Co、Mn包覆镍基材料LiNi_(0.90)Co_(0.05)Mn_(0.05)O_2的烧结温度与性能研究  

Study on sintered temperature and performance of nickel base cathode LiNi_(0.90)Co_(0.05)Mn_(0.05)O_2 coated with Co and Mn components

作　　者：梅佳 张骞[2] 钟盛文[2] 张淑静[2] 初旭光 李月涛 刘庆国[3] 

机构地区：[1]石家庄百思特电池材料有限公司,河北石家庄050021 [2]江西理工大学材料与化学工程学院,江西赣州341000 [3]北京科技大学固体电解质研究室,北京100083

出　　处：《电源技术》2007年第5期376-381,共6页Chinese Journal of Power Sources

基　　金：江西省重大科技专项基金(无基金号)

摘　　要：采用化学共沉淀法,即将Co、Mn氢氧化物包覆球形Ni(OH)2合成了正极材料LiNi0.90Co0.05Mn0.05O2的前驱体,利用该前驱体和氢氧化锂球磨混匀后,高温焙烧,合成了Co、Mn包覆镍基三元正极材料LiNi0.90Co0.05Mn0.05O2,分析了烧结温度对结构、形貌、性能的影响。研究表明:720℃烧结的LiNi0.90Co0.05Mn0.05O2性能最佳,在25℃,2.75￣4.2V,1C充放电条件下,具有160￣180mAh/g的比容量;循环300次,其容量保持率为100.7%。The precursor of LiNi0.90Co0.05Mn0.05O2was prepared by co-precipitation method, in which the spherical Ni （OH）2 grains coated with Co-Mn hydroxide. The precursor was mixed uniformly with LiOH.H2O and the mixture was sintered at high temperature. Then the nickel based cathode materials LiNi0.90Co0.05Mn0.05O2 coated with Co and Mn hydroxide was synthesized. The temperatures of reaction were studied, and it had an influence on structure, surface appearance and electrochemical properties of LiNi0.90Co0.05Mn0.05O2 Research results show that the LiNi0.90Co0.05Mn0.05O2 sintered at 720 ℃has excellent electrochemical performance; it has discharge capacity range of 160-180 mAh/g under the conditions of 25℃, 2.75-4.2 V and 1 C rate; it has excellent capacity retention in cycle, such as about 100.7% after 300 cycles.

关 键 词：锂离子电池 正极材料 包覆 LiNi0.90Co0.05Mn0.05O2 烧结温度 性能 

分 类 号：TM912.2[电气工程—电力电子与电力传动]