电沉积法制备锂离子电池用复合锡基合金负极

ELECTRODEPOSITED TIN-BASED ALLOY WITH COMPOSITE STRUCTURE USED AS ANODE MATERIALS FOR LITHIUM ION BATTERIES

采用倒相法在Cu箔上制得与Cu箔结合牢固的PAN与石墨多孔复合膜。以其作阴极、纯Sn作阳极进行脉冲电沉积,Sn通过多孔复合膜的微孔沉积在铜箔上,然后在氩气气氛中热处理,得到具有复合结构的Sn基合金电极(碳膜隔离的Cu-Sn合金),用作Li离子电池的负极．SEM和EDS能谱分析以及模拟电池的电化学性能测试结果表明:与通常的在裸Cu箔上直接电沉积Sn并热处理的Sn电极相比,这种具有复合结构的Sn电极热处理后具有更好的循环性能和更高的循环容量,首次放电容量达到538．3mA．h/g,50次循环后充电(Li离子的脱出)循环容量保持率仍有85．5%．

The porous composite membrane prepared by a phase inversion process was coated on a copper foil, and then tin was electrodeposited on Cu foil through micropore in the composite membrane. The tin-based composites heat-treated under argon atmosphere are used as anode materials for lithium ion batteries. SEM, EDS and electrochemical of the coin cells showed that the electrodeposited tin electrodes with composite structure have the better cycle performance and larger reversible capacity. The first discharge capacity is 538.3 mA·h/g and the charge capacity retention is 85.5% after 50 cyc.