Tesis sobre el tema "Sulfur cathode"
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Xiao, Yao. "Analysis for reaction mechanism of cathode materials for lithium-sulfur batteries". Doctoral thesis, Kyoto University, 2021. http://hdl.handle.net/2433/263747.
Texto completo新制・課程博士
博士(人間・環境学)
甲第23286号
人博第1001号
京都大学大学院人間・環境学研究科相関環境学専攻
(主査)教授 内本 喜晴, 教授 田部 勢津久, 教授 高木 紀明
学位規則第4条第1項該当
Doctor of Human and Environmental Studies
Kyoto University
DFAM
Campbell, Christopher. "The Effect of Pressure on Cathode Performance in the Lithium Sulfur Battery". Thesis, The University of Arizona, 2013. http://hdl.handle.net/10150/312669.
Texto completoThieme, Sören, Jan Brückner, Andreas Meier, Ingolf Bauer, Katharina Gruber, Jörg Kaspar, Alexandra Helmer, Holger Althues, Martin Schmuck y Stefan Kaskel. "A lithium–sulfur full cell with ultralong cycle life: influence of cathode structure and polysulfide additive". Royal Society of Chemistry, 2015. https://tud.qucosa.de/id/qucosa%3A36251.
Texto completoHao, Yong. "Sulfur Based Electrode Materials For Secondary Batteries". FIU Digital Commons, 2016. http://digitalcommons.fiu.edu/etd/2582.
Texto completoOgihara, Hideki [Verfasser] y M. J. [Akademischer Betreuer] Hoffmann. "Lithium Titanate Ceramic System as Electronic and Li-ion Mixed Conductors for Cathode Matrix in Lithium-Sulfur Battery / Hideki Ogihara. Betreuer: M. J. Hoffmann". Karlsruhe : KIT-Bibliothek, 2012. http://d-nb.info/1025887476/34.
Texto completoPalanisamy, Asha. "High Energy Density Battery for Wearable Electronics and Sensors". University of Dayton / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1480511507315736.
Texto completoWang, Xiaoxiang. "Structural and defects engineering of electrode materials for enhanced supercapacitors performance". Thesis, Queensland University of Technology, 2021. https://eprints.qut.edu.au/208154/2/Xiaoxiang_Wang_Thesis.pdf.
Texto completoBenešová, Petra. "Stanovení nejvhodnějšího poměru katodových materiálů pro systém lithium-síra". Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2021. http://www.nusl.cz/ntk/nusl-442427.
Texto completoBaughman, Jessi Alan. "Solid-State NMR Characterization of Polymeric and Inorganic Materials". University of Akron / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=akron1428198096.
Texto completoDörfler, Susanne, Markus Hagen, Holger Althues, Jens Tübke, Stefan Kaskel y Michael J. Hoffmann. "High capacity vertical aligned carbon nanotube/sulfur composite cathodes for lithium–sulfur batteries". Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-138906.
Texto completoDieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich
Dörfler, Susanne, Markus Hagen, Holger Althues, Jens Tübke, Stefan Kaskel y Michael J. Hoffmann. "High capacity vertical aligned carbon nanotube/sulfur composite cathodes for lithium–sulfur batteries". Royal Society of Chemistry, 2012. https://tud.qucosa.de/id/qucosa%3A27791.
Texto completoDieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich.
Lubarska-Radziejewska, Iwona Agata. "Investigation of micro-structure of sulphur cathode in lithium-sulphur batteries". Thesis, University of Cambridge, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.609447.
Texto completoShan, Jieqiong, Yuxin Liu, Yuezeng Su, Ping Liu, Xiaodong Zhuang, Dongqing Wu, Fan Zhang y Xinliang Feng. "Graphene-directed two-dimensional porous carbon frameworks for high-performance lithium–sulfur battery cathodes". Royal Society of Chemistry, 2016. https://tud.qucosa.de/id/qucosa%3A36281.
Texto completoLee, Jung Tae. "Chalcogen-carbon nanocomposite cathodes for rechargeable lithium batteries". Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/53064.
Texto completoZhao, Teng. "Development of new cathodic interlayers with nano-architectures for lithium-sulfur batteries". Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/275684.
Texto completoXu, Yanghai. "Matériaux de cathode et électrolytes solides en sulfures pour batteries au lithium". Thesis, Rennes 1, 2017. http://www.theses.fr/2017REN1S094/document.
Texto completoLithium-air and Li-S batteries are promising techniques for high power density storage. The main challenges are to develop solid electrolyte with high ionic conductivity and highly efficient catalyzed cathode. In this work, highly conductive carbon aerogels with dual-pore structure have been synthesized by using sol-gel method, and have been used as air cathode in Lithium-air batteries. This dual- pore structure can provide two types of channels for storing discharge products and for gas-liquid diffusion, thus reducing the risk of clogging. Nearly 100 cycles with a capacity of 0.4mAh at a current density of 0.1 mA cm-2 have been obtained. For developing stable and highly conductive solid electrolyte, sulfides, especially Li4SnS4 and its phosphorous derivative Li10SnP2S12 have been particularly investigated. These compounds have been synthesized by using a two-step technique including ball milling and a relatively low temperature heat treatment. The heat treatment has been carefully optimized in order to enhance the ionic conductivity. The best-obtained conductivity is 8.27×10-4 S/cm at 25°C and the electrolytes show high electrochemical stability over a wide working range of 0.5 – 7V. Thin films have also been deposited by using the sputtering technique, with generally improved ionic conductivity. The performance of the Li-S batteries assembled with these bulk electrolytes is still to be improved, particularly by improving the ionic conductivity of the electrolyte
Oschatz, Martin, J. T. Lee, H. Kim, Lars Borchardt, W. I. Cho, C. Ziegler, Stefan Kaskel, G. Yushin y Winfrid Nickel. "Micro- and mesoporous carbide-derived carbon prepared by a sacrificial template method in high performance lithium sulfur battery cathodes". Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-156825.
