(1. 浙江大学 化学系，杭州 310027；2. 中国科学院 金属研究所 腐蚀与防护国家重点实验室，沈阳 110016)
摘 要: 以铜箔为基体，采用电沉积法制备锡电沉积层，并将其制成锂离子电池用锡电极。采用扫描电子显微镜、X射线能量分散分析、X射线衍射、循环伏安和恒流充放电等对锡电极的物理性质和电化学性能进行表征。结果表明：调整电沉积时间可以有效地改变锡沉积层的表面形貌；电沉积5 min获得的网状多孔结构的锡沉积层具有较大的不可逆容量和较好的电化学循环性能；电沉积较长时间制得的致密颗粒状金属锡电沉积层具有相对较大的可逆储锂容量，但其在电化学循环过程中会出现容量衰退现象；锡颗粒尺寸的降低有利于改进颗粒状金属锡电沉积层的储锂性能；电沉积15 min制得的锡沉积层由粒径较小的颗粒组成，经30次充放电循环后其可逆储锂容量为400 mA∙h/g。
关键字: 锡电极材料；锂离子电池；电沉积；形貌；容量
electrode material for lithium-ion battery
（1. Department of Chemistry, Zhejiang University, Hangzhou 310027, China;
2. State Key Laborat, ory for Corrosion and Protection of Metal, Institute of Metal Research,
Chinese Academy of Sciences, Shenyang 110016, China）
Abstract:The electrodeposited tin coatings as electrode material for lithium-ion batteries were prepared by electroplating using copper foil as substrate, and their properties were investigated by scanning electron microscopy (SEM), X-ray energy dispersive analysis, X-ray diffractometry (XRD), cyclic voltammetry (CV) and galvanostatic charge-discharge tests. The results show that the morphologies of the tin coatings may be effectively changed by adjusting the electroplating time. The Sn coating with porous network structure obtained by electroplating for 5 min shows large irreversible capacity and good electrochemical-cycling stability. The dense granular tin coatings obtained by electroplating for longer time display larger reversible lithium storage capacity, but the capacity decay occurs during the electrochemical cycling. For the dense granular tin coatings, smaller tin grain size improves the lithium storage performance. The dense granular tin coating with smaller grain size obtained by electroplating for 15 min presents reversible capacity of 400 mA∙h/g after 30 cycles.
Key words: Sn electrode material; lithium ion batteries; electroplating; morphology; capacity
