5V正极材料LiMg_xNi_(0.5-x)Mn_(1.5)O_4的电化学性能研究  

Study on electrochemical performance of 5V cathode materials LiMg_xNi_(0.5-x)Mn_(1.5)O_4

作　　者：朱振华[1] 胡航[1] 殷康健 郑圣泉 陈红雨[1,3] 

机构地区：[1]华南师范大学化学与环境学院,广东广州510006 [2]株洲泰和高科技有限公司,湖南株洲412000 [3]广东高校储能与动力电池产学研结合示范基地,广东广州510006

出　　处：《电源技术》2015年第3期469-471,共3页Chinese Journal of Power Sources

摘　　要：通过Sol-Gel法,采用马来酸作为络合剂合成了正极材料LiMgxNi0.5-xMn1.5O4(x=0、0.025、0.05和0.1),对产物进行了X射线衍射(XRD)、扫描电镜(SEM)表征和电化学性能测试,结果表明产物均为Fd3m型尖晶石结构,掺杂一定量Mg2+的LiNi0.5Mn1.5O4并未改变原有的结构;掺杂后的产物形貌和粒径发生了明显的变化;在1 C下循环50次后,掺杂Mg2+的样品的循环性能和容量保持率比未掺杂之前的好;Mg2+的掺入并未影响LiNi0.5Mn1.5O4的电化学反应过程。5 V LiNi0.5Mn1.5O4 spinel cathode materials were successfully synthesized by a maleic acid-assisted sol-gel reaction. The structure, morphology and electrochemical properties of the materials were examined by X-ray diffraction, scanning electron microscopy and electrochemical tests. The results show that the as-synthesized LiNi0.5Mn1.5O4 are crystallized in spinel structure with Fd3 m space group. Doping with certain amount of Mg2＋ did not change the basic structure of LiNi0.5Mn1.5O4 but greatly affected its mophology and particle size. At the chargedischarge rate of 1 C, the electrochemical performance of Mg-doped LiNi0.5Mn1.5O4 showed better cyclic performance and higher capacity retention rate than the pure LiNi0.5Mn1.5O4 after 50 cycles. Doping with Mg2＋ also did not affect the electrochemical reaction process of LiNi0.5Mn1.5O4.

关 键 词：SOL-GEL法 Mg2+ 循环性能 容量保持率 

分 类 号：TM912[电气工程—电力电子与电力传动]