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电化学  2014 

ZnO包覆LiNi1/3Co1/3Mn1/3O2的表面结构和电化学性能

DOI: 10.13208/j.electrochem.121024, PP. 60-65

Keywords: LiNi1/3Co1/3Mn1/3O2,包覆,表面,锂离子电池

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Abstract:

在LiNi1/3Co1/3Mn1/3O2正极材料表面包覆ZnO,通过X射线衍射(XRD)和光电子能谱(XPS)分析包覆层对正极材料表面状态的改变,并考察了改性后材料的放电容量、首次不可逆容量等电化学性能变化.结果表明:ZnO主要存在于材料表面并影响着材料表面组成和电化学性质,材料表面镍和锰的含量随着包覆量的增加而增大;400oC热处理可使过渡金属与锌在材料表面形成复合氧化物,过渡金属的结合能增大;包覆2%(bymass,下同)的ZnO可有效抑制55oC下充放电时3.6V附近的不可逆反应,提高了材料的首次库仑效率;包覆2%ZnO的电池材料在55oC/0.5C的放电比容量和循环寿命最佳.

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