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Improved Cycling Ability of Silicon-Graphite Composite Anode Materials through the SEI Control
김재람,조현탁,( Nguyen Dan Thien ),강길구,전도만,양아름,송승완 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
Silicon-graphite composites has been considered as promising anode materials for higher energy density Li-ion batteries because of larger theoretical specific capacity of silicon than currently commercialized graphite. They, however, suffer from a large volume change during lithiation and delithiation, resulting in the particle cracking, an instability of the solid electrolyte interphase (SEI) and finally leading to poor cycle life. In order to solve the problems, several strategies in the aspects of improved electrical conductivity and buffering effect of volume change have been developed, which are the fabrication of silicon composites with carbon materials and the use of functional binder and electrolyte additives. Here, we focus on the control of electrode-electrolyte interfacial reaction and the formation of a stable SEI layer using various additives. The influence of SEI stability on cycling performance of silicon-graphite composite anodes would be discussed in the meeting.