이동현상론 Carbon Anode Materials for Lithium Ion Batteries

이동현상론 Carbon Anode Materials for Lithium Ion Batteries

[이동현상론] Carbon Anode Materials for Lithium Ion Batteries.pptx

목차 1.Problems of carbon anode lithium ion battery 2.Kinds of carbons a. Graphite -Coating by conductive materials -Advantages of Mild Oxidation of Graphite b. Other Carbons -Carbon & Si composite -Soft and Hard Carbon -CNT 3.Conclusion 4.Proposal 5.Reference 본문 Graphite Stacked graphene layers, crystalline. 0.335 nm spacing betwwen planes. About 10% volume expansion upon Li intercalaion Theoretical maximum capacity is 372mAl/g(LiC6) Coating by Conductive Materials The major effects and advantages No classical binder is required to prepare mechanically and electrochemically stable anodes. Irreversible capacity in the first cycle is decreased Example Polythiophene, Polypyrrole, Polyaniline. Coating by Conductive Materials There can be carbons which are not contacted with conducting additives. These carbons only occupies volume. 'dead volume' Stable conductivity can be achieved by coating Advantages of Mild Oxidation of Graphite What happens to Graphite? Nanochannels or micropores are made. Effects of Mild Oxidation. Micropores acts as 'reservoirs' for lithium ions storage. Prevent the graphite anode from expanding by lithium ion intercalation Si has theoretical capacity of 4200mAh/g Due to it's large volume change, pulverization can be occurred. Silicon has high-capacity but poor cycle stability Carbon has low-capacity but good cycle stability So silicon/carbon composites can have higher capacity than single carbon anode, and better cycle stability than single silicon anode. 참고문헌 1 copyright © Automotive Energy Supply Corporation.2007 2 Trends of R&D on Materials for High-power and Large-capacity Lithium-ion Batteries for Vehicles Applications NCE & TECHNOLOGY TRENDS, July 2010 , Hiroshi Kawamoto et al. 3 Development and implementation of a high temperature electrochemical cell for lithium batteries Electrochemistry Communications David Muñoz-Rojasa et al. 4 Study of lithium insertion in hard carbon made from cotton wool Journal of Power Sources 76(1998) 153~158 Emanuel Peled et al. 5 http://hanyangocw.hanyang.ac.kr/ocw/fusion-materials 6 Kyomin Shina, Dae-Jin Parka, Hyung-Seok Lima, Yang-Kook Suna, Kyung-Do Suha, 「Synthesis of silicon/carbon, multi-core/shell microspheres using solution polymerization for a high performance Li ion battery」, Electrochimica Acta 58 (2011) 578 582 7 A review of application of carbon nanotubes for lithium ion battery anode material Charles de las Casas, Wenzhi Li 8 Y.P. Wu, E. Rahm, R. Hozle, 「Carbon anode materials for lithium ion batteries」, Journal of Power Sources 114 (2003) 228~236. 9 Mary L. Patterson, 「Anode materials for lithium ion batteries」, November 13 (2009). 키워드 이동현상론, Ion, Lithium, Carbon