新型正极材料LiCo_(1/3)Fe_(1/3)Mn_(1/3)O_2的合成及其电化学性能  

Synthesis and electrochemical performance of new cathode material LiCo_(1/3)Fe_(1/3)Mn_(1/3)O_2

作　　者：苗家军[1] 王晓清[2] 易炜[1] 张联齐[1] 

机构地区：[1]中国电子科技集团公司第十八研究所,天津300381 [2]天津工业大学环境与化学工程学院,天津300160

出　　处：《电源技术》2010年第10期1008-1011,共4页Chinese Journal of Power Sources

摘　　要：寻找一种提高或替代LiCo1/3Ni1/3Mn1/3O2三元锂离子电池正极材料一直是大家研发的目标。尝试合成了一种新型锂离子电池正极材料LiCo1/3Fe1/3Mn1/3O2。用适量Li含量合成目标材料时,纯相LiCo1/3Fe1/3Mn1/3O2在1 100℃通过淬火的办法合成,但材料中有较强的阳离子层间混排;低温或不淬火不能获得纯相。增加原材料中Li摩尔含量至Li/(Co+Fe+Mn)=1.33时,不需要淬火就可低温合成层状纯相,而且材料的层状性变强。电化学性能显示用适量Li含量合成的LiCo1/3Fe1/3Mn1/3O2材料作为锂离子电池正极材料有极差的电化学性能,这应该由于严重的阳离子层间混排造成的。用Li过量合成的材料显示了提高的电化学性能,首次充电比容量达到277 mAh/g,但放电比容量达到128mAh/g。The search for an improved LiCo1/3Ni1/3Mn1/3O2 or alternative cathode materials for Li-ion battery is ongoing task.In this work,the synthesis of a new cathode material LiCo1/3Fe1/3Mn1/3O2 was attempted.The pure layered phase with serve cation disorder could be successfully prepared using stoichiometric Li salt by quenching method at a high temperature up to 1 100℃.The lower temperature or furnace cooling resulted in mixtures.The increasing content of Li salt with the molar ratio of Li/（Co＋Fe＋Mn）=1.33 caused easiness of materials synthesis with significant improved layered ordering.The electrochemical results show that the materials prepared using stoichiometric Li salt content are hardly electrochemically active due to serve cation mixing.The materials prepared using excess Li salt content delivers remarkably improved charge-discharge performance with initial charge-discharge capacities of about 277 mAh/g and 128 mAh/g,respectively.

关 键 词：锂离子电池 正极材料 LiCo1/3Fe1/3Mn1/3O2 

分 类 号：TM912.9[电气工程—电力电子与电力传动]