物理化学学报 >> 2006, Vol. 22 >> Issue (12): 1537-1541.doi: 10.3866/PKU.WHXB20061220

研究论文 上一篇    下一篇

新型三维网状锡-钴合金负极材料的结构与性能

黄令;江宏宏;柯福生;樊小勇;庄全超;杨防祖;孙世刚   

  1. (厦门大学化学化工学院化学系, 福建 厦门 361005)
  • 收稿日期:2006-06-19 修回日期:2006-08-28 发布日期:2006-12-06
  • 通讯作者: 黄令 E-mail:huangl@xmu.edu.cn

Structure and Properties of Three-dimensional Reticular Sn-Co Alloy Electrodes as Anode Material for Lithium Batteries

HUANG Ling;JIANG Hong-Hong;KE Fu-Sheng;FAN Xiao-Yong;ZHUANG Quan-Chao;YANG Fang-Zu;SUN Shi-Gang   

  1. (Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, P. R. China)
  • Received:2006-06-19 Revised:2006-08-28 Published:2006-12-06
  • Contact: HUANG Ling E-mail:huangl@xmu.edu.cn

摘要: 应用电沉积技术制备了三维网状结构的Sn-Co合金负极材料, 采用XRD、SEM和电化学方法考察了该负极材料的结构和性能. XRD分析表明, 该三维网状结构的Sn-Co合金镀层为六方固溶体结构. 其电化学性能测试表明: 三维网状结构Sn-Co合金微晶电极的性能稳定, 其首次放电容量高达493.4 mAh•g−1, 首次库仑效率达80.03%, 而平面结构Sn-Co合金电极的首次库仑效率为63.47%. 经50周充放电循环后, 三维网状结构Sn-Co合金电极的放电容量为329.6 mAh•g−1, 放电容量保持率为66.8%;SEM分析表明: 三维网状Sn-Co合金电极表面是由大小不一、高低不同的“岛”紧密排列在一起;“岛”和多孔结构的存在, 缓冲了锂嵌入时体积的膨胀, 部分抑制了材料结构的变化, 减缓了电极容量的衰减, 改善了电极的循环性能.

关键词: 电沉积, 三维网状Sn-Co合金, 锂离子电池, 电化学性能

Abstract: The three-dimensional reticular Sn-Co alloy deposits were prepared by electroplating. The structure and electrochemical performance of the electroplated three-dimensional reticular Sn-Co alloys have been investigated in detail. Experimental results show that the Sn-Co alloy film is of hexagonal solid solution, with Sn as the solvent, Co as the solute. Electrochemical tests show that the three-dimensional reticular Sn-Co alloy coating electrodes can deliver a discharge capacity of 493.4 mAh•g−1 in the first cycle. At the 50th cycle the charge was 329.6 mAh•g−1. The three-dimensional reticular structure in Sn-Co alloy electrode was beneficial in reducing the irreversible capacity of Sn-Co alloy electrode at initial charge-discharge, and in relaxing the volume expansion during cycling, which improved the cyclability of Sn-Co alloy electrode. They are also beneficial to diffusion of Li into /out of macroporous materials, and improve coulomb efficiency in charge-discharge cycle.

Key words: Electroplating, Three-dimensional reticular Sn-Co alloy, Lithium ion battery, Electrochemical performance