6, 2013. http://www.theses.fr/2013PA066126.
Повний текст джерелаSurface analytical techniques were combined to study the electrochemical lithiation, passivation and ageing mechanisms of transition metal sulfides (Fe1-xS (0≤x≤0. 07), Ni3S2 and Cu2S) as conversion-type negative electrode materials for Li-ion batteries. A thin film approach was applied by thermal sulfidation of metal substrate used as current collector. The results show reversible but incomplete conversion/deconversion with lithium. Discharge leads to surface passivation with formation of the solid electrolyte interphase (SEI) layer whose chemical composition, stability and thickness were followed during the first cycle and with repeated cycling. Swelling/shrinkage, typical for conversion-type materials, causes irreversible morphological modifications (cracks and pinholes) amplified by multi-cycling. A mechanistic model of the induced thin film electrode modifications including the electrolyte influence is proposed
Mui, Simon C. 1976. "Electrochemical kinetics of thin film vanadium pentoxide cathodes for lithium batteries." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/33607.
Повний текст джерелаIncludes bibliographical references (p. 147-154).
Electrochemical experiments were performed to investigate the processing-property-performance relations of thin film vanadium pentoxide cathodes used in lithium batteries. Variations in microstructures were achieved via sputtering and anneal treatments, resulting in films with different morphologies, grain size distributions, and orientations. Key findings included (1) grain size distributions largely did not affect the current rate performance of the cathodes. Rather, the film orientation and the ability to undergo rapid phase transformation were more vital to improving performance; (2) interfacial resistance and ohmic polarization were also dominant at the high current rates used (> 600 [mu]A/cm²) in addition to solid diffusion; and (3) optimization of thin film batteries requires that film thickness be < 500 nm to avoid diminishing returns in power and energy densities. Kinetic parameters including the transfer coefficient ([alpha] = 0.90± 0.05) and standard rate constant (k⁰ [approx.] 2 x 10⁻⁶ cm/s) for vanadium pentoxide films were quantified using slow scan DC cyclic voltammetry and AC cyclic voltammetry. The reaction rate was found to be potentially limiting at moderate to high current rates (> 200 [mu]A/cm²).
(cont.) An analysis of the wide variation in current-rate performance for different V₂0₅ architectures (including composite, nanofiber, and thin film) shows a convergence in results when the area of active material has been factored into the metric. This convergence suggests that either the reaction rate or interfacial resistance is limiting in V₂0₅ as opposed to diffusion.
by Simon C. Mui.
Ph.D.
Li, Chiung-Nan. "Microstructural stability of nanocrystalline LiCoO₂ cathode in lithium thin-film batteries." Diss., Restricted to subscribing institutions, 2008. http://proquest.umi.com/pqdweb?did=1580828921&sid=1&Fmt=2&clientId=1564&RQT=309&VName=PQD.
Повний текст джерелаMoulki, Hakim. "Matériaux et dispositifs électrochromes à base de NiO modifié en couches minces." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2013. http://tel.archives-ouvertes.fr/tel-00989588.
Повний текст джерелаShi, Z., L. Lü, and Gerbrand Ceder. "Solid State Thin Film Lithium Microbatteries." 2003. http://hdl.handle.net/1721.1/3672.
Повний текст джерелаSingapore-MIT Alliance (SMA)
Chen, Jing. "Electrical and switching characteristics of lithium niobate thin films." Thesis, 1996. http://hdl.handle.net/1911/14058.
Повний текст джерелаStone, Barbara Ann. "Physical characterization of lithium niobate thin films on silicon substrates." Thesis, 1988. http://hdl.handle.net/1911/13320.
Повний текст джерелаWang, Shunxi. "Lithium niobate thin films on diamond substrates for SAW devices." Thesis, 2001. http://hdl.handle.net/1911/18047.
Повний текст джерелаCHOLAPRANEE, TARA. "INVESTIGATION OF LITHIUM - NIOBIUM TRIOXIDE THIN FILMS IN MIS STRUCTURE (FERROELECTRIC)." Thesis, 1986. http://hdl.handle.net/1911/15964.
Повний текст джерелаHwang, Fu-Tsai, and 黃富財. "The Study of Lithium Niobate Thin Films by RF Sputtering Method." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/35494896255427060073.
