Mg^2+掺杂对Li1.2Mn0.6Ni0.2O2正极材料性能的影响  

Influence of Mg^2+ doping on properties of Li1.2Mn0.6Ni0.2O2 cathode materials

作　　者：陈德鑫 李智敏 李高锋 张茂林 张东岩 闫养希 CHEN De-xin;LI Zhi-min;LI Gao-feng;ZHANG Mao-lin;ZHANG Dong-yan;YAN Yang-xi(School of Advanced Materials and Nanotechnology,Xidian University,Xi’an 710071,China)

机构地区：[1]西安电子科技大学先进材料与纳米科技学院,西安710071

出　　处：《材料工程》2020年第10期157-162,共6页Journal of Materials Engineering

基　　金：国家自然科学基金(51602240,61701369,51701147);陕西省自然科学基础研究计划(2018JM5060,2018JM6070,2017JQ5112)。

摘　　要：采用燃烧合成法,制备Mg^2+掺杂的锂离子电池正极材料Li1.2Mn0.6Ni0.2O2。通过X射线衍射仪、拉曼光谱、扫描电子显微镜对所制备样品分别进行物相结构和形貌表征,并测试其电化学性能。结果表明:所制备样品具有良好的六方层状结构,粉体呈类球形形貌。通过Mg^2+掺杂,能够有效提高Li1.2Mn0.6Ni0.2O2材料的首次库仑效率、循环稳定性和高倍率容量。当Mg^2+掺杂量为0.02时,电池样品表现出良好的电化学性能。Lithium-ion battery cathode materials of Mg doped Li1.2Mn0.6Ni0.2O2 were prepared by combustion synthesis.The phase structures and morphologies of the as-prepared samples were characterized by X-ray diffractometer,Raman spectroscopy and scanning electron microscope,respectively,and their electrochemical performance was measured.Results show that the as-prepared samples have better hexagonal layered structure,with spherical-like appearance.Through Mg^2+ doping,the initial coulombic efficiency,cyclic stability and rate capacity are efficiently enhanced for the Li1.2Mn0.6Ni0.2O2 material.When the Mg^2+ content is 0.02,the battery sample exhibits excellent electrochemical performance.

关 键 词：锂离子电池 富锂正极材料 燃烧合成 掺杂 电化学性能 

分 类 号：TB34[一般工业技术—材料科学与工程]