混料工艺对固相法合成LiNi_(0.5)Mn_(1.5)O_4电化学性能的影响  

Effects of Mixing Process on the Electrochemical Properties of LiNi_(0.5)Mn_(1.5)O_4 Synthesized by Solid-phase Method

作　　者：白钢印 肖方明[2] 唐仁衡[2] 肖志平[2] 丁恒敏[1] 王英[2] 

机构地区：[1]昆明理工大学材料科学与工程学院,昆明650093 [2]广东省工业技术研究院(广州有色金属研究院)稀有金属研究所,广州510650

出　　处：《材料导报》2015年第4期30-33,共4页Materials Reports

基　　金：珠海市战略性新兴产业重大项目(珠科工贸信字[2011]29号);珠海市产学研合作专项(2011A05101003);广东省科技厅计划项目(2009A060800011)

摘　　要：以Li2CO3、MnO2、NiO为原料,用固相法合成了5V尖晶石结构的LiNi0.5Mn1.5O4正极材料;并对合成的样品进行XRD、SEM及电化学性能测试,研究不同混料工艺对固相法合成的高电压正极材料LiNi0.5Mn1.5O4电化学性能的影响。结果表明:采用高速球磨混料方式易获得具有优异电化学性能的样品;球磨时间一定,随着球磨转速增加,合成样品的比容量呈先增加后减小的趋势;转速为350r/min时合成的LiNi0.5Mn1.5O4的电化学性能最佳,0.2C倍率下,首次放电比容量为125.3 mAh/g,100次充放电循环后放电比容量为118.7 mAh/g,容量保持率为94.7%。5 V spinel structured LiNi0.5Mn1.5O4 cathode material was synthesized by solid-phase method, while Li2CO3, MnO2 and NiO was used as raw materials. In order to study effects of different mixing process on electrochemical properties of LiNi0.5Mn1.5O4 synthesized by solid-phase method, the synthesized samples were tested by XRD, SEM and electrochemical measurement. Results showed that：the sample which is obtained by high-speed ball-milling has better electrochemical properties. When ball-milling time is settled, with the increase of ball milling speed, the specific capacity of the samples increases first and then starts to drop. When ball-milling speed is 350 r/min, LiNi0.5Mn1.5O4 has the optimum electrochemical performance,as its initial specific discharge capacity is 125.3 mAh/g （0.2C）, and the specific discharge capacity is 118.7 mAh/g after 100 charge-discharge cycles, with a capacity retain ratio up to 94.7%.

关 键 词：锂离子电池 高电压材料 固相法 混料工艺 电化学性能 

分 类 号：TM912.9[电气工程—电力电子与电力传动]