三维多孔Sn-Co合金负极制备及其电化学性能研究  

Preparation and Electrochemical Performance of Three-Dimensional Porous SnCo Alloy Electrode

作　　者：薛连杰[1] 黄令[1] 柯福生[1,2] 魏国祯[1,2] 郑小美[1,2] 李君涛[1,2] 樊小勇[1,2] 孙世刚[1,2] 

机构地区：[1]厦门大学化学化工学院化学系,福建厦门361005 [2]厦门大学固体表面物理化学国家重点实验室,福建厦门361005

出　　处：《电化学》2010年第2期161-167,共7页Journal of Electrochemistry

基　　金：国家自然科学基金项目(20773102;20833005);国家973项目(2009CB220102)资助

摘　　要：采用化学镀方法制备三维多孔铜.以其作为集流体,借助电沉积制备三维多孔Sn-Co合金电极.X-射线衍射(XRD),扫描电镜(SEM)分析表明,以多孔铜为集流体制备的SnCo合金电极主要存在CoSn2相和纯Sn相,为三维多孔结构.充放电结果显示,三维结构SnCo合金电极比平面铜集流体上镀得的SnCo合金电极表现出更优越的充放电性能.前者的首次放电(嵌锂)容量为636.3mAh/g,充电(脱锂)容量为528.7mAh/g,首次库仑效率为83.1%,70周后容量为529.5mAh·g-1,保持率为82.6%.此外,还应用电化学阻抗初步研究了三维Sn-Co合金电极在充放电过程发生的嵌脱锂过程.Three-dimensional porous Cu film was prepared by electroless plating,and used as a current collector for preparation of three-dimensional structured SnCo alloy electrode,which was mainly prepared by an electrodeposition method,and composed of pure Sn and CoSn2 phases. Electrochemical experimental results show that three-dimensional structured SnCo alloy electrode exhibits much better cycleability than planar SnCo alloy electrode,with first discharge capacity and charge capacity of 636. 3 and 528. 7 mAh·g-1,respectively. After 70th cycling,capacity retention is 83. 1% with 529. 5 mAh·g-1. The lithiation process during first discharge was investigated by electrochemical impedance spectroscopy

关 键 词：多孔铜 锂离子电池 Sn-Co合金 负极 电化学阻抗谱 

分 类 号：TM912[电气工程—电力电子与电力传动]