Texto completoGu, Xingxing. "Environmentally-benign, Porous and Conductive Carbon Materials for Lithium-Sulphur Batteries". Thesis, Griffith University, 2017. http://hdl.handle.net/10072/366860.
Texto completoThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
Griffith School of Environment
Science, Environment, Engineering and Technology
Full Text
VERSACI, DANIELE. "Materials for high energy Li-ion and post Li-ion batteries". Doctoral thesis, Politecnico di Torino, 2021. http://hdl.handle.net/11583/2896992.
Texto completoПолутренко, М. С. "Наукові основи розроблення біостійких протикорозійних покриттів для підвищення рівня екологічної безпеки підземних нафтогазопроводів". Thesis, Івано-Франківський національний технічний університет нафти і газу, 2012. http://elar.nung.edu.ua/handle/123456789/4426.
Texto completoДиссертация посвящена решению актуальной научно-технологической проблемы повышения уровня экологической безопасности эксплуатации подземных нефтегазопроводов, вследствие уменьшения отказов в их работе, за счет разработки и внедрения в практику переизоляции трубопроводов инновационных биостойких противокоррозионных покрытий на проблемных участках, где возможен риск развития микробиологической коррозии под действием коррозионнопасных почвенных микроорганизмов. Проведен анализ отказов подземных нефтегазопроводов с учетом биологического фактора и их влияния на окружающую среду. Научно обоснован выбор ингибиторов коррозии (биоцидов) для модификации праймеров и мастик на битумно-полимерной основе. Впервые изучено влияние гетеротрофных бактерий, выделенных из поврежденного битумного покрытия МГ, на устойчивость модифицированных битумно-полимерных мастик. Установлены закономерности влияния природы ингибитора и состава электролита на водонасыщение базовой и модифицированных мастик в длительном эксперименте. Полученные количественные зависимости водонасыщения базовой и модифицированных мастик от природы ингибитора и состава электролита приводят к повышению диэлектрических свойств изоляционных покрытий и предотвращают возникновение экологических катастроф при использовании модифицированных мастик в болотных, заиленных грунтах, из-за повреждения металла подземных нефтегазопроводов вследствие развития биокоррозии. Проведен комплекс исследований по воздействию четвертичных азотсодержащих ингибиторов коррозии и производных диоксодекагидроакридина на рост и ферментативную активность бактерий цикла серы и установлен механизм блокировки гидрогеназной реакции коррозионноактивных сульфатредуцирующих бактерий. Впервые установлена биорезистентность ингибиторов коррозии «Г» и «К» в длительном эксперименте, использование модифицированных противокоррозионных покрытий с их участием будет способствовать замедлению деградации изоляционного покрытия в процессе эксплуатации. Впервые дана теоретическая оценка биорезистентности производных диоксодскагидроакридина, исходя из значений энергии химической связи между углеродными атомами фенольного ядра и атомами модифицирующих элементов, что дает основание рассматривать их перспективными составляющими полифункциональных ингибирующих систем. Проведено исследование воздействия производных диоксодскагидроакридина и четвертичных азотсодержащих соединений (ЧАС) на ацидофобные тионовые бактерии Thiobacillus sp, среди которых максимально эффективными по отношению к этой группе микроорганизмов оказались ингибиторы 1/0 среди производных диоксодскагидроакридина и ингибитор «Ж» среди (ЧАС), которые проявили степень блокировки роста 95,8 и 97,1% соответственно и почти на 90% скорость коррозии стальных образцов, комплексное использование которых позволит обеспечить невозможность микробной коллонизации поверхности подземных нефтегазопроводов и повысит уровень экологической безопасности на протяжении длительного времени их эксплуатации. Впервые получены биостойкие противокоррозионные покрытия на битумно-полимерной основе (патенты №№ 82775, 84769, 89709), которые успешно прошли испытания в условиях УМГ «Прикарпаттрансгаз», внедрение которых в практику переизоляции действующих трубопроводов повысит уровень экологической безопасности их эксплуатации. Получило дальнейшее развитие изучение физиолого-биохимических свойств микроорганизмов разных экологотрофических групп, которые были выделены из поврежденных праймеров и битумного покрытия магистральных газопроводов, проложенных в грунтах различной коррозионной активности. Полученные результаты составляют основу для разработки современной зкобиотехнологии защиты от микробной коррозии, внедрение которой повысит одновременно производительность и качество ремонтных операций, что приведет к уменьшению отказов и обеспечит экологическую безопасность трубопроводных систем Украины (патент № 18222/ЗА/12).
