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Studies on Lithium-ion Transfer at Interface between Lithium-containing Transition Metal Oxide Electrodes and Ionic Liquids / リチウム含有遷移金属酸化物電極/イオン液体界面におけるリチウムイオン移動に関する研究Ishihara, Yuya 25 March 2013 (has links)
Kyoto University (京都大学) / 0048 / 新制・課程博士 / 博士(工学) / 甲第17587号 / 工博第3746号 / 新制||工||1571(附属図書館) / 30353 / 京都大学大学院工学研究科物質エネルギー化学専攻 / (主査)教授 安部 武志, 教授 陰山 洋, 教授 阿部 竜 / 学位規則第4条第1項該当
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Boron nitride nanotube-modified silicon oxycarbide ceramic composite: synthesis, characterization and applications in electrochemical energy storageAbass, Monsuru A. January 1900 (has links)
Master of Science / Department of Mechanical and Nuclear Engineering / Gurpreet Singh / Polymer-derived ceramics (PDCs) such as silicon oxycarbide (SiOC) have shown promise as an electrode material for rechargeable Li-ion batteries (LIBs) owing to the synergy between its disordered carbon phase and hybrid bonds of silicon with oxygen and carbon. In addition to their unique structure, PDCs are known for their high surface area (~822.7 m² g⁻¹), which makes them potential candidates for supercapacitor applications. However, low electrical conductivity, voltage hysteresis, and first cycle lithium irreversibility have hindered their introduction into commercial devices. One approach to improving charge storage capacity is by interfacing the preceramic polymer with boron or aluminium prior pyrolysis. Recent research has shown that chemical interfacing with elemental boron, bulk boron powders and even exfoliated sheets of boron nitride leads to enhancements in thermal and electronic properties of the ceramic.
This thesis reports the synthesis of a new type of PDC composite comprising of SiOC embedded with boron nitride nanotubes (BNNTs). This was achieved through the introduction of BNNT in SiOC pre-ceramic polymer at varying wt.% loading (0.25, 0.5 and 2.0 wt.%) followed by thermolysis at high temperature. Electron microscopy and a range of spectroscopy techniques were employed to confirm the polymer-to-ceramic transformation and presence of disordered carbon phase. Transmission electron microscopy confirmed the tubular morphology of BNNT in the composite. To test the material for electrochemical applications, the powders were then made into free-standing paper-like electrodes with reduced graphene oxide (rGO) acting as support material.
The synthesized free-standing electrodes were characterized and tested as electrochemical energy storage materials for LIBs and symmetric supercapacitor applications. Among the SiOC-BNNT composite paper tested as anode materials for LIBs, the 0.25 wt.% BNNT composite paper demonstrated the highest first cycle lithiation capacity corresponding to 812 mAh g⁻¹ (at a current density of 100 mA g⁻¹) with a stable charge capacity of 238 mAh g⁻¹ when asymmetrically cycled after 25 cycles. On the contrary, the 0.5 wt.% BNNT composite paper demonstrated the highest specific capacitance corresponding to 78.93 F g⁻¹ at a current density of 1 A g⁻¹ and a cyclic retention of 86% after 185 cycles. This study shows that the free carbon content of SiOC-BNNT ceramic composite can be rationally modified by varying the wt.% of BNNT. As such, the paper composite can be used as an electrode material for electrochemical energy storage.
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Tin Oxide Based Composites Derived Using Electrostatic Spray Deposition Technique as Anodes for Li-Ion BatteriesDhanabalan, Abirami 08 November 2012 (has links)
Recent advances in the electric & hybrid electric vehicles and rapid developments in the electronic devices have increased the demand for high power and high energy density lithium ion batteries. Graphite (theoretical specific capacity: 372 mAh/g) used in commercial anodes cannot meet these demands. Amorphous SnO2 anodes (theoretical specific capacity: 781 mAh/g) have been proposed as alternative anode materials. But these materials have poor conductivity, undergo a large volume change during charging and discharging, large irreversible capacity loss leading to poor cycle performances.
To solve the issues related to SnO2 anodes, we propose to synthesize porous SnO2 composites using electrostatic spray deposition technique. First, porous SnO2/CNT composites were fabricated and the effects of the deposition temperature (200,250, 300 oC) & CNT content (10, 20, 30, 40 wt %) on the electrochemical performance of the anodes were studied. Compared to pure SnO2 and pure CNT, the composite materials as anodes showed better discharge capacity and cyclability. 30 wt% CNT content and 250 oC deposition temperature were found to be the optimal conditions with regard to energy capacity whereas the sample with 20% CNT deposited at 250 oC exhibited good capacity retention. This can be ascribed to the porous nature of the anodes and the improvement in the conductivity by the addition of CNT. Electrochemical impedance spectroscopy studies were carried out to study in detail the change in the surface film resistance with cycling. By fitting EIS data to an equivalent circuit model, the values of the circuit components, which represent surface film resistance, were obtained. The higher the CNT content in the composite, lower the change in surface film resistance at certain voltage upon cycling. The surface resistance increased with the depth of discharge and decreased slightly at fully lithiated state.
