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Preparation and electrochemical properties of core-shell Si/SiO nanocomposite as anode material for lithium ion batteries

被引：166
作者：
Zhang, T.
Gao, J.
Zhang, H. P.
Yang, L. C.
Wu, Y. P. [1 ]
Wu, H. Q.
机构：
[1] Fudan Univ, Dept Chem, Shanghai 200433, Peoples R China
[2] Fudan Univ, Shanghai Key Lab Mol Catalysis & Innovat Mat, Shanghai 200433, Peoples R China
来源：
ELECTROCHEMISTRY COMMUNICATIONS | 2007年 / 9卷 / 05期
基金：
中国国家自然科学基金;
关键词：
lithium ion battery; core-shell; Si/SiO nanocomposite; sol-gel; aggregation;
D O I：
10.1016/j.elecom.2006.11.026
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
The Si/SiO nanocomposite was synthesized by a sol-gel method in combination with a following heat-treatment process. It was analyzed by X-ray diffraction (XRD), transmission electron microscopy (TEM), cyclic voltammetry (CV) and capacity measurement as anode material for lithium ion battery. Si nanoparticles were coated with SiO and a core-shell structured nanocomposite was formed. The core-shell Si/SiO nanocomposite displays better reversibility of lithium insertion/extraction and higher coulomb efficiency than virginal Si nanoparticles. The SiO shell envelops the Si nanoparticles to suppress the aggregation of the nanoparticles during cycling. As a result, the core-shell Si/SiO nanocomposite exhibits better capacity retention than virginal Si nanoparticles, indicating that this is a promising approach to improve the electrochemical performance of nano anode materials for lithium ion battery. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码：886 / 890
页数：5
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