采用共沉淀法合成了锂离子电池正极材料LiCo2xNi0.5-xMn0.5-xO2(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,材料的品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175 mAh·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.
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