喷雾干燥法制备LiNi<sub>0.5</sub>Co<sub>0.2</sub>Mn<sub>0.3</sub>O<sub>2</sub>正极材料及其性能研究

Abstract

采用喷雾干燥法合成了LiNi0.5Co0.2Mn0.3O2正极材料。XRD表明样品均为纯相，无其它杂相存在。SEM研究表明，各样品均为类球形结构，温度升高颗粒粒径增大。电化学研究表明，900℃下合成的样品具有最优的电化学性能，该样品在0.1C倍率下的首次放电比容量为163.0 mAh∙g−1，循环50次后的容量保持率为92.6%。 LiNi0.5Co0.2Mn0.3O2 cathode materials were synthesized by the spray-drying method. XRD results reveal that the samples are pure phase and no impurities are detected. SEM results indicate that the samples show similar spherical particles. The particle size increases with the synthesis tem-perature. Electrochemical tests show that the sample synthesized at 900˚C exhibits the best elec-trochemical performance. The sample shows the initial discharge specific capacity of 163.0 mAh∙g−1 at 0.1C rate and possesses the capacity retention of 92.6% after 50 cycles.