高密度锂离子电池正极材料LiCoO_2前驱体的制备  

Preparation of high density precursor used for cathode of lithium battery

作　　者：常照荣[1] 李华吉[1] 汤宏伟[1] 吕豪杰[1] 

机构地区：[1]河南师范大学化学与环境科学学院,河南新乡453007

出　　处：《功能材料》2009年第5期748-751,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(20671031)

摘　　要：用化学沉淀法(CP)合成出了锂离子电池正极材料前驱体。研究了干燥方式、反应物浓度、滤饼含水量等因素对前驱体组成及振实密度的影响。结果表明,干燥方式以及滤饼的含水量和NaOH浓度对产物的振实密度影响最大。最佳条件下可以得到振实密度为1.92g/cm3的产物。用此前驱体和LiNO3-LiOH低共熔盐制得的产物LiCoO2振实密度达到2.95g/cm3,高于球形LiCoO2(2.8g/cm3)正极材料。用此前驱体制得的LiCoO2正极材料I003/I104达到26.65,首次充放电比容量为157和151mAh/g。High tap density precursor used for cathode material was prepared by chemical precipitation（CP） method. Effects of the concentration of sodium hydroxide solution, drying method, the content of water on the tapping density and their effects on the average valance of cobalt were discussed. The present study has indicated that the concentration of sodium hydroxide solution, drying method and the content of water have largely effects on the tapping density. By controlling conditions we can obtain the precursor which tapping density is 1.92g/ cm^3. LiCoO2 powders have been synthesized using high tap density precursor and eutectic molten salt. The tapdensity of the powder is 2. 95g/cm^3 , which is remarkably higher than the spherical LiCoO2 powders（only 2.80g/ cm^3）. The I003/I04 value of LiCoO2 is 26.65,its initial discharge capacity is 151mAh/g.

关 键 词：二次干燥法 高密度 正极材料 前驱体 

分 类 号：TM912[电气工程—电力电子与电力传动] O646[理学—物理化学]