采用固相配位法制备超细LiMn_2O_4正极材料  

Preparation of ultrafine LiMn_2O_4 cathode materials by solid state coordination method

作　　者：陈立宝[1] 贺跃辉[1] 汤义武 

机构地区：[1]中南大学粉末冶金国家重点实验室 [2]长沙力元新材料股份有限公司,湖南长沙410100

出　　处：《中南大学学报（自然科学版）》2005年第3期390-395,共6页Journal of Central South University:Science and Technology

摘　　要：采用固相配位反应法制备锂离子电池正极材料LiMn2O4,并对配位络合剂用量和反应温度对最终产物的物相、比表面积、粒径和电性能的影响进行研究。研究结果表明采用固相配位法可制备超细LiMn2O4粉末,配位化合物前驱体在550℃时焙烧12h,粉末的粒度细小,粒径在0.06～0.50μm的粉末占82.10%;粉末的平均粒径为138.12nm,比表面积为10.15m2/g,颗粒形貌规则,内部有很多微孔;材料的首次充、放电比容量分别为126.0mA·h/g和124.2mA·h/g,首次充放电效率为98.6%,经15次循环后,材料的容量保持率为91%。The solid state coordination method was used to synthesize ultrafine LiMn2O4 powder. The influences of the volume fraction of citric acid and the calcining temperature on the purity, specific surface area, particle size and electrochemical properties of LiMn2O4 powders were investigated. The ultrafine LiMn2O4 powder with an average particle size of 138.12 nm and a specific surface area of 10.15 m2/g is obtained when the initial materials is calcined at 550°C for 12 h. The powders with the particle size in range of 0.06-0.5 μm account for 82.10%, and the powder show regular morphology and porous internal structure. The first charge and discharge specific capacity of the powders is 126.0 mA·h/g and 124.2 mA·h/g, respectively, the Coulomb efficiency is 98.6%, and the capacity remains 91% after 15 cycles.

关 键 词：固相配位化学 尖晶石LIMN2O4 超细粉末 电极材料 

分 类 号：TM911[电气工程—电力电子与电力传动]