5V正极材料LiCr_(0.5)Mn_(1.5)O_4的电化学性能研究  

Study on electrochemical performance of 5 V cathode material LiCr_(0.5)Mn_(1.5)O_4

作　　者：巩桂英[1] 徐宇虹[1] 马萍[1] 张宝宏[1] 

机构地区：[1]哈尔滨工程大学材料科学与化学工程学院,黑龙江哈尔滨150001

出　　处：《电子元件与材料》2007年第11期56-58,共3页Electronic Components And Materials

基　　金：哈尔滨工程大学基础研究基金资助项目(HEUF04064)

摘　　要：采用柠檬酸络合法,制备了尖晶石结构的LiCr0.5Mn1.5O4正极材料。通过循环伏安、电化学阻抗谱、恒流充放电等方法,测试其电化学性能。结果表明:铬离子的加入不但增加了锰离子的平均化合价,有效抑制了Jahn-Teller效应,而且达到了5V的工作电压,稳定了尖晶石结构。材料存在一个活化过程,最大放电比容量达到了145.85mAh·g–1。经过30次充放电循环之后,放电比容量仍然稳定在121.33mAh·g–1,显示了良好的循环性能,为高电位锂离子电池应用提供了良好的应用前景。Spinel cathode material LiCr0.5Mn1.5O4 was prepared by citric acid method and characterized by cyclic voltammetry, electrochemical impedance spectroscopy and constant current charge-discharge. The results show that the addition of Cr^3＋ not only enhanced the average valence of Mn and restrained the influence of Jahn-Teller, but also stabilized the spinel structure and increased operation potential in 5 V. The materials display a process of activation and gave a peak capacity of 145.85 mAh ·g^-1. The discharge capacities remain at 121.33 mAh · g^-1 after 30 of charge-discharge cycles which indicated the better cyclieity and hopeful application in high potential lithium-ion battery.

关 键 词：无机非金属材料 锂锰氧化物 尖晶石 铬离子 正极材料 锂离子电池 

分 类 号：TM912.9[电气工程—电力电子与电力传动]