(1. 湘潭大学 化学学院，湘潭 411105；
2. 深圳市贝特瑞新能源材料股份有限公司，深圳 518106；
3. 华南师范大学 物理与电信工程学院，广州 510631)
摘 要: 采用喷雾干燥法制备锂离子电池用层状富锂锰基正极材料Li(1+x)Ni0.166Co0.166Mn0.667O(2.175+x/2)(x=0.3，0.4，0.5，0.6)，通过X射线衍射(XRD)、扫描电子显微镜(SEM)、等离子体发射光谱(ICP)、热重-差热分析(TG-DSC)、比表面积、粒度分布和恒流充放电等测试手段对材料的结构、形貌及电化学性能进行表征。结果表明：所制得的富锂锰基正极材料为三方层状结构( )的 LiNi1/3Mn1/3Co1/3O2和单斜层状结构(C2/m)的Li2MnO3组成的固溶体，且具有多孔球形形貌。当x=0.4时，材料具有最优的电化学性能。在2.0~4.8 V电压范围内，25 mA/g电流密度下材料的首次放电比容量高达277.5 mA？h/g，20周循环后容量保持率达95.3%，500 mA/g电流密度下放电比容量仍达192.5 mA？h/g。
关键字: 锂离子电池；正极材料；富锂锰基；喷雾干燥法
（1. School of Chemistry, Xiangtan University, Xiangtan 411105, China;
2. Shenzhen BTR New Energy Materials Inc., Shenzhen 518106, China;
3. School of Physics and Telecommunication Engineering, South China Normal University, Guangzhou 510631, China）
Abstract:The layered lithium-riched manganese-based cathode materials Li(1+x)Ni0.166Co0.166Mn0.667O(2.175+x/2) (x=0.3, 0.4, 0.5, 0.6) for Li-ion batteries were synthesized by spray drying method. The structures, morphologies and electrochemical performance of the as-prepared materials were characterized by X-ray diffractometry (XRD), scanning electron microscopy (SEM), inductively coupled plasma (ICP), thermo-gravimetric/differential scanning calorimeter analysis (TG/DSC), specific surface area, particle size distribution and galvanostatic charge-discharge tests. The results indicate that the obtained lithium-riched manganese-based cathode materials consist of the layered trigonal LiNi1/3Mn1/3Co1/3O2 phase ( ) and monoclinic Li2MnO3 phase (C2/m), and show the special porous spherical morphology. When x is 0.4, the cathode shows the best electrochemical performance. It exhibits the initial discharge capacity of 277.5 mA？h/g and the capacity retention after 20 cycles reaches 95.3% between 2.0 and 4.8 V at current density of 25 mA/g. The discharge capacity of the cathode still approaches to 192.5 mA？h/g, even when the cathode is cycled at 500 mA/g.
Key words: lithium ion battery; cathode material; lithium-riched manganese based; spray drying