Повний текст джерела國立中央大學
光電科學研究所
94
Abstract Very high quality LiNbO3 films were deposited on both silicon and quartz substrates for the applications of surface acoustic wave and optical waveguide by RF magnetron sputtering. We have investigated the dependence of the surface morphology, texture, crystallinity, thickness, refractive index, extinction coefficient properties with the sputtering parameters and annealing process. The optimum deposition temperature was measured by differential thermal analysis. The crystallinity was examined by x-ray and low angle x-ray diffractometer (XRD). The roughness of LiNbO3 thin films was examined by atomic force microscopy (AFM). AFM and XRD measurements were used to investigate the mechanisms of the variation in the surface morphology and crystallinity of LiNbO3 thin films.The optimum deposition temperature was found to be about 575℃. In this investigation the optimum ratio of the mass flow Ar/O2 was found to be about 1:1. Simultaneously, the RF power necessary for texture was found to be about 100W. The thickness, refractive index and extinction coefficient of LiNbO3 thin films were examined by ellipsometer. We have found the refractive index (n) is 2.2 (at 632.8nm), which is identical with the parameter of LiNbO3 ever reported. At the same time, the extinction coefficient of LiNbO3 thin films approachs to zero , represents that these thin films are suitable for optical waveguides.
Kim, Yoon Gu. "Plasma-assisted directed vapor deposition for synthesizing lithium phosphorus oxynitride thin films /." 2008. http://wwwlib.umi.com/dissertations/fullcit/3327009.
Повний текст джерелаAn-Chi, Huang, and 黃安祺. "The Study of Lithium Niobate High Dielectric Thin Films by RF Sputtering." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/52542511711495769396.
Повний текст джерела國立雲林科技大學
電子與資訊工程技術研究所
86
In this thesis, Lithium Niobate (LiNbO3) thin films were deposited by radio-frequency (RF) magnetron sputtering. The material and electric properties of the deposited LiNbO3 films were investigated. Lithium Niobate thin films were prepared on p-type Si (100) substrates. Post-deposited thermal treatments with various conditions were applied to the LiNbO3 films. Al/LiNbO3/Si (MIS) structure was fabricated to measure the electrical properties. LiNbO3 films were investigated from the viewpoint of leakage current density, dielectric constant and dielectric breakdown strength. According to the C-V and I-V measurements, the dielectric constant was estimated to be 41 and the leakage current density was observed to be 5×10-7 A/cm2 at 1.5 V bias for the 50-nm-thick LiNbO3 film annealed at 600℃, 30 minutes in N2 ambient. The dielectric breakdown strength is as high as 28 MV/cm at 25℃. At the electric field E = 1 MV/cm, TBD is determined to be about 12 years.
Zhu, Jie. "Processing and characterization of lithium niobate thin films for ferroelectric nonvolatile memory applications." Thesis, 2002. http://hdl.handle.net/1911/17566.
Повний текст джерелаWang, Xuguang. "Electrical characterizations of lithium niobate thin films in a metal-ferroelectric-semiconductor capacitor." Thesis, 2002. http://hdl.handle.net/1911/17559.
Повний текст джерелаLin, Albert Jian. "Lithium niobate thin films deposited on silicon substrates for SAW applications (surface acoustic wave)." Thesis, 1996. http://hdl.handle.net/1911/14063.
Повний текст джерелаShih-AnWang and 王時安. "Effects of dopants in silicon thin films on the performance of lithium-ion battery." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/24233670003477911679.
Повний текст джерела國立成功大學
材料科學及工程學系
104
Purified silicon without impurities is bound to exhibit low conductance. When pure silicon is employed as an active material for lithium-ion battery, the performance of the battery is always poor because of the low conductivity. To enhance the performance of silicon anode lithium-ion battery, we intend to investigate the doping effect in silicon on batteries performance. Our approach is conducted through silicon thin film deposited by electron beam evaporation, when silicon targets are prepared by grinding various type of silicon wafer, including undoped silicon, p-type silicon and n-type silicon into small pieces. We successfully deposit silicon films on copper substrate with good adhesion. Scanning Electron Microscopy, Multipurpose X-Ray Thin-Film Diffractometer and Transmission Electron Microscopy are used to investigate the crystallinity of the as-deposited silicon films. Secondary Ion Mass Spectrometer is employed to confirm the existence and distribution of impurities in the silicon films. Four-point probe measurement method is used to measure the resistance of the as-deposited silicon thin films. After finishing material characterization, lithium metal is adopted as reference electrode, while silicon thin film is taken as test electrode. Coin cells is studied by electrochemical test to study doping effect by observing battery performance. Electrochemical impedance spectroscopy is also used to measure the impedance change between 20cycles and 200cycles of silicon anode coin cell. The coin cells after of 3cycles and 100cycles are dissembled to studied the morphology change of silicon active materials during charge and discharge.