摘要
以柠檬酸钠为络合剂、NaBH4为还原剂,将Co(Ⅱ)和Sb(Ⅲ)盐在水溶液中共还原后再经过190℃热处理制得CoSb合金。X射线衍射和扫描电镜的测试结果表明:所得合金六方晶系,颗粒大小在100～200nm之间。对比考察了该合金在0～1.5V之间分别以0.2mA/cm2和0.4mA/cm2的电流密度恒流充放电的电化学性能。测试结果表明,该合金在0.2mA/cm2进行恒流充放电具有良好的电化学性能,20次循环后的稳定比容量为268mAh/g。
CoSb alloy were prepared by reducing a aqueous solution containing Co（Ⅱ） and Sb（Ⅲ） salts with NaBH4 in the presence of sodium citrate as a complexant, then heat treatment at 190 ℃. The results of scanning electron microscope （SEM） and X-ray diffraction （XRD） show that CoSb alloy is a hexagonal structure with particle size of 100-200 nm. Electro chemical performance of anode materials for lithium-ion batteries charge-discharge between 0-1.5 V at different current densities of 0.2 mA/cm^2 and 0.4 mA/cm^2 were tested. The results show that CoSb alloy has a better electrochemical performance at 0.2 mA/cm^2,and the stable specific capacity is 268 mAh/g after 20 cycles.
出处
《电源技术》
CAS
CSCD
北大核心
2007年第7期515-518,共4页
Chinese Journal of Power Sources
基金
国家自然科学基金资助项目(50542004)
