Cr掺杂对Li_(1.2)Ni_(0.2)Mn_(0.6)O_2结构和电化学性能的影响  

Effects of Cr Doping on the Structure and Electrochemical Performance of Li_(1.2)Ni_(0.2)Mn_(0.6)O_2

作　　者：郅晓科[1] 叶学海[1] 赵桢[1] 何爱珍[1] 王旭阳[1] 章甦[1] 时洁[1] 

机构地区：[1]中海油天津化工研究设计院,天津300131

出　　处：《广州化工》2013年第6期75-77,共3页GuangZhou Chemical Industry

摘　　要：采用共沉淀法制备了锂离子电池正极材料Li_(1.2)Mn_(0.6)Ni_(0.2)O_2和Li_(1.2)Ni_(0.18)Mn_(0.58)Cr_(0.04)O_2,并利用X射线衍射(XRD)、扫描电镜(SEM)和电化学性能测试对材料的晶体结构、形貌和电化学性能进行了表征。结果表明:掺Cr^(3+)后材料的阳离子混排程度降低,层状结构更为规整,电化学性能明显优于Li_(1.2)Mn_(0.6)Ni_(0.2)O_2,其0.2C和1C首次放电容量分别为262.2 mAh/g和241.7 mAh/g,1C倍率下循环50次的容量保持率为95.5%。Lithium - ion battery cathode materials Li1. 2 Mn0. 6 Ni0. 202 and Li1. 2 Ni0. 18 Mn0. 58 Cr0. 04O2 were synthesized by co -precipitation reaction. Their crystal structure, morphology and electrochemical properties were characterized by X - ray diffraction （XRD）, scanning electron microscopy （SEM） and electrochemical performance tests. The results showed that the Cr - doped materials had a lower cation mixing degree and more ordered layered structure, and its electrochemical performance was superior to that of Li1.2Mn0.6Ni0.2O2. The initial discharge capacity of Cr - doped materials at 0. 2 C and 1 C were 262.2 and 241.7 mAh/g, respectively, and the capacity retention rate was 95.5% after cycled 50 times at 1 C rates.

关 键 词：锂离子电池 正极材料 掺杂 LI1 2Mn0 6Ni0 2O2 

分 类 号：TQ152[化学工程—电化学工业]