氧化物熔融浸渍法包覆LiNi_(0.4)Co_(0.2)Mn_(0.4)O_2的电化学性能研究  

Research on Electrochemical Properties of Metal Oxides Coated LiNi_(0.4)Co_(0.2)Mn_(0.4)O_2 by Melting Impregnation

作　　者：张进[1] 曹高劭[1] 涂江平[1] 赵新兵[1] 

机构地区：[1]浙江大学材料系,杭州310027

出　　处：《材料导报（纳米与新材料专辑）》2008年第1期258-260,263,共4页

基　　金：浙江省科技计划项目(2007C21100)

摘　　要：以提高锂离子电池正极材料LiNi_(0.4)Co_(0.2)MnO_2的循环性能为目的,采用熔融浸渍法制备了Al_2O_3和ZnO表面包覆的LiNi_(0.4)Co_(0.2)Mn_(0.4)O_2正极材料。微观组织结构分析结果表明,包覆后LiNi_(0.4)Co_(0.2)Mn_(0.4)O_2颗粒表面形成了一层厚度不均匀的纳米氧化物。电化学测试表明,ZnO和Al_2O_3包覆提高了材料的循环稳定性,在1C恒流充放电循环50次后容量保持率由包覆前的79.7%分别提高到88.4%和100%。Melting impregnation method is used to coat LiNi0.4Co0.2Mn0.4O2 cathode materials with metal oxides Al2O3 and ZnO in order to improve its cyclic properties. Microstructure analyses show that the LiNi0.4Co0.2Mn0.4O2particles are covered by a layer of asymmetric nano-oxides. Electrochemical measurements indicate that the cycle stability of LiNi0.4Co0.2Mn0.4O2 cathode can be improved significantly. The capacity retention after 50 cycles at 1C rate increases from 79. 7% for the as-received material to 88. 4% and 100%, respectively for the ZnO and Al2O3 coated samples.

关 键 词：LiNi0.4Co0.2Mn0.4O2 锂离子电池 正极材料 熔融浸渍法 氧化物包覆 

分 类 号：TM912.9[电气工程—电力电子与电力传动]