The thesis is devoted to the solution of current scientific and applied problem devoted to the increase of ecological safety level of subsurface oil and gas pipelines exploitation by reducing failures in their work due to the development and introduction of pipeline reisolation by biostable innovative anticorrosive coatings on the problem areas, where there is a possible risk of microbiological corrosion development under the influence of soil microorganisms, which may cause corrosion. The analysis has been conducted of the subsurface oil and gas pipeline failures taking into account the biological factor and their influence on environment. The choice of corrosion inhibitors (biocides) applied for the modification of asphalt-polymer based primers and mastic has been scientifically substantiated. Complex research has been carried out to determine the corrosion activity of soils at the sites of Main Gaspipelines "Pasichna-Dolyna", "Pasichna-Tysmenytsia" and "Rozdilna-Izmail". During long-term experiment there has been determined the influence regularities of inhibitor and electrolyte composition nature on water saturation of base and modified mastics. A set of studies have been carried out devoted to the influence of nitrogen-containing corrosive inhibitors on the growth and enzyme activity of sulfur cycle bacteria and corrosion rate of steel samples. The blocking mechanism of hydrogenase reaction of sulfate-reducing and thionic bacteria has been established. It is the first time that bioresistance of corrosion inhibitors “G” and “K” has been proved. Besides, theoretical estimation of bioresistance of dioxodecahydroacridine derivatives has been given. It is also the first time when biostable anticorrosive coatings on the asphalt-polymer basis have been developed (Patents №№ 82775, 84769, 89709). The latter have been successfully tested within the conditions of the Department of Main Gas Pipelines “Prykarpattransgas”. The innovative solution has been proposed of removing locally situated undamaged isolation and damaged primer with the application of ecobiotechnology (Patent № 18222/3 А/12).
Ma, Xin-Hui y 馬心惠. "Synthesis and Characterization of High Sulfur Content Cathode For Lithium Sulfur Batteries". Thesis, 2015. http://ndltd.ncl.edu.tw/handle/84959731755023448499.
Texto completo國立臺灣大學
化學工程學研究所
103
Nowadays, lithium-ion batteries (LIBs) are extensively applied in numerous portable devices such as smart-phones and laptops. However, current LIBs based on the conventional intercalation mechanism cannot meet the requirements of the electronics industry and electric vehicles. Therefore, it is extremely urgent to seek for systems with a significant reduction in cost and increase in capacity and energy density. Among various promising candidates, lithium–sulfur (Li–S) batteries with a high theoretical capacity are very attractive. This study aims at significantly raising the sulfur content of active material, decorating the electrode material and influence of polymer film in Li-S battery. Firstly, in order to increase the sulfur content of the active material, the synthesis of the sulfur carbon nanocomposite material was introduced by two different methods which were vacuum heating and anti-solvent heating methods. Except for the advantages that less sulfur particles left outside the pores of carbon, vacuum heating method encountered a limitation of sulfur content in the S-C nanocomposite material, due to the calcination temperature and carbon pore volume. Therefore, high sulfur content nanocomposite material could be synthesized by another method, the anti-solvent heating method. Anti-solvent processes are largely used in the industry, which were based on the polarity of two solvents immiscible to each other. Furthermore, to enhance the cycling stability and rate capability, the surface modified Al foil was applied as the current collector, especially for the long-term cycling at high current density. From the electrochemical performance, particularly the c-rate performance, the obvious differences of the initial reversible capacity and polarization between using the graphite coated Al foil and without coating could be observed. The favorable performance obtained by using the conductive material coated on Al foil demonstrated that graphite was a promising material for enhancing the electrochemical performance at higher current density. Hence, the combination of anti-solvent heating method and graphite coated Al foil was a feasible approach to test the higher sulfur content Li-S batteries at high current density for a long-term cycles. Based on the previous work, the use of a Nafion-ionomer film in Li-S battery could efficiently confine the polysulfides. Therefore, a novel separator coating with a Nafion polymer film was prepared by dipping that was used in high sulfur content (75 wt.%) Li-S batteries. The S-C nanocomposite of 75wt% sulfur content featuring a Nafion coated separator exhibited an initial capacity of 1060 mAh g-1 at 0.2 C, and the discharge capacity declined slowly, to 650 mAh g-1, after 100 cycles. Even at high c-rate of 1 C, the cell with Nafion-coated separator presented a reversible capacity of 590 mAh g-1 after 200 cycles which was superior than that without Nafion-coated separator. The Nafion-coated separator also improved Coulombic efficiency of high sulfur content Li-S cells at various current densities. The Nafion polymer coated separator displayed a structure of few small and uniform pores that allowed penetration of lithium-ions transmission, meanwhile, it could effectively prevented polysulfide anions transporting in the electrolyte, as well. It is demonstrated from the electrochemical performance that the Nafion-coated separator was quite effective in reducing shuttle effect, enhancing the stability and the reversibility of the electrode.
Pang, Quanquan. "Nanostructured Non-carbonaceous Materials for Improvement of Sulfur Cathode in Lithium-Sulfur Battery". Thesis, 2014. http://hdl.handle.net/10012/8362.
