锂离子电池正极材料LiMg_xMn_(2-x)O_4的合成及性能  

Preparation and characterization of cathode material LiMg_xMn_(2-x)O_(4) for lithium ion battery

作　　者：刘长久[1] 柴小琴[1] 陈永龙[1] 

机构地区：[1]桂林工学院材料与化学工程系,广西桂林541004

出　　处：《桂林工学院学报》2006年第1期82-85,共4页Journal of Guilin University of Technology

基　　金：广西科学基金资助项目(桂科基0342004-2)

摘　　要：利用相转移法合成了LiMgxMn2-xO4前驱体,在电炉中于一定温度下烧结一定时间,得到锂离子电池正极材料粉体,并利用XRD、SEM、IR等对材料粉体进行结构形态表征.考察焙烧温度、焙烧时间、Mg的掺杂含量等对产物结构和电化学性能的影响.实验结果表明:当Mg的掺杂量x=0.06,于750℃焙烧15 h时所制备的样品材料结构稳定且呈尖晶石型,样品电极的充放电性能良好,首次放电比容量达125 mAh/g,放电平稳,样品电极可逆循环性能良好.Precursor LiMgxMn2-xO4 is prepared by the method of phase transfer, and then the precursor is sintered in the air astrosphere at a certain temperature for a certain time to get cathode material for lithium ion battery. By XRD, SEM and IR, cyclic voltammeter and charging- discharging experiments are made respectively to analyze the effects of the synthesis condition on the structure and electrochemical performance. When x = 0. 06 and the precursor is sintered at 750℃ for 10 h, the synthesized materials have obvious spinel structure.The sample electrode has better cyclic reversibility, and its first discharging specific capacity is 125 mAh/g.

关 键 词：锂离子电池 相转移法 LiMgxMn2-xO4 正极材料 电化学性能 

分 类 号：TM912.9[电气工程—电力电子与电力传动]