锂离子电池正极材料LiMn_2O_4的Al_2O_3包覆研究  

Study of Al_2O_3 coated LiMn_2O_4 as a cathode material for lithium ion batteries

作　　者：段飞[1] 杜真真[1] 杨鹏[1] 陈鹏[1] 仲双双[1] 张大伟[1] 

机构地区：[1]合肥工业大学化学工程学院,安徽合肥230009

出　　处：《合肥工业大学学报（自然科学版）》2013年第3期346-351,共6页Journal of Hefei University of Technology：Natural Science

基　　金：安徽省教育厅产学研重点资助项目(2009AJZR0603;2011AKKG1122);中央高校基本科研业务费专项资金资助项目(2011HGQC1002)

摘　　要：文章采用高温固相法合成尖晶石LiMn2O4,并采用液相包覆的方法对其进行改性处理。采用XRD、SEM、XPS以及电池测试系统等,研究了所制备材料的结构、组成、性能和包覆机理。实验结果表明:表面处理后的LiMn2O4循环性能显著提高,以A12O3对尖晶石LiMn2O4进行表面包覆,使LiMn2O4颗粒不与电解液直接接触,可以防止锰离子溶解在电解液中,获得结构稳定、循环性能优异的锂离子电池正极材料;同时Al2O3会和电解液中微量的HF反应,减小了HF对锰离子溶解的加速作用。Spinel LiMn2O4 was synthesized by high temperature solid state method and modified by liquid coating.The structure,composition,performance and coating mechanism of spinel LiMn2O4 were investigated by XRD,SEM,XPS and electrochemical methods.The results show that the cycling performance of LiMn2O4 is clearly improved by the modification of Al2O3.The surface treatment minimizes the electrolyte oxidization by placing a barrier between the spinel LiMn2O4 and electrolyte,which reduces the solution of Mn ions in the electrolyte.As a cathode material for lithium ion batteries,the structure of LiMn2O4 is stable and the cycling performance of it is good.The layer of Al2O3 can also react with micro-HF in electrolyte,which drastically decreases the solution of Mn ions.

关 键 词：锂离子电池 LiMn2O4材料 表面包覆 三氧化二铝 

分 类 号：TQ152[化学工程—电化学工业]