尖晶石LiCo_xMn_(2-x)O_4材料电化学性能研究  

Study on the electrochemical properties of spinel LiCo_xMn_(2-x)O_4

作　　者：李胜军 陈猛[1] 陈增[1] 杨世伟[1] 丛文博[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：《哈尔滨工程大学学报》2006年第6期923-926,共4页Journal of Harbin Engineering University

摘　　要：为了提高LiMn2O4材料的性能，采用分步加热高温固相合法，合成了尖晶石型LiCoxMn2-xO4（x=0、0．04、0．08、0．1、0．12、0．16）材料，并在562247方形实体电池LiCoxMn2-xO4／1MLiPF6—EC＋DEC＋EMC／MCMB体系中研究Co掺杂量对材料性能的影响．通过X射线衍射仪对LiCoxMn2-xO4材料结构进行了研究，发现随着Co掺杂量的增加，LiCoxMn2-xO4材料的晶胞参数不断变小，结构稳定性增加，循环性能得到提高，但材料的起始放电比容量不断减小，Co掺杂量为0．08～0．1时，材料的起始比容量较高，循环性能也均得到较大的提高．经过1000次循环，材料的放电容量保持率在85％左右．Co的掺杂也提高了材料的高温性能及大电流工作能力，4倍率充放电时，放电容量为1倍率时的86％．To improve the properties of spinel LiMn2O4, the LiCoxMn2-xO4 （x = 0,0.04,0.08,0.1,0.12, 0.16） was prepared by high temperature solid-phase reaction. The effect of doped-Co was studied in 562247 prismatic lithium ion battery-LiCoxMn2-xO4 / 1M LiPF6- EC＋ DEC＋ EMC/MCMB. The structure of the cathode material was studied by means of XRD. The result shows that the lattice parameter of LiCoxMn2-xO4 becomes smaller as X but becomes larger, the structure of the cathode material is more stable and has better cycle property,but the first discharge capacity becomes smaller. When the doped-Co is controlled between 0.08 and 0.1, the cathode material has lager specific capacity and better cycle property. After 1000 cycles, about 85% of the capacity is maintained. The properties at high temperature and high charge-recharge rates are also increased by the doped Co. At 4C rate, the spinel LiCo0.1Mn1. 9O4 can give 86% of capacity at 1C rate.

关 键 词：方形锂离子电池 阴极材料 尖晶石LiCoxMn2-xO4 电化学性能 

分 类 号：TM912.9[电气工程—电力电子与电力传动]