Y改性对LiMn_2O_4结构及电化学性能的影响  

The effect of Y modification on structure andelectrochemical performance of LiMn_2O_4

作　　者：张胜利[1] 陈小娜[1] 宋延华[1] 张利波[1] 闫继[1] 

机构地区：[1]郑州轻工业学院材料与化学工程学院,河南郑州450002

出　　处：《中国锰业》2007年第1期30-32,44,共4页China Manganese Industry

基　　金：河南省科技攻关项目(0424210024)

摘　　要：采用控制沉淀速度法,制备前驱体,固相法掺杂钇,合成了锂离子电池正极材料LiMn2-xYxO4,并对其结构和电化学性能进行了研究。XRD、红外测试结果表明,随着Y含量的增加,材料LiMn2-xYxO4(X=0.00、0.005、0.02、0.05)的晶格参数a逐渐变小,Mn-O键吸收峰逐渐增强,使得材料晶胞收缩,晶格结构得到稳定。交流阻抗与恒流充放电测试表明,材料LiMn1.98Y0.02O4显示了较小的电化学反应阻抗和较好的循环性能,在0.1C恒流活化放电下,其初始放电比容量为122.2 mAh/g,30次0.2C恒流充放电循环后容量保持率为90.0%。Li-ion battery cathode material LiMn2- xYxO4 was synthesized by solid Y-doped method, and precursor was prepared by controlling the rate of depositting. The structure and electrochemical properties of the material were studied by XRD, Fourier infrared absorb,A. C. Impedance and charge--dischargetes test. The results show crystal lattice parameter a of LiMn2-xYxO4（X = 0.00,0.005,0.02,0.05）was diminished gradually, absorb apices of M n - O bond swelled gradually, following the increasing of Y. Shrinking of crystal lattice made it more stably. The materials of LiMn1.98 Y0.02 04 shows lower electrochemical Impedance and excellent cycle electrochemical properties, with the first discharge specific capacity of 122.2 mAh/g at the constant current 0.1C and capacity retaining 90.0% at the constant current 0.2C after 30 cycles.

关 键 词：Y改性 LIMN2O4 结构 电化学性能 

分 类 号：TM912.9[电气工程—电力电子与电力传动]