物理化学学报 >> 2006, Vol. 22 >> Issue (11): 1409-1412.doi: 10.3866/PKU.WHXB20061120

研究简报 上一篇    下一篇

纳米Co-Sn金属间化合物的合成、表征及电化学吸放锂行为

谢健;赵新兵;余红明;齐好;曹高劭;涂江平   

  1. 浙江大学材料科学与工程系, 杭州 310027
  • 收稿日期:2006-04-10 修回日期:2006-06-19 发布日期:2006-11-06
  • 通讯作者: 谢健 E-mail:xiejian1977@zju.edu.cn

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 E-mail:xiejian1977@zju.edu.cn

摘要: 用溶剂热法合成了三种纳米尺寸的Co-Sn金属间化合物, 即CoSn2、CoSn和Co3Sn2, 并研究了它们作为锂离子二次电池新型负极材料的电化学性能. 合成的粉末经过了X射线衍射(XRD), 透射电镜(TEM)和场发射扫描电镜(FESEM)的表征. 研究发现, 这三种金属间化合物均显示出较高的充放电稳定性. 由于低的锂离子扩散速率, 在嵌锂过程中锂离子不能深入到晶粒内部, 导致它们的电化学活性较低, 尤其是Co3Sn2, 其首次充电容量仅为 93 mAh•g−1.

关键词: 锂离子电池, 负极材料, 溶剂热法, 电化学性能

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