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化学学报
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化学学报 ›› 2009, Vol. 67 ›› Issue (16): 1865-1868. 上一篇    下一篇

研究论文

锂离子电池用SnZn/Cu薄膜负极材料的研究

王连邦* 康虎强 徐土根 黄立军 马淳安

  

  1. (浙江工业大学化学工程与材料学院 绿色化学合成技术国家重点实验室培育基地 杭州 310014)

  • 投稿日期:2008-09-13 修回日期:2009-02-17 发布日期:2009-08-28
  • 通讯作者: 王连邦

SnZn/Cu Film Anode for Lithium-ion Batteries

Wang, Lianbang* Kang, Huqiang Xu, Tugen Huang, Lijun Ma, Chunan

  

  1. (College of Chemical Engineering and Materials Science, Zhejiang University of Technology, Hangzhou 310014)
  • Received:2008-09-13 Revised:2009-02-17 Published:2009-08-28
  • Contact: Wang Lianbang

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1421

被引次数

16

合金型锂离子电池负极材料由于容量高、安全性好而备受关注. 采用磁控溅射法在铜箔上渡膜制备锡锌薄膜, 经热处理后得到合金薄膜电极. 薄膜热处理后, 表面活性层形成Cu3Sn中间合金. 合金薄膜是由尺寸在5 μm左右的合金颗粒构成, 而合金颗粒则由更小的尺寸在50 nm左右微粒组成, 该合金薄膜同时具有薄膜、中间合金和纳米结构材料的特征. 合金薄膜电极具有较高的充放电容量、良好的循环性能和非常高的充放电效率. 在0.01～1.0 V (vs. Li/Li＋)区间, 电极循环200周后放电容量保持在300 mAh•g－1以上, 与第一次脱锂容量相比较, 容量保持率高达91.9%, 充放电效率大于98.0%.

关键词: 锂离子电池, 负极材料, 磁控溅射, 锡, 薄膜

Alloy negative materials for Li-ion batteries have been focused on because of high specific capacity and safety, which would be a promising material for next generation Li-ion batteries. In this work, alloy film anode has been prepared by depositing SnZn on Cu foil with a magnetron sputtering method, followed by heat-treatment. A Cu3Sn intermetallic composite was formed after the heat-treatment. The SEM result showed that the alloy film was composed of alloy particles with the size of around 5 μm, and the alloy particle was composed of smaller particles with size of around 50 nm. The alloy film anode showed high charge-discharge capacity and columbic efficiency, and good cyclic stability. At potential of 0.01～1.0 V (vs. Li/Li＋), the discharge capacity remained over 300 mAh•g－1 after 200 cycles, and the columbic efficiency was over 98.0%. These results should be attributed to the unique structure of the alloy film anode composed of intermetallic composite, thin film and nano-sized active material.

Key words: Li-ion battery, negative material, magnetron sputtering, tin, film