Graphene was also added to improve the performance of pure SnO2 anodes. The composites heated at 280 oC showed better energy capacity and energy density. The specific capacities of as deposited and post heat-treated samples were 534 and 737 mAh/g after 70 cycles. At the 70th cycle, the energy density of the composites at 195 °C and 280 °C were 1240 and 1760 Wh/kg, respectively, which are much higher than the commercially used graphite electrodes (37.2-74.4 Wh/kg). Both SnO2/CNTand SnO2/grapheme based composites with improved energy densities and capacities than pure SnO2 can make a significant impact on the development of new batteries for electric vehicles and portable electronics applications.
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Elucidation of Reaction Mechanism for High Energy Cathode Materials in Lithium Ion Battery using Advanced Analysis Technologies / 高度解析技術を用いたリチウムイオン電池用高エネルギー正極材料の反応メカニズム解明Komatsu, Hideyuki 25 March 2019 (has links)
京都大学 / 0048 / 新制・課程博士 / 博士(人間・環境学) / 甲第21876号 / 人博第905号 / 新制||人||216(附属図書館) / 2018||人博||905(吉田南総合図書館) / 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 吉田 鉄平 / 学位規則第4条第1項該当 / Doctor of Human and Environmental Studies / Kyoto University / DFAM
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Improvement of lithium-ion battery performance by control of electrode electrolyte interface / 電極電解質界面の制御によるリチウムイオン二次電池の性能向上Kusachi, Yuki 23 March 2020 (has links)
京都大学 / 0048 / 新制・課程博士 / 博士(人間・環境学) / 甲第22547号 / 人博第950号 / 新制||人||226(附属図書館) / 2019||人博||950(吉田南総合図書館) / 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 吉田 寿雄, 准教授 戸﨑 充男 / 学位規則第4条第1項該当 / Doctor of Human and Environmental Studies / Kyoto University / DFAM
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Design Principles for High Energy Density Cathode Materials Using Anionic Redox Activity / アニオンレドックスを利用した高容量電極材料の設計指針Zhou, Yingying 23 March 2020 (has links)
京都大学 / 0048 / 新制・課程博士 / 博士(人間・環境学) / 甲第22548号 / 人博第951号 / 新制||人||226(附属図書館) / 2019||人博||951(吉田南総合図書館) / 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, 准教授 藤原 直樹 / 学位規則第4条第1項該当 / Doctor of Human and Environmental Studies / Kyoto University / DFAM
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Energy storage for peak shaving : Case study for the distribution grid in BjörnarboPeterson, Cornelius, Olsén Jonsson, Sofia January 2022 (has links)
Sala-Heby Energi Elnät is a supplier of electrical power for the communities of Sala, Heby, Morgongåva and Björnarbo in Uppland, Sweden. The electrical power grid in this area is currently facing several challenges. Bottlenecks and power shortages are some of them. As an expansion of the Swedish power grid lies many years in the future, there is a need for other solutions to these problems. Because of this, Sala-Heby Energi Elnät is looking at the prospect of installing an energy storage system in the small community of Björnarbo. This report investigates a number of the most commonly used energy storage options available today and concludes that the most suitable choice for Sala-Heby Energi Elnät would be lithium-ion batteries implemented in a battery energy storage system, a BESS. This report also focuses on how a BESS can reduce power peaks by using a method called peak shaving. The financial implications of implementing a BESS of this kind for this purpose are taken into account as well. The study shows that by utilising a BESS with an energy capacity of 500kWh, the power peaks can be reduced by peak shaving. This not only provides a solution to the capacity problem in Sala-Heby Energi Elnät’s power grid, but a BESS could also allow for them to reduce their power subscription to Vattenfall, Sweden’s electricity provider. This would allow Sala-Heby Energi Elnät to make some financial savings. However, a BESS of this type would be very expensive. The conclusion is that a BESS could manage the energy consumption by using peak shaving but will only be financially profitable in the long run for Sala-Heby Energi Elnät.
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Studies on Electrode-slurry for Lithium-ion Batteries / リチウムイオン電池電極用スラリーに関する研究Takeno, Mitsuhiro 23 May 2017 (has links)
京都大学 / 0048 / 新制・課程博士 / 博士(工学) / 甲第20580号 / 工博第4360号 / 新制||工||1678(附属図書館) / 京都大学大学院工学研究科物質エネルギー化学専攻 / (主査)教授 安部 武志, 教授 阿部 竜, 教授 作花 哲夫 / 学位規則第4条第1項該当 / Doctor of Philosophy (Engineering) / Kyoto University / DGAM
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Study on Interfacial Reaction between Graphite Negative Electrode and Electrolyte Solution in Lithium-Ion Battery / リチウムイオン電池における黒鉛負極と電解液の界面反応に関する研究Tsubouchi, Shigetaka 26 March 2018 (has links)
京都大学 / 0048 / 新制・課程博士 / 博士(工学) / 甲第21114号 / 工博第4478号 / 新制||工||1696(附属図書館) / 京都大学大学院工学研究科物質エネルギー化学専攻 / (主査)教授 安部 武志, 教授 作花 哲夫, 教授 陰山 洋 / 学位規則第4条第1項該当 / Doctor of Philosophy (Engineering) / Kyoto University / DGAM
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In situ infrared study on interfacial electrochemistry in energy storage devicesLiu, Cheng January 2020 (has links)
No description available.
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