摘要
以水热法制备的Li-Ni-Co-Mn-O锂化前驱体为原料,采用两段煅烧法合成了具有α-NaFeO_2型结构的LiNi_(0.5)Co_(0.2)Mn_(0.3)O_2正极材料,通过X射线衍射分析(XRD)、扫描电子显微镜(SEM)和电化学性能测试对不同低温预处理温度制备的正极材料进行了表征。研究结果表明:低温预处理温度为500℃时,制备的正极材料LiNi_(0.5)Co_(0.2)Mn_(0.3)O_2具有最优的电化学性能,在3.0~4.3V电压范围内,0.1C下初始容量为169.4mAh/g,0.5C倍率下50次循环后放电比容量为145.3mAh/g,容量保持率高达95.5%。
The cathode material Li LiNi0.5Co0.2Mn0.3O2 with a α-NaFeO2 structure was synthesized through a two-step calcination process with the lithiated precursor of Li-Ni-Co-Mn-O prepared by a hydrothermal process as a raw material.Then,the synthesized cathode materials with pretreatment at different temperatures were characterized by X-ray diffraction（XRD）,scanning electron microscope（SEM） and electrochemical properties analyses. Results show that after pretreatment at a temperature of 500 ℃,the synthesized cathode material LiNi0.5Co0.2Mn0.3O2 exhibits a better electrochemical performance. It delivers a reversible specific capacity of 169.4 m Ah/g in the 1st cycle at 0.1C over 3.0 ~4.3 V and a discharge specific capacity of 145.3 m Ah/g at 0.5C after 50 cycles,with capacity retention up to 95.5%.
出处
《矿冶工程》
CSCD
北大核心
2017年第3期118-121,128,共5页
Mining and Metallurgical Engineering
基金
广西自治区"八桂学者"专项经费资助计划(2011A025)
关键词
锂离子电池
正极材料
低温预处理
电化学性能
lithium ion battery
cathode material
low-temperature pretreatment
electrochemical properties
