Pb-Sn复合粉作为锂离子电池负极材料的研究  

Research on the Pb-Sn Composites as Anode Materials for the Lithium Ion Batteries

作　　者：吕成学[1] 杨瑞芹[2] 刘铁兵[2] 

机构地区：[1]浙江科技学院科技处,杭州310023 [2]浙江科技学院生物与化学工程学院,杭州310023

出　　处：《材料导报》2010年第22期58-61,共4页Materials Reports

基　　金：国家重点基础研究发展规划资助项目(G199904690-1);沈阳市科技基金资助项目(102241-1-06);浙江科技学院人才引进科研启动基金项目(F501309901)

摘　　要：采用共沉淀法制备了锡基复合氧化物SnPbO2,再用氢还原法将该复合氧化物还原,得到Pb-Sn金属复合粉。XRD测试分析发现,400℃时无定型的SnPbO2完全转化成Pb-Sn金属复合粉。通过SEM对Pb-Sn复合粉进行形貌观察发现,Pb-Sn颗粒的平均粒径约为200nm。利用恒电流电池自动测试仪测试了Pb-Sn复合粉的电化学性能,结果表明,其首次嵌锂容量为370mAh/g,首次脱锂容量为330mAh/g;第20周的嵌锂容量为280mAh/g,脱锂容量为270mAh/g。充放电反应机理可能为锂与Pb-Sn中活性基物质(Sn)的合金化/去合金化反应。Pb-Sn composites have been prepared by H2-reduction, after preparing Sn-based composites oxide SnPbO2 by coprecipitation. The morphology, microstructure and electrochemical performance of Pb-Sn composites are investigated by X-ray diffraction（XRD）, scanning electron microscopy（SEM）, and galvanostatic cycling tests. The re- sults show that the amorphous SnPbO2 completely translate to Pb-Sn composite powders at 400℃, which particles are spherical, with average particle diameter of 200nM Electrochemical performance tests of model cells show that the li- thiation capacity and delithiation capacity reach 370mAh/g and 330mAh/g in the first cycle. The retention capacities of lithium insertion and extraction are 280mAh/g and 270mAh/g after 20th cycle. The reaction mechanism of the charge and discharge belongs to alloying and de-alloying process of lithium with stannum.

关 键 词：锂离子电池 负极材料 充放电容量 循环寿命 

分 类 号：TM912.9[电气工程—电力电子与电力传动]