Li_(2)MgSiO_(4)包覆LiCoO_(2)正极材料的高电压性能  

High voltage performance of Li_(2)MgSiO_(4)coated LiCoO_(2)as cathode material

作　　者：申斌 刘万民[1] 秦牡兰[1] 王伟刚 SHEN Bin;LIU Wan-min;QIN Mu-lan;WANG Wei-gang(College of Materials and Chemical Engineering,Hunan Institute of Engineering,Xiangtan,Hunan 411100,China)

机构地区：[1]湖南工程学院材料与化工学院,湖南湘潭411100

出　　处：《电池》2021年第2期178-182,共5页Battery Bimonthly

基　　金：湖南省自然科学基金青年项目(2020JJ5102);湖南省教育厅重点项目(19A111)。

摘　　要：采用溶胶-凝胶法制备快离子导体硅酸镁锂(Li_(2)MgSiO_(4))包覆的钴酸锂(LiCoO_(2))正极材料,利用XRD、SEM和能量散射谱(EDS)等分析样品的晶体结构、形貌和元素组成。Li_(2)MgSiO_(4)包覆未破坏LiCoO_(2)的层状结构,且包覆层分布均匀,使电化学性能得到提升。在2.75~4.55 V充放电,包覆材料的0.10 C比容量为206.3 mAh/g;0.50 C循环50次的容量保持率为82.8%,高于未包覆材料的34.8%;4.00 C放电比容量可达0.10 C时的64%。The lithium cobalt oxide(LiCoO_(2))cathode material coated with fast ion conductor material lithium magnesium silicate(Li_(2)MgSiO_(4))was prepared via sol-gel method.The crystal structure,morphology and element composition of prepared samples were analyzed by XRD,SEM and energy dispersive spectroscopy(EDS).The Li_(2)MgSiO_(4)coating layer didn’t damage the layered structure of LiCoO_(2)and was evenly distributed,so that the electrochemical performance was improved.When charged-discharged in 2.75-4.55 V,the specific capacity of the coated material was 206.3 mAh/g at 0.10 C,the capacity retention rate of 50 cycles at 0.50 C was 82.8%,which was higher than the 34.8%of the uncoated material,when discharged at 4.00 C,it could deliver 64%of the specific capacity at 0.10 C.

关 键 词：锂离子电池 钴酸锂(LiCoO_(2)) 硅酸镁锂(Li_(2)MgSiO_(4)) 高电压 包覆 

分 类 号：TM912.9[电气工程—电力电子与电力传动]