钴掺杂锰酸锂的合成及其性能研究  

Synthesis of Co doped LiMn_2O_4 cathode material and its performance

作　　者：佟健[1] 胡国荣[2] 

机构地区：[1]TCL金能电池有限公司,广东惠州516005 [2]中南大学冶金科学与工程学院,湖南长沙410083

出　　处：《电池工业》2012年第5期267-271,共5页Chinese Battery Industry

摘　　要：以四氧化三钴(Co3O4)为掺杂原料制备掺杂锂锰氧化合物LiMn2-xCoxO4,并考察了掺杂元素对锂锰氧化物结构、微观形貌和电化学性能的影响。实验结果表明:掺杂未改变产物的尖晶石结构,Co掺杂对颗粒的微观形貌影响也不大,掺杂改性后的正极材料其循环性能有所改善,但是初始放电比容量却有所降低;且LiMn1.96Co0.04O4的高温电化学性能最佳,在55℃条件下进行充放电测试,得到初始放电容量为123.1mAh.g-1,1C充放循环下30次后容量保持率为94.96%以上。Co-doped spinel lithium manganese oxides LiMn2-xCoxO4 are synthesized by solid state reaction method with Co3O4 as doping recourse.Investigations on the structure,micro-morphology and the electrochemical performance shows that Co-doping doesn＇t change the spinel structure,and Co doping have little impact on the morphology of LiMn2O4.The cycle performance of the cathode material is improved by doping,but the initial discharge specific capacity is reduced.LiMn1.96Co0.04O4 shows best high-temperature electrochemical performance.The initial discharge capacity is 123.1 mAh/g,and the capacity retention is more than 94.96% after cycling for 30 times when charging and discharging at 55 ℃.

关 键 词：锰酸锂 高温固相法 掺杂 

分 类 号：TM912.9[电气工程—电力电子与电力传动]