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Micro-structured Si@Cu3Si@C ternary composite anodes for high-performance Li-ion batteries

  • Hui Zhang
  • Hui XuEmail author
  • Xiaofei Lou
  • Hong Jin
  • Ping Zong
  • Shiwei Li
  • Yu Bai
  • Fei MaEmail author
Original Paper
  • 5 Downloads

Abstract

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.

Keywords

Micro-structured Silicide buffer constitute Ternary composite Silicon anode Li-ion batteries 

Notes

Funding information

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).

Supplementary material

11581_2019_3043_MOESM1_ESM.pdf (229 kb)
ESM 1 (PDF 229 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.State Key Laboratory for Mechanical Behaviour of MaterialsXi’an Jiaotong UniversityXi’anPeople’s Republic of China
  2. 2.Xi’an Jiaotong University Suzhou AcademySuzhouPeople’s Republic of China
  3. 3.School of Nano-Science and Nano-Engineering (Suzhou)Xi’an Jiaotong UniversitySuzhouPeople’s Republic of China

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