Texto completoZhang, Yongguang. "Sulfur based Composite Cathode Materials for Rechargeable Lithium Batteries". Thesis, 2013. http://hdl.handle.net/10012/7769.
Texto completoZegeye, Tilahun Awoke y Tilahun Awoke Zegeye. "Design, Characterization, and Fabrication of Sulfur Nanocomposite Cathode Material for High Performance Lithium-Sulfur Batteries". Thesis, 2016. http://ndltd.ncl.edu.tw/handle/31829109393052241514.
Texto completo國立臺灣科技大學
材料科學與工程系
105
In the field of lithium-sulfur (Li-S) battery, intense research has been made in the past decades to find high capacity, long cycle life, improved safety, high rate capability, and high sulfur loaded cathode material for Li-S batteries to be applicable for commercialization. Although significant achievements have been established, problems that hindered real applications of Li-S batteries have not been fully resolved. Therefore, this dissertation focused on the design of sulfur nanocomposite cathode material for high performance Li-S batteries and characterizing their property through various spectroscopic and microscopic techniques followed by measuring their performance to be suitable for real application after coin cell fabrication. In the first part of this study, hybrid nanostructured microporous carbon-mesoporous carbon doped titanium dioxide/sulfur composite (MC-Meso C-doped TiO2/S) was we designed as a cathode material for Li-S batteries. The hybrid MC-Meso C-doped TiO2 host material was produced by a low-cost hydrothermal and annealing process. It found that the resulting conductive material showed dual microporous and mesoporous behavior, which enhanced the effective trapping of sulfur and polysulfides. The hybrid MC-Meso C-doped TiO2/S composite material possessed rutile TiO2 nanotube structure with successful carbon doping, while sulfur was uniformly distributed in the hybrid MC-Meso C-doped TiO2 composite materials after the melt-infusion process. Electrochemical measurements of the hybrid cathode material also showed improved cycling stability and rate performance with high sulfur loading (61.04 wt %). Moreover, the material delivered an initial discharge capacity of 802 mAh g-1 and maintained at 578 mAh g-1 with the coulombic efficiency greater than 97.1% after 140 cycles at 0.1 C iv rates. This improvement was thought to be attributed to the unique hybrid nanostructure of the MC-Meso C-doped TiO2 host and the good dispersion of sulfur in the narrow pores of the spherical microporous carbon (MC) and the Meso C-doped TiO2 nanotube support. Secondly, the novel nanocomposite cathode materials consisting of sulfur (80 wt%) embedded within nitrogen doped three-dimensional reduced graphene oxide (N-3D-rGO) was designed by a controllable sulfur impregnation method. Nitrogen doping helped to increase the surface area by ten times and pore volume by seven times from pristine graphene. These structural features allowed the cathode to accommodate more sulfur. Moreover, the cathode adsorbed polysulfides and prevented their detachment from host materials, thereby achieving stable cycle performance. The solution drop sulfur impregnation method provided uniform distribution of nanosized sulfur in a controlled manner. Furthermore, the cathode delivered high initial discharge capacities of 1042 mAhg-1 and 916 mAh g-1 at 0.2 C and 0.5 C with excellent capacity retention of 94.8% and 81.9% after 100 cycles respectively, with a low decay rate of 0.062% per cycle after 500 cycles. Thus, the combination of solution drop sulfur impregnation and nitrogen doping opens a new chapter for resolving capacity fading, as well as long cycling problems, and creates a new strategy to increase sulfur loading in controlled mechanism. In the final part of this dissertation, a novel design of dual-confined sulfur cathode with core-shell architecture, where sulfur (72.5 wt%) was first encapsulated in MC cores and embedded by graphene (G) shells was reported. Larger, soluble polysulfide intermediates (Li2Sx, 4≤x≤8) were trapped by G shells, which prevented the dissolution of soluble polysulfide intermediates into the organic electrolyte, so that a stable cycling v performance could be achieved. Moreover, the G shell created the hollow space in-between, which helped ensure the integrity of the hybrid cathode against the volume expansion upon cycling. On the other hand, MC confined smaller sulfur (S2-4) molecules within its small pores and suppressed the formation of soluble polysulfides. The resulting electrode delivered a high initial discharge capacity of 982 mAh g-1 with enhanced capacity retention of 85.4% after 100 cycles at 0.2 C rates. More importantly, the cathode exhibited a high discharge capacity of 886 mAh g-1, and maintained at 601 mAh g-1 after 500 cycles at 0.5 C with the coulombic efficiency of nearly 100%, which is the best performance among reported cycle stabilities.
GUO, JYUN-WEI y 郭俊威. "Hollow Nickel Oxide Microspheres Filled with Sulfur as the Cathode Materials for Lithium-Sulfur Battery". Thesis, 2019. http://ndltd.ncl.edu.tw/handle/9k8m87.
