掺杂钴对尖晶石型锂锰氧晶体结构及电化学性能的影响  

Effects of Doping Cobalt on Structure and Electrochemical Properties of Spinel Li_xMn_2O_4

作　　者：阎建辉[1] 刘素琴[1] 黄可龙[1] 

机构地区：[1]中南大学功能材料研究所

出　　处：《材料导报》2003年第5期85-87,共3页Materials Reports

基　　金：国家"863"高技术课题(编号:2002AA323100)

摘　　要：用高温固相法合成了尖晶石型LiMn_2O_4和富锂型Li_(1+x)Mn_(2-x)O_4及掺杂Co尖晶石型LiMn_(2-x)Co_yO_4材料,对材料进行了电化学性能,晶格参数及X射线的研究。实验表明,Co的掺入,样品形成了填隙型化合物,其掺杂量对样品的晶体结构及电化学性能有较大的影响。当掺量达0.15时,样品的首次放电容量达129.0mAh·g^(-1),同时充放寿命大有改善。Spinel LiMn_2O_4 and lithium-rich Li1+xMn2-xO4 samples were synthesized by solid phase reaction at high temperature and doping cobalt LiMn2-xCoyO4 samples were prepared. Electrochemical properties and crystalline constants were measured and XRD analysis was made for the samples. The experiment shows that compound of calking was formed by doping cobalt and the doping level important effects on the structure and electrochemical performance. When the doping level is 0. 15,the samples display an initial discharging capacity of up to 129. 0 mAh · g-1 and the life of charge-discharge is also greatly improved.

关 键 词：掺杂 钴 尖晶石型锂锰氧化物 晶体结构 电化学性能 电容量 锂离子电池 正极材料 

分 类 号：TM912[电气工程—电力电子与电力传动] O646.5[理学—物理化学]