喷雾干燥法制备富锂正极材料及其电化学性能

Preparation and Electrochemical Properties of Li-rich Cathode Material Prepared by Spray Drying Method

用喷雾干燥法制备Li1.2Mn0.54Ni0.13Co0.13O2富锂正极材料并表征其结构、形貌以及电化学性能,研究了烧结温度对材料电化学性能的影响。结果表明:这种正极材料具有良好的层状结构,一次颗粒粒径为100nm左右且分布均匀,样品的首次放电比容量为220.2mAh/g,库伦效率为72.5%,18个循环后容量保持率为96.8%。电化学阻抗和循环伏安特性的测试结果表明,这种正极材料具有良好的电化学性能。

Li-rich cathode material of Li1.2Mn0.54Ni0.13Co0.13O2 was prepared by spray drying method.The structure, morphology and electrochemical properties of the materials were characterized and the effect of sintering temperature on electrochemical properties of the material were investigated. Results show that the cathode material has a good layered structure, the primary particles exhibited rather uniform size distribution with average size of 100 nm. The initial discharge specific capacity of the prepared material can reach 220.2 mAh/g. The coulomb efficiency of the material prepared by sintering at 800℃ can reach 72.5%, and the capacity retention rate can reach 96.8% after 18 cycles. Meanwhile, it also showed good electrochemical performance in electrochemical impedance and cyclic voltammetry.