Texto completo國立高雄科技大學
化學工程與材料工程系
107
In this study, the hollow Ni(OH)2 microspheres (about 5~6 μm in diameter) composed of nanosheets were synthesized by hydrothermal synthesis method. Hollow nickel oxide microspheres were obtained by heating the Ni(OH)2 microspheres at different temperatures under air atmosphere. The hollow microspheres were filled with sulfur and then coated on the carbon paper as the composite cathode for lithium-sulfur battery. The advantage of this cathode was to use the hollow metal oxide microspheres that could offer high sulfur loading and reduce the shuttle reaction of lithium polysulfides, as compared with a pure sulfur cathode. The surface morphology, structure, pore size distribution, and electrochemical performance of the hollow microspheres were investigated. Results indicated that when the calcination temperature increased, the nanosheets became smaller. Transmission electron microscopy and isothermal adsorption and desorption curves revealed that the pore size distribution of hollow microspheres was significantly changed by the calcination process. Hollow NiO microspheres obtained at 400℃ exhibited bimodal pore size distribution including the mesopores and macropores. This unique structure could serve as a hosting matrix to facilitate the sulfur diffusion and capture the lithium polysulfide, leading to the suppression of shuttle effect and capacity degradation. The initial discharge capacity of the hollow microspheres/sulfur electrode using NiO (calcined at 400℃) could reach 1365 mAh g-1 at a current density of 0.2 C and 260 mAh g-1 at 5.0 C. After 75 charge/discharge cycles, the capacity retention of electrode was 96 %, and the Coulombic efficiency of the electrode remained high (about 98 %). As a whole, the hollow NiO microspheres with bimodal pore size distribution are promising cathode materials for application in lithium-sulfur batteries.
Li, Jing. "Development of sulfur-polyacrylonitrile/graphene composite cathode for lithium batteries". Thesis, 2013. http://hdl.handle.net/10012/7501.
Texto completoWu, Min. "Studies of Sulfur-based Cathode Materials for Rechargeable Lithium Batteries". Thesis, 2016. http://hdl.handle.net/1805/10889.
Texto completoDeveloping alternative cathodes with high capacity is critical for the next generation rechargeable batteries to meet the ever-increasing desires of global energy storage market. This thesis is focused on two sulfur-based cathode materials ranging from inorganic lithium sulfide to organotrisulfide. For lithium sulfide cathode, we developed a nano-Li2S/MWCNT paper electrode through solution filtration method, which involved a low temperature of 100 °C. The Li2S nanocrystals with a size less than 10 nm were formed uniformly in the pores of carbon paper network. These electrodes show an unprecedented low overpotential (0.1 V) in the first charges, also show high discharge capacities, good rate capability, and excellent cycling performance. This superior electrochemical performance makes them promising for use with lithium metal-free anodes in rechargeable Li–S batteries for practical applications. For organotrisulfide cathode, we use a small organotrisulfide compound, e.g. dimethyl trisulfide, to be a high capacity and high specific energy organosulfide cathode material for rechargeable lithium batteries. Based on XRD, XPS, SEM, and GC-MS analysis, we investigated the cell reaction mechanism. The redox reaction of DMTS is a 4e- process and the major discharge products are LiSCH3 and Li2S. The following cell reaction becomes quite complicated, apart from the major product DMTS, the high order organic polysulfide dimethyl tetrasulfide (DMTtS) and low order organic polysulfide dimethyl disulfide (DMDS) are also formed and charged/discharged in the following cycles. With a LiNO3 containing ether-based electrolyte, DMTS cell delivers an initial discharge capacity of 720 mAh g-1 and retains 74% of the initial capacity over 70 cycles with high DMTS loading of 6.7 mg cm-2 at C/10 rate. When the DMTS loading is increased to 11.3 mg cm-2, the specific energy is 1025 Wh kg-1 for the active materials (DMTS and lithium) and the specific energy is 229 Wh kg-1 for the cell including electrolyte. Adjusting on the organic group R in the organotrisulfide can achieve a group of high capacity cathode materials for rechargeable lithium batteries.
Bell, Michaela Elaine. "Novel organosulfur cathode materials for advanced lithium batteries". Thesis, 2018. https://doi.org/10.7912/C2FT0R.
Texto completoRecent innovations in portable electronics, electric vehicles and power generation by wind and solar have expanded the need for effcient battery storage. Lithium-ion batteries have been the frontline contender of battery storage yet are not able to match current demands. Alternatively, lithium-sulfur batteries are a promising technology to match the consumer demands. Elemental sulfur cathodes incur a variety of problems during cycling including the dissolution of intermediate lithium polysul- fides, an undesirable volume change (~ 80%) when completely reduced and a high dependence on liquid electrolyte, which quickly degrades the cell's available energy density. Due to these problems, the high theoretical capacity and energy density of lithium sulfur cells are unattainable. In this work, A new class of phenyl polysul- fides, C6H5SxC6H5(4 < x <6), are developed as liquid sulfur containing cathode materials. This technology was taken a step further to fulfill and emerging need for exible electronics in technology. Phenyl tetrasulfide (C6H5S4C6H5) was polymerized to form a high energy density battery with acute mobility. Lithium half-cell testing shows that phenyl hexasulfide (C6H5S6C6H5) can provide a specific capacity of 650mAh/g and capacity retention of 80% through 500 cycles at 1C rate along with superlative performance up to 10C. Furthermore, 1, 302W h/ kg and 1, 720W h/L are achievable at a low electrolyte/active material ratio. Electrochemical testing of polymer phenyl tetrasulfide reveals high specific capacities of 634mAh /g at 1C, while reaching 600mAh /g upon mechanical strain testing. This work introduces novel cathode materials for lithium-sulfur batteries and provides a new direction for the development of alternative high-capacity flexible cathode materials.
