物理化学学报 >> 2010, Vol. 26 >> Issue (03): 561-566.doi: 10.3866/PKU.WHXB20100231

电化学 上一篇    下一篇

锂离子电池Sn-Co-Zn 合金负极材料电沉积及其储锂性能

常玉清, 黄令, 孙世刚   

  1. 厦门大学化学化工学院化学系, 固体表面物理化学国家重点实验室, 福建 厦门 361005
  • 收稿日期:2009-07-22 修回日期:2009-10-29 发布日期:2010-03-03
  • 通讯作者: 黄令 E-mail:huangl@xmu.edu.cn

Electrodeposition and Electrochemical Properties of Ternary Sn-Co-Zn Alloy Electrodes as Anodes for Lithium-Ion Batteries

CHANG Yu-Qing, HUANG Ling, SUN Shi-Gang   

  1. State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian Province, P. R. China
  • Received:2009-07-22 Revised:2009-10-29 Published:2010-03-03
  • Contact: HUANG Ling E-mail:huangl@xmu.edu.cn

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摘要：

运用电沉积技术制备出Sn-Co-Zn合金电极材料. 采用X射线衍射(XRD)和扫描电子显微镜(SEM)分析了该合金材料的相结构和表面形貌. 通过循环伏安和电位阶跃实验研究了Sn-Co-Zn合金的电沉积机理, 实验表明, Sn-Co-Zn合金电沉积按扩散控制连续成核和三维生长方式进行. XRD结果表明, 该合金由CoSn3、Co3Sn2和Zn组成. 电化学性能测试表明: Sn-Co-Zn合金电极首次放电(脱锂)容量达751 mAh·g-1, 首次循环的库仑效率为88%; 30周循环之后放电容量为510 mAh·g-1. 该Sn-Co-Zn合金电极良好的电化学储锂性能可能归因于材料的多相结构.

关键词: 锂离子电池, 负极, Sn-Co-Zn合金电极, 电沉积, 电化学成核与生长

Abstract:

A ternary Sn-Co-Zn alloy film was successfully prepared by electrodepositi on copper foil. Electrochemical deposition of the Sn-Co-Zn alloy was studied by cyclic voltammetry (CV) and chronoamperometry (CA). The structure and electrochemical performance of the electroplated Sn-Co-Zn alloy electrodes were also investigated in detail. The CV and CA results revealed that the initial deposition kinetics of the Sn-Co-Zn alloy corresponds to a model that includes a three-dimensional progressive nucleation and diffusion controlled growth. XRD results showed that the electrodeposited Sn-Co-Zn alloy consists of CoSn3, Co3Sn2, and Zn phase. Electrochemical tests indicated that at the first cycle, the discharge capacity (desertion) and columbic efficiency are measured 751 mAh·g-1 and 88%, respectively, at the 30th cycle, the Sn-Co-Zn alloy electrodes still delivered a discharge capacity of 510 mAh·g-1. The good lithium storage performance of the Sn-Co-Zn electrode is ascribed to multi-phase structure of the electrode.

Key words: Lithium-ion battery, Anode, Sn-Co-Zn alloy electrode, Electrodeposition, Electrochemical nucleation and growth