LiMn_2O_4在充放电过程中的相变  

Phase changes of LiMn_2O_4 during electrochemical cycling

作　　者：吕正中[1] 周震涛[1] 

机构地区：[1]华南理工大学材料学院,广东广州510640

出　　处：《电池》2003年第2期77-79,共3页Battery Bimonthly

基　　金：广东省自然科学基金重点项目(963038)

摘　　要：通过X射线衍射图谱,研究了以LiMn2O4为正极活性物质所组成的锂离子电池室温下在4 5～3 5V之间多次充放电循环后LiMn2O4电极的变化。放电后尖晶石LiMn2O4微粒表面生成的Li2Mn2O4发生歧化反应,是电池容量损失的原因之一,结合Li Mn O相图详细地分析了锂锰氧化物电极在充放电过程中的化学变化。Phase changes of LiMn2O4 cathode active materials were investigated in 4?V Liion batteries by Xray diffraction during continuously electrochemical cycling between45?V and35?V at room temperature The capacity fade observed during cycling was attributed, at least partly, to disproportion reactions of Li2Mn2O4 at the particle surface of discharged LiMn2O4 electrodes The chemical reactions during chargedischarge cycling at the LiMn2O4 cathodes were described with respect to the LiMnO phase diagram

关 键 词：锂离子电池 充电过程 放电过程 LIMN204 正极材料 相变 

分 类 号：TM912.9[电气工程—电力电子与电力传动]