热处理制度对机械化学法合成LiMn_2O_4的影响  

Effects of thermal treatment system on LiMn_2O_4 synthesized by mechano-chemistry method

作　　者：洪良仕[1] 李运姣[1] 习小明[2] 

机构地区：[1]中南大学冶金科学与工程学院,湖南长沙410083 [2]长沙矿冶研究院,湖南长沙410012

出　　处：《电池》2005年第6期450-452,共3页Battery Bimonthly

基　　金：国家自然科学基金资助(50174058)

摘　　要：以Li2CO3和Mn3O4为原料,采用机械化学法合成了尖晶石LiMn2O4。考察了热处理温度和时间对LiMn2O4电化学性能的影响。720℃下热处理2 h、6 h和10 h所得样品的首次放电比容量分别为124.5 mAh/g、124.6 mAh/g和126.3 mAh/g。在400℃、600℃、720℃和800℃下热处理6 h后得到的样品的首次放电比容量分别为120.6 mAh/g、124.4 mAh/g、124.6 mAh/g和128.6 mAh/g,经过10次循环后,比容量下降的幅度分别为13.8%、11.5%、9.5%和6.5%。适宜的热处理制度为:800℃热处理6 h。Spinel LiMn2O4 was synthesized by mechano-chemistry method with Li2CO3 and Mn3O4 as raw materials. The effects of thermal treatment temperature and time on the electrochemical performance of LiMn2O4 were studied. After heat treatment at 720℃ for 2 h, 6 h and 10 h, the initial discharge specific capacity of samples were 124.5 mAh/g, 124.6 mAh/g and 126.3 mAh/g,respectively. The initial discharge specific capacity of samples obtained under the condition of heat treated at 400℃, 600℃, 720℃ and 800℃ for 6 h were 120.6 mAh/g, 124.4 mAh/g, 124.6 mAh/g and 128.6 mAh/g, respectively. After 10 cycles, the specific capacity decrease rates of samples were 13.8%, 11.5%, 9.5% and 6.5%. Thermal treatment at 800℃ for 6 h would be a proper thermal treatment system.

关 键 词：锂离子电池 LIMN2O4 热处理 机械化学 

分 类 号：TM910.4[电气工程—电力电子与电力传动]