锂离子电池正极材料Li_(1.05)Ni_(0.5)Mn_(0.45)O_2合成及电化学性能  

Systhesis and electrochemical properties of Li_(1.05)Ni_(0.5)Mn_(0.45)O_2 as cathode material for lithium ion batteries

作　　者：罗垂意 李之锋[1] 钟盛文[1] 张骞[1] 王春香[1] LUO Chui-yi;LI Zhi-feng;ZHONG Sheng-wen;ZHANG Qian;WANG Chun-xiang(Jiangxi University of Science and Technology,Ganzhou Jiangxi 341000,China)

机构地区：[1]江西理工大学,江西赣州341000

出　　处：《电源技术》2018年第9期1273-1275,共3页Chinese Journal of Power Sources

基　　金：国家自然科学基金(51373104);江西省科技计划项目(20141BBE50019);江西省对外科技合作项目(20123BDH8 0016)

摘　　要：采用氢氧化物共沉淀-高温固相法合成了Li_(1.05)Ni_(0.5)Mn_(0.45)O_2正极材料;利用X射线衍射光谱法(XRD)和扫描电子显微镜法(SEM)分别表征材料晶体结构和形貌,并采用恒流充放电和电化学阻抗(EIS)研究了材料的电化学性能。结果表明,840℃下保温15 h合成的正极材料,室温条件下以0.2 C倍率在2.75~4.6 V电压范围,首次放电比容量为181.74 m Ah/g,循环50次后容量保持率为93.74%。Li1.05Ni0.5Mn0.45O2 was synthesized through mixing LiOH·H2O with Ni0.53Mn0.47(OH)2 precursor pre-pared by hydroxide co-precipitation method.The morphologies and crystal structure of Li1.05Ni0.5Mn0.45O2 were characterized by SEM and XRD,respectively.The electrochemical properties were also investigated by galvanostatic chargedischarge cycling and electrochemical impedance spectroscopy(EIS).The results showed that the Li1.05Ni0.5Mn0.45O2 synthesized at 840℃for 15 h exhibited cycling capability at 2.75~4.6 V with 0.2 rate.The Li1.05Ni0.5Mn0.45O2 achieved an initial discharge specific capacity of 181.74 mAh/g,and capacity retention was 93.74%after 50 cycles.

关 键 词：锂离子电池 正极材料 富锂 电化学性能 

分 类 号：TM912[电气工程—电力电子与电力传动]