Chuang, Cheng-Chieh y 莊正傑. "A Flexible Sheet of Phosphorus-Sulfur/Graphene Composites with Super High Volumetric Capacity Cathode for Lithium-Sulfur Batteries". Thesis, 2018. http://ndltd.ncl.edu.tw/handle/4vacg2.
Texto completoYe, Chao. "Investigating Advanced Cathode Materials for Li/Na-S Batteries Experimentally and Theoretically". Thesis, 2019. http://hdl.handle.net/2440/124701.
Texto completoThesis (Ph.D.) -- University of Adelaide, School of Chemical Engineering & Advanced Materials, 2019
KANG, JIA-HAO y 康家豪. "Hydrothermal synthesis of a three-dimensional nitrogen-doped graphene cathode for lithium–sulfur batteries". Thesis, 2017. http://ndltd.ncl.edu.tw/handle/ct9j8c.
Texto completo國立高雄大學
應用化學系碩士班
106
Lithium-sulfur batteries with a high theoretical energy density are regarded as promising energy storage devices for electric vehicles and large-scale electricity storage. But their practical use is still hindered by several issues including dissolution of lithium polysulfides(LiPSS) in the electrolyte, large volume change between the sulfur (S) and lithiated phase(Li2S), low electronic conductivity of sulfur. In this work, three-dimensional nitrogen-doped graphene by hydrothermal synthesis, as a chemical immobilizer, was designed to bind LiPSS and stabilize sulfur in the cathode for high performance Li-S batteries. The incorporated ni-trogen dopants in the graphene network were found to have a strong binding effect on the LiPSs to improve electrochemical stability and promote fast electrochemical reaction kinetics. Here we report the three-dimensional N-doped graphene as cathode for lithium-sulfur batteries, and the initial discharge capacity is 1253 mAh/g, after 50 cycles, the capacity retention is 80.1%
SHIE, CHENG-JE y 謝承哲. "Amine-Functionalized Porous Carbon Nanofiber via Electrospinning for Cathode Material in Lithium Sulfur Batteries". Thesis, 2019. http://ndltd.ncl.edu.tw/handle/j6bmm7.
Texto completo國立高雄大學
應用化學系碩士班
108
Lithium–sulfur (Li–S) battery is considered to be a potential energy storage devices in next generation owing to its high theoretical energy density of 2600 Wh kg-1 and high theoretical capacity (1672 mA h g-1). But to achieve commercialization still overcome several issue, for example, the shuttle effect caused by polysulfide dissolved in electrolyte, large volume change of elemental sulfur during charge and discharge, and low conductivity of sulfur. The most serious problem is the shuttle effect, in order to solve this problem, we use the electrospun method to synthesis the porous cabon nanofiber and further modified with polyethyleneimine (PEI) by reflux method. The modified porous cabon nanofiber trap lithium polysulfides (LiPS) by physical adsorption and strong interaction between LiPS and amine groups to improve electrochemical stability. The products were characterized by XRD, XPS, SEM, Raman, BET and TEM. We also did the electrical analysis like AC impedance, discharge-charge test, cyclic voltammetry and RRDE.
HUANG, KAI-CHEN y 黃楷宸. "Sulfur doped phosphorus containing nickel oxidehexagonal nanorods as high performance cathode materials for supercapacitors". Thesis, 2018. http://ndltd.ncl.edu.tw/handle/74rw46.
Texto completo明志科技大學
材料工程系碩士班
106
In this study, the synthesis of sulfur doped phosphorus containing nickel oxide hexagonal nanorods on nickel foam (S-NiPO HNRDs /Ni foam) were synthesized by hydrothermal method as electrode materials with unique microstructure and enhanced electrochemistry performance in alkaline electrolyte. The S-NiPO HNRDs /Ni foam electrode owns lower electrochemical impedance compared with bare NiPO HNRDs /Ni foam substrate and exhibits exceptional capacitance performance with a high specific capacitance of 1288 F g-1 delivered at current density of 2 A g-1, while 944 F g−1 retained at 10 A g−1. In addition, the S-NiPO HNRDs // AC asymmtric supercapacit5ors (ASCs) displays a maximum energy density of 16.39 W kg-1 and maximum power density of 8000 W h kg-1.
Chang, Po-Chia y 張博嘉. "The electrochemical reaction mechanism of pyrite FeS2 as Cathode for Room Temperature Sodium-Sulfur Battery". Thesis, 2015. http://ndltd.ncl.edu.tw/handle/71292640543441077898.
