Micro-structured Si@Cu3Si@C ternary composite anodes for high-performance Li-ion batteries
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A micro-structured Si@Cu3Si@C ternary composite is designed to ease volume expansion of Si as well as to enhance the conductivity of the whole electrode. Structurally, Si particles with carbon shells are agglomerated to form a hierarchical micro-structured ternary component sphere. A benign initial coulombic efficiency (ICE) 70.5% with high reversible capacity after 200 cycles (1477 mAh g−1, 400 mA g−1) of Si@Cu3Si@C anode can be obtained to demonstrate the superiorities of this structure. This unique porous hierarchical structure can be helpful to facilitate the ions transmission and provide void spaces for stress releasing while improving the conductivity of Si. Carbon shells formed on the Si are available for improving the conductivity of Si electrode and easing some extra side reactions. Cu3Si alloy acts as a buffer to alleviate the volume expansion of Si. Thus, a comparable stable structure with high conductivity can be maintained for enhancing the performance of Si. In addition, a low vacuum carbonization process is also used for energy saving which might be adopted in other materials fabrication.
KeywordsMicro-structured Silicide buffer constitute Ternary composite Silicon anode Li-ion batteries
This work is sponsored by the Collaborative Innovation Centre of Suzhou Nano-Science and Technology, National Natural Science Foundation of China (No. 51771144, No. 21805221), Jiangsu Province Fundamental Research Grant (BK20160389), Suzhou City Key Industry Technological Innovation (Perspective Application Research) Grant (SYG201621), and Natural Science Foundation of Shaanxi Province (No. 2017JZ015).
- 21.Chen S, Chen Z, Xu X, Cao C, Xia M, Luo Y (2018) Scalable 2D mesoporous silicon nanosheets for high-performance lithium-ion battery anode. SmallGoogle Scholar