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化学学报
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化学学报 ›› 2007, Vol. 65 ›› Issue (2): 165-169. 上一篇    下一篇

研究论文

锂离子电池薄膜锡负极材料的制备及容量衰减机理研究

樊小勇1, 庄全超1, 许金梅1, 江宏宏1, 黄令1, 董全峰1,2, 孙世刚*,1   

  1. (1固体表面物理化学国家重点实验室 厦门大学化学化工学院化学系 厦门 361005)
    (2厦门大学宝龙电池研究所 厦门 361005)
  • 投稿日期:2005-12-28 修回日期:2006-04-20 发布日期:2007-01-28
  • 通讯作者: 孙世刚

Preparation and Capacity Fading Mechanism of Tin Thin Film as Anode of Lithium-ion Battery

FAN Xiao-Yong1; ZHUANG Quan-Chao1; XU Jin-Mei1; JIANG Hong-Hong1; HUANG Ling1; DONG Quan-Feng1,2; SUN Shi-Gang*,1   

  1. (1 State Key Lab for Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005)
    (2 Xiamen University-Powerlong Battery Research Institute, Xiamen 361005)
  • Received:2005-12-28 Revised:2006-04-20 Published:2007-01-28
  • Contact: SUN Shi-Gang

PDF

896

被引次数

34 | 7

以电镀的方法在铜基底上沉积薄膜锡作为锂离子电池负极材料. 运用X射线衍射、扫描电镜、电化学循环伏安、电化学充放电和交流阻抗等多种方法对其结构和性能进行表征和研究. 结果表明所制备的薄膜锡电极主要为四方晶系结构, 其初始放电(嵌锂)容量为709 mAh•g－1, 充电(脱锂)容量为561 mAh•g－1. 电化学循环伏安研究发现在嵌/脱锂过程中薄膜锡经历了多种相变过程. 电化学阻抗谱结果说明, 首次嵌锂过程中当电极电位达到1.2 V在电极表面形成SEI膜, 而当电极电位低于0.4 V表面SEI膜出现破裂, 归因于体积膨胀所致. SEM研究表明30次充放电循环后薄膜锡负极出现龟裂现象.

关键词: 锂离子电池, 负极材料, 薄膜锡, 电镀

Tin thin film coated on Cu substrate as anode of lithium-ion battery was prepared by electroplating. Its structure and properties were characterized and studied by X-ray diffration, scanning electron microscopy, cyclic voltammetry, charging/discharging test and AC impedence method. XRD patterns indicate that the tin thin film exhibits a structure of tetragonal crystal. The first discharge and charge capacities of the tin thin film electrode were determined to be 709 and 561 mAh•g－1, respectively. Cyclic voltammetric results illustrated that multi-phase changes occurred during the lithiation and delithiation. Elec-trochemical impedance spectroscopy (EIS) results indicated that SEI film was begun to form on the surface of tin thin film electrode at 1.2 V, and then break down below 0.4 V because of large volume expansion. SEM investigations revealed that the tin thin film electrode appeared serious cracks after 30 charging and discharging cycles.

Key words: lithium-ion battery, anode material, tin thin film, electroplating