低钴正极材料LiNi_XCo_YMn_(1-X-Y)O_2的合成及性质研究  

Preparation and electrochemical performance of LiNi_XCo_YMn_(1-X-Y)O_2 with lower content of cobalt

作　　者：张卓[1] 刘晋[2] 王光彦[2] 廖莉玲[2] 

机构地区：[1]贵州省公安厅物证鉴定中心,贵州贵阳550001 [2]贵州师范大学化学与材料科学学院,贵州贵阳550001

出　　处：《电源技术》2015年第11期2365-2367,共3页Chinese Journal of Power Sources

基　　金：贵州省科技厅与贵州师范大学联合基金(黔科合J字LKS[2009]38号)

摘　　要：采用溶胶-凝胶法制备低钴三元正极材料Li NiXCoYMn1-X-YO2(X=0.2,0.3,0.4,0.5,0.6;Y=0.1,0.2),通过X射线衍射(XRD)、扫描电镜(SEM)和电化学性能测试对样品的结构和性能进行了表征。结果表明,Li Ni0.4Co0.2Mn0.4O2层状结构良好,颗粒粒径较小且分布均匀,该样品具有最好的电化学性能,首次放电比容量可达146.2 m Ah/g,循环20次后放电比容量可达111.7 m Ah/g。The samples with lower content of cobalt LiNiXCoYMn（1-X-Y）O2 （X=0.2, 0.3, 0.4, 0.5, 0.6; Y=0.1,0.2） were synthesized by sol-gel method and characterized by XRD, SEM and electrochemical performance testing in the voltage range of 2.5-4.3 V. The results show that the sample Li Ni0.4Co0.2Mn0.4O2 has a prefect layered structure, smaller particle size, uniformly distribution and the best electrochemical performance compared to other samples. The first discharge capacity is up to 146.2 mAh/g and 111.7 mAh/g after 20 cycles.

关 键 词：低钴 正极材料 LiNiXCoYMn1-X-YO2 电化学性能 

分 类 号：TM912.9[电气工程—电力电子与电力传动]