预烧过程对LiNi_(0.8)Co_(0.1)Mn_(0.1)O_2组织结构和电化学性能的影响

Influence of pre-sintering process on the structure and electrochemical performance of LiNi_(0.8)Co_(0.1)Mn_(0.1)O_2

采用固相法合成了锂镍钴锰氧化物(LiNi_(0.8)Co_(0.1)Mn_(0.1)O_2)正极材料,探究了不同预烧温度对材料结构及电化学性能的影响。通过X射线衍射(XRD)、扫面电镜(SEM)和电化学测试对合成样品进行表征分析。结果表明,当预烧温度为300~700℃时,合成的正极材料均无杂相;预烧温度为400℃时,合成的正极材料具有良好的电化学性能,在0.2C倍率下首次放电比容量为197.4mAh/g,经过30次循环后容量保持率为92.9%。

LiNi0.8Co0.1Mn0.1O2anode materials were synthesized by solid-state method,the effect of different pre-sintering temperature on the structure and electrochemical properties of samples were studied.Physical and electrochemical characterizations were made on the as-prepared LiNi0.8Co0.1Mn0.1O2 by X-ray diffraction,scanning electron microscope and charge-discharge test.The results showed that it had no impurities phases in LiNi0.8Co0.1Mn0.1O2 synthesized at pre-sintering temperature range from 300to 700℃.LiNi0.8Co0.1Mn0.1O2 anode materials exhibited excellent electrochemical performance when it was synthesized at 400℃.The initial discharge capacity was 197.4mAh·g^-1,and capacity retention of 92.9%in 30cycles at 0.2C.