关键词: 锂离子电池;硅负极;核壳结构设计;循环稳定性;复合材料

Abstract: Silicon is regarded as the anode material for lithium -ion battery due to its exceptional capacity which is about 10 times that of the commercial graphite.However, the dramatic volume change during lithiation /delithiation processes triggered a series of detrimental consequences , leading to peeling off of active silicon from the current collector and destruction and regeneration of solid electrolyte interphase (SEI) layer, and then very poor cyclic stability.In order to relieve these detrimental effects, much work has been devoted to the structural design of silicon based materials .The related researches on core-shell structure silicon-based anodes are summarized.The prominent features of different structure design are discussed.The effects of different components to volume change of electrode materials during lithiation process are analyzed.The preparation methods and electrochemical properties of some typical silicon structures are presented.The potential problems for the core-shell structure design of silicon anode materials are analyzed, and the future development direction is also proposed .

Key words: lithium-ion batteries;silicon anode;core-shell structure design;cycling stability;composite