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电化学(中英文) ›› 2009, Vol. 15 ›› Issue (1): 47-51.  doi: 10.61558/2993-074X.1953

• 研究论文 • 上一篇    下一篇

硅基复合材料的电化学特性

徐欣欣;杨军;   

  1. 上海交通大学化学化工学院;
  • 收稿日期:2009-02-28 修回日期:2009-02-28 出版日期:2009-02-28 发布日期:2009-02-28

Electrochemical Characteristics of Silicon-based Composites

XU Xin-xin,YANG Jun   

  1. (School of Chemistry of Chemical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China
  • Received:2009-02-28 Revised:2009-02-28 Published:2009-02-28 Online:2009-02-28

摘要: 将氧化亚硅,铝和石墨经过2步球磨盐酸刻蚀处理,再包覆碳,可制得纳米孔-S i/G/C复合材料,其比容量高达600 mAh/g,电化学循环性能稳定,但首次放电效率较低.氧化亚硅和铝球磨后再经高温热处理,可以促使氧化亚硅完全还原.高温下A l2O3产物的晶型结构由γ相转为稳定难溶的α相,硅/A l2O3复合材料难以刻蚀制孔,而硅/A l2O3/G/C复合材料则显示较高的首次放电效率但循环稳定性较差.

关键词: 多孔硅, 热处理, 负极材料, 锂离子电池

Abstract: The nano-porous Si/G/C composite was obtained by two-step ball milling with SiO,A1 and graphite,along with HCl acid etching followed by carbon incorparation.This composite demonstrated the reversible capacity of 600 mAh/g with excellent cycling stability,but low initial cycle efficiency is low.A high-temperature treatment after ball-milling of SiO and A1 could promote the complete reduction of SiO.However,the crystalline structure of Al2O3 product changed from γ-phase to α-phase,which it can no longer be etched by HCl.The Si/Al2O3/G/C composite exhibited higher efficiency at the first cycle but relatively poorer cyclability.

Key words: nano-porous Si, heat treatment, anode material, lithium ion battery

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