摘要
以氨水和NaO H为络合剂和沉淀剂,采用氢氧化物共沉淀法合成了锂离子电池正极材料Li1.17Mn0.48Ni0.23Co0.12-MgxO2(x=0,0.01,0.02,0.03,0.05)。并利用X射线衍射光谱法(XRD)、扫描电子显微镜法(SEM)和电化学测试对其晶体结构、形貌和电化学性能进行了表征。研究表明:掺杂适量的Mg能够降低材料的阳离子混排度,改善材料的循环性能。Li1.17Mn0.48Ni0.23Co0.12Mg0.03O2具有最优的电化学性能,在0.1 C(1 C=358 mA h/g)下首次放电比容量为234.7 mA h/g,在0.1 C下循环10次后容量保持率为99.3%。
The cathode material Li1.17Mn0.48Ni0.23Co0.12Mg O2 （ =0, 0.01, 0.02, 0.03, 0.05） for lithium ion batteries was synthesized by hydroxide co-precipitation using NaOH and ammonia as precipitating agent and chelating agent. The crystal structure, morphology and electrochemical properties were characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM） and electrochemical tests. The research indicates that the cation mixing degree decreases after Mg doping, and the cycle performance of the materials are improved. Li1.17Mn0.48Ni0.23Co0.12Mg0.03O2 shows the best electrochemical properties. It delivers the discharge special capacity of 234.7 mAh/g at 0.1 （1 =358 mAh/g）, and has the capacity retention of 99.3%after 10 cycles at 0.1 .
出处
《电源技术》
CAS
CSCD
北大核心
2015年第4期691-693,共3页
Chinese Journal of Power Sources
关键词
富锂材料
Mg掺杂
电化学性能
锂离子电池
lithium rich material
Mg doping
electrochemical properties
lithium ion battery
