新型水热改性方法抑制LiMn_2O_4正极材料Jahn-Teller效应  

Novel hydrothermal process on suppressing Jahn-Teller distortion of spinel LiMn_2O_4 cathode

作　　者：王月磊[1,2,3] 张静 吴建宝[1] 刘微 宓一鸣[1] 

机构地区：[1]上海工程技术大学化学化工学院,上海201620 [2]上海市纳米科技与产业发展促进中心,上海200237 [3]中国科学院上海微系统与信息技术研究所,上海200050

出　　处：《电源技术》2015年第1期37-39,共3页Chinese Journal of Power Sources

基　　金：上海工程技术大学研究生科研创新专项(13KY0401);上海市教委物理学科建设项目(E10507140213)

摘　　要：Jahn-Teller效应是LiMn2O4正极材料容量快速下降的重要原因之一,严重制约着其更广泛的商业应用。通过一种新的动态水热方法改性尖晶石LiMn2O4的表面,从而抑制其Jahn-Teller效应,提高电化学性能。通过对各种性能测试的分析,结果表明在LiMn2O4材料表面生成了LiNixMn-xO4固熔体,从而达到了抑制Jahn-Teller效应和提高循环性能的目的。Jahn-Teller distortion was one of the most important reasons of capacity fade for spinel LiMn2O4 as cathode material, and its commercialization in lithium ion batteries was limited. The modified spinel LiMn2O4 via a novel dynamic hydrothermal process was prepared to suppress this distortion. Various instruments were used to investigate the structure and morphology of LiMn2O4. The results reveal that the shell of LiNixMn_n-xO4 solid solution is formed on the surface of LiMn2O4 particles, and the purpose of suppressing the Jahn-Teller distortion and further improving its cyclic performance are realized.

关 键 词：LIMN2O4 动态水热法 表面改性 JAHN-TELLER效应 锂离子电池 

分 类 号：TM912.9[电气工程—电力电子与电力传动]