高等学校化学学报

高等学校化学学报 ›› 2011, Vol. 32 ›› Issue (4): 934.

• 研究论文 • 上一篇    下一篇

电化学阻抗谱法研究温度对三维多孔Cu6Sn5合金电极嵌锂过程的影响

樊小勇1,2, 王晶晶1, 李严1, 曹桂铭1, 史晓媛1, 黄令2, 孙世刚2, 李东林1   

  1. 1. 长安大学材料科学与工程学院,  西安 710061;
    2. 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,   厦门 361005
  • 收稿日期:2010-07-02 修回日期:2010-10-08 出版日期:2011-04-10 发布日期:2011-03-09
  • 通讯作者: 樊小勇,孙世刚 E-mail:xyfan@chd.edu.cn;sgsun@xmu. edu. cn
  • 基金资助:

    国家自然基金青年科学基金(批准号:  20903016)、长安大学“中央高校基本科研业务费专项资金”项目(批准号: CHD2009JC034)、高等学校科技创新工程重大项目培育资金项目(批准号:   708084)和国家“九七三”计划项目(批准号:   2009CB220102)资助.

Electrochemical Impedance Spectroscopy Study on Effects of Temperature on the Lithiation Process of 3-Dimensional  Porous Cu6Sn5 Alloy Electrode

FAN Xiao-Yong1,2*, WANG Jing-Jing1, LI Yan1, CAO Gui-Ming1, SHI Xiao-Yuan1, HUANG Ling2, SUN Shi-Gang2*, LI Dong-Lin1   

  1. 1. School of Materials Science and Engineering, Chang′an University, Xi′an 710061, China;
    2. State Key Lab of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
  • Received:2010-07-02 Revised:2010-10-08 Online:2011-04-10 Published:2011-03-09
  • Contact: FAN Xiao-Yong,SUN Shi-Gang E-mail:xyfan@chd.edu.cn;sgsun@xmu. edu. cn
  • Supported by:

    国家自然基金青年科学基金(批准号:  20903016)、长安大学“中央高校基本科研业务费专项资金”项目(批准号: CHD2009JC034)、高等学校科技创新工程重大项目培育资金项目(批准号:   708084)和国家“九七三”计划项目(批准号:   2009CB220102)资助.

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被引次数

5

摘要： 采用氢气泡为动力学模板电沉积获得多孔铜，并通过热处理增强其结构稳定性，并以该多孔铜为基底电沉积获得三维多孔Cu6Sn5 合金电极。采用循环伏安法研究了三维多孔Cu6Sn5 合金电极的嵌/脱锂电位。采用电化学阻抗谱研究了三维多孔Cu6Sn5 合金电极在不同温度下的首次嵌锂过程。结果显示，在主要的嵌锂区间内，三维多孔Cu6Sn5 合金电极的Nyquist图分别由3部分组成，即代表锂离子穿过电极表面SEI膜的阻抗的高频圆弧、代表电荷传递阻抗的中频圆弧和代表相变阻抗的低频圆弧。选择合适的等效电路对阻抗谱进行模拟，并分析了其随温度的变化规律。

关键词: 锂离子电池, 负极, 三维多孔, Cu6Sn5合金电极, 电化学阻抗谱

Abstract: Porous Cu was fabricated by electrodepositing using hydrogen bubbles as the dynamic template, and subsequently treated by annealing to increase the structural stability. The 3-dimentional porousCu6Sn5 alloy electrode was prepared by electrodepositing using the porous Cu as the substrate. The lithiation/delithiation potentials of 3-dimentional porousCu6Sn5 were investigated by cyclic voltammetry. The initial lithiation process of 3-dimentional porous Cu6Sn5 alloy electrode at different temperature was studied by electrochemical impedance spectroscopy. The results indicate that the Nyquist plots are composed of three regions in the main lithiation range: high frequency arc representing solid electrolyte interphase (SEI) impedance, middle frequency arc representing charge transfer impedance, and low frequency arc representing phase transformation impedance. The change principles of the electrochemical impedance versus temperature were analyzed by simulating the experimental data using appropriate equivalent circuit.

Key words: Lithium-ion battery, Anode, 3-dimensional porous, Cu6Sn5 alloy electrode, Electrochemical impedance spectroscopy

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