摘要
采用SnCl2.2H2O乙醇溶液浸渍竹炭和NaBH4还原方法制备出一种锂二次电池负极用Sn/C复合材料。考察了复合材料中Sn含量对产物收率、微观结构及电化学性能的影响。结果表明,Sn2+大部分进入到竹炭的孔道中,并被还原为单质Sn;当单质Sn与复合材料质量比为42.5∶100时,复合电极材料具有555.1mAh/g的可逆容量,循环20次后容量保持在423.8 mAh/g,显示出较好的实用性能。
Sn/C anode materials for use in lithium-ion batteries have been prepared by impregnation of bamboo charcoal with an alcoholic solution of SnCl2 ·2H2O followed by reduction with NaBH4. The effect of varying the Sn content on the yield, microstructure and electrochemical properties of the materials was investigated. The results show that most of the Sn2＋ entered the pores of the charcoal and was reduced to metallic tin. When the percentage by mass of Sn in the composite material was 42.5% , its reversible capacity as an Sn/C anode material was about 555.1 mAh/g. After 20 charge/discharge cycles, the charge and discharge capacity remained above 423.8 mAh/g. The composites showed good practical performance as anode materials for lithium-ion batteries.
出处
《北京化工大学学报（自然科学版）》
CAS
CSCD
北大核心
2010年第2期77-82,共6页
Journal of Beijing University of Chemical Technology(Natural Science Edition)
基金
农业部"948"项目(2003-C06/2004-C02)
"十一五"国家科技支撑计划项目(2008BADA9B05)
关键词
竹炭
锡
复合材料
负极材料
锂二次电池
bamboo charcoal
tin
composite materials
anode material
lithium secondary battery
