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 LiNi0.5Mn1.5O4 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 LiNi0.5Mn1.5O4 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, LiNi0.5Mn1.5O4 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%.
出处
《材料导报》
EI
CAS
CSCD
北大核心
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)
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
lithium-ion batteries, high voltage material, solid phase method, mixing process, electrochemical properties