Texto completo國立臺灣師範大學
化學系
103
Efficient electrical energy storage has attracted intense attention due to power demend in next generation of electric vehicles and stationary applications. Rechargeable battery has viewed as good approach for energy storage. To aspire the higher energy density than traditional lithium ion battery used wildly, room temperature sodium-sulfur batteries (RT Na-S batteries) are especially attractive because of their high specific energy. In this thesis, a iron pyrite FeS2 material was investigated as sulfur source in the cathode electrode of RT Na-S battery. We found that iron disulfide as cathode materials (FeS2/Na-S battery) exhibited first discharge and charge capacity of 1360 mAhg-1 and 1086 mAhg-1 at a current density of 50 mAg-1 with a suitable electrolyte and potential range. The irreversible capacity at first cycle is approximately 20%. The capacity of FeS2 still remained 745 mAh g-1 after 50th cycles. During rapid charge - discharge test, FeS2/Na-S battery showed a high capacity of 520 mAh g-1 at a current density of 8920 mAg-1. In the detailed characterization by Raman and X-ray absorption spectra, we found that No polysulfide was formed by sulfur in FeS2 reacting with sodium and dissolved in electrolyte, resulting in remaining good capacity retention. Overall results indicated that The FeS2 cathode materials used in RT Na-S battery exhibited long cycle performance, high Coulombic efficiency and good capacity retention at high charge-discharge rate.
Baltazar, Ana Luisa Pires. "Influence of different electrolyte compositions and a cathode protective layer on the performance of lithium-sulfur batteries". Master's thesis, 2012. http://hdl.handle.net/10216/68408.
Texto completoTese de mestrado integrado. Engenharia Química. Faculdade de Engenharia. Universidade do Porto. 2012
Baltazar, Ana Luisa Pires. "Influence of different electrolyte compositions and a cathode protective layer on the performance of lithium-sulfur batteries". Dissertação, 2012. http://hdl.handle.net/10216/68408.
Texto completoTese de mestrado integrado. Engenharia Química. Faculdade de Engenharia. Universidade do Porto. 2012
Usman, Zubair. "High-energy sustainable Lithium Sulfur batteries for electrical vehicles and renewable energy applications - Development of innovative electrodes". Doctoral thesis, 2019. http://hdl.handle.net/11583/2730561.
Texto completoKim, Baejung. "Non-Precious Cathode Electrocatalytic Materials for Zinc-Air Battery". Thesis, 2013. http://hdl.handle.net/10012/8102.
Texto completoTsai, Pei-Jung y 蔡沛容. "Investigation of the Electorchemical Properties of Lithium-Sulfur Batteries Using Ionic Conductor Li6.28Al0.24La3Zr2O12 as Additive in Cathode or Interlayer". Thesis, 2018. http://ndltd.ncl.edu.tw/handle/npx674.
Texto completo國立清華大學
材料科學工程學系
106
Due to the advantages of low cost, non-toxic and high theoretical specific capacity (1675 mAh/g), lithium-sulfur (Li-S) battery is regarded as the most promising candidate for the next generation rechargeable battery. Three main drawbacks resulting Li-S battery not being able to be widely used in market include the insulating nature of sulfur, 80% volume expansion and polysulfide shuttle mechanism. The dissolution of polysulfide into the electrolyte is the major reason for the capacity decay. Herein, we used Al3+ doped cubic Li7La3Zr2O12 (LLZO), which belongs to garnet-type lithium-ion conductor, as cathode additive and mixed with super P as the interlayer. The sulfur sources investigated are nano-sulfur and Ketjen black-S (KB-S) carbon-sulfur composite. The results of batteries with addition of LLZO as cathode additive and the nano-sulfur as active material, showed higher discharge specific capacities compared to those without LLZO. Because of the insulating nature of LLZO, the charge transfer resistance of batteries have increased with increasing amount of added LLZO. The other part is to apply LLZO-super P composite slurry on the Celgard PP separator as an interlayer between cathode and separator. The result illustrated that LLZO-super P interlayer could prolong the cycle life and enhance the electrochemical performance and the best promotion came from with the ratio LLZO/super P = 4 when it was applied with nano-sulfur active material. For KB-S active material, the carbon composition of KB-S had the best cooperation with 100% super P interlayer.
Bhargav, Amruth. "Development of Novel Cathodes for High Energy Density Lithium Batteries". Thesis, 2016. http://hdl.handle.net/1805/10785.
Texto completoLithium based batteries have become ubiquitous with our everyday life. They have propelled a generation of smart personal electronics and electric transport. Their use is now percolating to various fields as a source of energy to facilitate the operation of devices from nanoscale to mega scale. This need for a portable energy source has led to tremendous scientific interest in this field to develop electrochemical devices like batteries with higher capacities, longer cycle life and increased safety at a low cost. To this end, the research presented in this thesis focuses on two emerging and promising technologies called lithium-oxygen (Li-O₂) and lithium-sulfur (Li-S) batteries. These batteries can offer an order of magnitude higher capacities through cheap, environmentally safe and abundant elements, namely oxygen and sulfur. The first work introduces the concept of closed system lithium-oxygen batteries wherein the cell contains the discharge product of Li-O₂ batteries namely, lithium peroxide (Li₂O₂) as the starting active material. The reversibility of this system is analyzed along with its rate performance. The possible use of such a cathode in a full cell is explored. Also, this concept is used to verify if all the lithium can be extracted from the cathode in the first charge. In the following work, lithium peroxide is chemically synthesized and deposited in a carbon nanofiber matrix. This forms a free-standing cathode that shows high reversibility. It can be cycled up to 20 times, and while using capacity control protocol, a cycle life of 50 is obtained. The cause of cell degradation and failure is also analyzed. In the work on full cell lithium-sulfur system, a novel electrolyte is developed that can support reversible lithium insertion and extraction from a graphite anode. A method to deposit solid lithium polysulde is developed for the cathode. Coupling a lithiated graphite anode with the cathode using the new electrolyte yields a full cell whose performance is characterized and its post-mortem analysis yields information on the cell failure mechanism. Although still in their developmental stages, Li-O₂ and Li-S batteries hold great promise to be the next generation of lithium batteries, and these studies make a fundamental contribution towards novel cathode and cell architecture for these batteries.
