Acta Phys. -Chim. Sin. ›› 2006, Vol. 22 ›› Issue (11): 1409-1412.doi: 10.3866/PKU.WHXB20061120

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Preparation, Characterization and Electrochemical Li-absorption/extraction Behaviors of Nanosized Co-Sn Intermetallic Compounds

XIE Jian;ZHAO Xin-Bing;YU Hong-Ming;QI Hao;CAO Gao-Shao;TU Jiang-Ping   

  1. Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, P. R. China
  • Received:2006-04-10 Revised:2006-06-19 Published:2006-11-06
  • Contact: XIE Jian

Abstract: Three nanosized Co-Sn intermetallic compounds, namely, CoSn2, CoSn, and Co3Sn2, were prepared by solvothermal route and studied as new candidate anode materials for secondary lithium-ion batteries. The as-prepared powders were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and field emission scanning electron microscopy (FESEM). It was found that these three intermetallic compounds showed a high charge-discharge stability. However, they exhibit low electrochemical activity, especially for Co3Sn2, whose first charge capacity is only 93 mAh•g−1, because Li-ions cannot reach the interior of the crystal due to the low Li-ions diffusion rate.

Key words: Lithium-ion batteries, Anode materials, Solvothermal method, Electrochemical performances