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Journal of Inorganic Materials

Journal of Inorganic Materials >

2008 , Vol. 23 >Issue 5: 917 - 922

DOI: https://doi.org/10.3724/SP.J.1077.2008.00917

Research Paper

Effects of Ball-Milling on Structure and Electrochemical Property of CA-SiO Composite

  • CHAO Ya-Jun ,
  • YUAN Xian-Xia ,
  • MA Zi-Feng ,
  • DENG Xiao-Yan ,
  • YU Wen-Li
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  • 1. Department of Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; 2. School of Materials and Environment Sciences, Qingdao University of Science & Technology, Qingdao 266042, China

Received date: 2007-11-07

  Revised date: 2007-11-28

  Online published: 2008-09-20

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Abstract

Carbon aerogel (CA)-SiO with excellent lithium insertion-extraction property could be prepared through ball-milling of carbon aerogel (CA) with SiO. Effects of ball-milling process including ball-milling time and ball-milling speed on structure and electrochemical property of CA-SiO composite were investigated. The results show that ball-milling of amorphous SiO with CA can crystallize Si with small particle size, the crystal size of Si increases with the extension of ball-milling time and the increase of ball-milling speed, and then decreases. The crystallization of Si can be improved by the extension of ball-milling time and the increase of ball-milling speed. However, ball-milling for too long time or at too high speed will result in transformation of crystal Si to amorphous. Little influence of ball-milling time and ball-milling speed is found on crystal size of C in the prepared CA-SiO, though ball-milling leads to some increase of C crystal size. CA-SiO has higher capacity and better cycling stability when the silicon within this material shows higher crystallization and smaller crystal size. In contrast, amorphous Si is disadvantageous for lithium insertion-extraction in CA-SiO which will lead to poorer cycling stability. The ball-milling speed of 400r/min and the ball-milling time of 10h are the best preparation parameters for CA-SiO used as anode material of lithium-ion battery.

Key words： ball-milling technique; CA-SiO composite; anode material; lithium-ion battery

Cite this article

CHAO Ya-Jun , YUAN Xian-Xia , MA Zi-Feng , DENG Xiao-Yan , YU Wen-Li . Effects of Ball-Milling on Structure and Electrochemical Property of CA-SiO Composite[J]. Journal of Inorganic Materials, 2008 , 23(5) : 917 -922 . DOI: 10.3724/SP.J.1077.2008.00917

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