TU, WAN-JUNG y 涂宛蓉. "Preparation of Amine-Functionalized 3D Body-Centered Cubic Carbon by Soft Template Method for Cathode Material of Lithium Sulfur Batteries". Thesis, 2018. http://ndltd.ncl.edu.tw/handle/d3ht6f.
Texto completo國立高雄大學
應用化學系碩士班
106
In this work, we successfully synthesized the highly ordered mesoporous 3D body-centered cubic carbon (C-FDU-16) via soft template method, using the triblock copolymer F127 as the structure-directing agent and resol as the carbon source. Furthermore, we adopted wet-impregnation method to prepared amine-functionalized 3D body-centered cubic carbon by impregnating highly ordered mesoporous 3D body-centered cubic carbon with polyethleneimine and utilize it for lithium-sulfur battery cathode material. We characterize amine-functionalized 3D body-centered cubic carbon by transmission electron microscopy (TEM) and surface area and porosimetry analyzer (BET) that it possess large surface area and periodic mesoporous structure advantaged properties. Electrochemical tests reveal that the amine-functionalized FDU-16/S with well-defined nanostructure delivers a high initial specific capacity up to 1267 mAh/g and a stable capacity of 1104 mAh/g after 20 cycles at 0.1 C. In addition, the amine-functionalized FDU-16/S exhibits high reversible capacity at high rates. The excellent electrochemical performance is attributed to specific and strong interaction between sulfur species and amine groups in PEI. In summary, we believe amine-functionalized 3D body-centered cubic carbon is a suitable and potential material for cathode material of lithium sulfur batteries.
Shih, Chih y 施奇. "A study of (LaSr)MO3(M=Co, Mn) as the cathode material of electrochemical double cell for the decomposition of sulfur dioxide and nitrogen oxides". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/34376384984365232452.
Texto completo國立清華大學
化學工程學系
102
Since the transportation as well as the factory boiler has been the main emission sources of nitrogen oxides(NOx) and sulfur dioxide (SO2), governments around the world adopt strict standards because of serious cases in air pollution. In today's processing technology, large amounts of reducing agent must be used, not only consumes the massive equipment cost but also has the secondary pollution concerns. The development of Electrochemical double cell(EDC) in our lab using Electromotive force(EMF) between cathode and anode to make NOx and SO2 decomposing on the catalyst surfaces in order to achieve emission reduction. Perovskite structure (La0.8Sr0.2) 0.95MnO3-δ (LSM) and La0.6Sr0.4CoO3-δ (LSC) with oxygen ion conductivity material Ce0.9Gd0.1O1.95 (GDC) as EDC's cathode material, nitrogen, oxygen, nitric oxide, sulfur dioxide, carbon dioxide and water as a component gases to simulate car exhaust or industrial emissions. By modulating the concentration of nitrogen oxides and sulfur dioxide between, we can learn more about these two kinds of materials for the catalytic activity of the reactants. In this study, we use LSC-GDC and LSM-GDC as the cathode of EDC,and the result show that LSC has a better activity on NOx while LSM has a better performance than LSC on SO2.
Cheng, Rung-Tze y 鄭融澤. "Porous carbon materials for lithium–sulfur battery cathodes". Thesis, 2016. http://ndltd.ncl.edu.tw/handle/46835740311438371308.
Texto completo國立中山大學
化學系研究所
104
We applied porous carbon materials to lithium–sulfur batteries and measured electrochemical properties in this thesis. First of all, we mixed polyacrylonitrile ( PAN ) and polymethylmathacrylate ( PMMA ) in different weight ratio then made nanofibers by electrospinning and formed porous carbon fiber by carbonization. The structure of porous carbon nanofibers were shown by scanning electron microscope ( SEM ) and transmission electron microscope ( TEM ), and the surface properties were analyzed by Brunauer Emmet Teller ( BET ) techniques. After that synthesized sulfur-porous carbon composite materials and defineded by X-ray diffraction ( XRD ). In electrochemical measurements show that the porous carbon materials can reduce the battery impedance effectively. When the specific surface area of porous carbon fiber increase, we can get better capacity at 0.1 C-rate. We also analyzed the electrochemical measurements of porous carbon sphere which from National Taipei University of Technology Prof. Chia-Chen Li. The results show the discharge capacity is 958 mAh/g at 0.1 C-rate.
Guo, Dong. "LITHIUM-SULFUR BATTERY DESIGN: CATHODES, SEPARATORS, AND LITHIUM METAL ANODES". Diss., 2021. http://hdl.handle.net/10754/669135.
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