(1. 湘潭大學 化學學院，湘潭 411105；
2. 深圳市貝特瑞新能源材料股份有限公司，深圳 518106；
3. 華南師范大學 物理與電信工程學院，廣州 510631)
摘 要: 采用噴霧干燥法制備鋰離子電池用層狀富鋰錳基正極材料Li(1+x)Ni0.166Co0.166Mn0.667O(2.175+x/2)(x=0.3，0.4，0.5，0.6)，通過X射線衍射(XRD)、掃描電子顯微鏡(SEM)、等離子體發(fā)射光譜(ICP)、熱重-差熱分析(TG-DSC)、比表面積、粒度分布和恒流充放電等測試手段對材料的結構、形貌及電化學性能進行表征。結果表明：所制得的富鋰錳基正極材料為三方層狀結構( )的 LiNi1/3Mn1/3Co1/3O2和單斜層狀結構(C2/m)的Li2MnO3組成的固溶體，且具有多孔球形形貌。當x=0.4時，材料具有最優(yōu)的電化學性能。在2.0~4.8 V電壓范圍內，25 mA/g電流密度下材料的首次放電比容量高達277.5 mA？h/g，20周循環(huán)后容量保持率達95.3%，500 mA/g電流密度下放電比容量仍達192.5 mA？h/g。
關鍵字: 鋰離子電池；正極材料；富鋰錳基；噴霧干燥法
（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
