二氧化锰还原法制备锰酸锂前驱体  

Preparation of precursor for LiMn_2O_4 cathode material by multiphase redox method

作　　者：习小明[1] 廖达前[1] 胡柳泉 覃事彪[1] 

机构地区：[1]长沙矿冶研究院金瑞新材料科技股份有限公司,湖南长沙410012

出　　处：《电源技术》2013年第11期1905-1908,共4页Chinese Journal of Power Sources

摘　　要：以二氧化锰为锰源、水合肼或亚硫酸钠为还原剂,在氢氧化锂溶液中,采用二氧化锰还原法,实现了常压水溶液中合成具有尖晶石结构的锰酸锂前驱体。温度实验表明:80℃为二氧化锰还原法合成锰酸锂前驱体的最佳温度。对产物进行XRD、SEM和粒度分析,其结果表明:反应过程中锰酸锂是在二氧化锰表面原位形成的。随着反应的进行和嵌锂程度的提高,产物的比表面积增加,表明电解二氧化锰的还原嵌锂反应具有自催化特性。该方法制备的锰酸锂,均匀性明显提高,微观组分差异基本消除,对推动我国锂离子电池正极材料产业的发展具有促进作用。The synthesis of precursor for spinel LiMn204 was conducted in aqueous solution of LiOH at atmospheric condition by multiphase redox method using Mn02 as manganese raw materials, using hydrazine hydrate or sodium sulphite as reductant. The optimal temperature of synthesizing the precursor for spinel LiMn204 is 80℃. From the microstructure measurement by XRD,particle size and SEM techniques, it is indicated that the LiMnO4 is in situ formed on the surface of MnO2 particles. With the increase in the amount of lithium intemalation, the BET of the sample increases, indicating the self-catalysis characteristics dudng the reduction process of MnO2. The uniformity of LiMn204 prepared by this method is significantly improved, and the differences in micro-components of LiMn204 are almost eliminated, which has a positive role in promoting the development of China＇s cathode material industry for lithium ion battery.

关 键 词：锂离子电池 LIMN2O4正极材料 二氧化锰还原法 前驱体 

分 类 号：TM912.9[电气工程—电力电子与电力传动]