摘要
采用共沉淀法合成了锂离子电池正极材料LiCo_(2x)Ni_(0.5-x)Mn_(0.5-x)O_2(2x=0.1,0.2,0.33和0.5)。对产物进行了XRD,SEM、充放电和DSC测试,以考察不同Co含量2x对材料的结构、电化学性能和热稳定性能的影响。结果表明,随着材料中Co含量2x的提高,材料的晶格参数和晶胞体积逐渐减小,材料的循环性能和倍率放电能力得到改善。特别当2x=0.33时,材料具有较好的电化学性能:首次放电容量为175mAh.g-1,30次循环后容量保持率为89.1%。同时其具有最好的热稳定性能。
LiCo2xNi0.5-xMn0.5-xO2（2x = 0.10, 0.20, 0.33 and 0.50） cathode materials for lithium ion battery were synthesized by coprecipitation. The effects of Co content （2x） on the structure, electrochemical performance and the thermal stability of the materials were studied by XRD, SEM, charge-discharge and DSC tests. It was found that with the Co content （2x） increasing, the lattice parameters and the unit cell volume decreased and the cycle performance and the rate capability were improved. When 2x = 0.33 the synthesized material showed the best thermal stability and better electrochemical performance that the initial discharge capacity was 175 mAh · g^-1 and the capacity retention after 30 cycles was 89.1%.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2009年第3期371-375,共5页
Chinese Journal of Rare Metals
关键词
锂离子电池
正极材料
共沉淀
电化学性能
热稳定性
lithium ion battery
cathode materials
coprecipitation
electrochemical performance
thermal stability
