熔盐法制备梯度型LiNi_xCo_yMn_(1-x-y)O_2电极材料的研究

Study on the Concentration-gradient LiNi_xCo_yMn_(1-x-y)O_2 Electrode Material Prepared in the Molten Salt Method

采用熔盐法在不同温度下制备出层状浓度梯度型LiNi1-x-yCoxMnyO2正极材料。经XRD,SEM实验分析表明:材料具有典型的α-NaFeO2层状结构,粒径在200～400nm之间。在2.75～4.5V充放电电压范围内测试,800℃得到的材料首次放电比容量为166.8mAh/g,保持率为99%;同时,在2C电流以内充放电,该材料表现出较稳定的倍率性能。

The layered cathode material LiNi1-x-yCoxMnyO2 was prepared at different temperatures in the molten salt method.Experiments were carried out to test the charge and discharge properties of the material.The XRD and SEM experiments show that the prepared material has a typical α-NaFeO2 layered structure with the particles diameter range from 200nm to 400 nm.The capacity of the prepared material at 800℃ is 166.8mAh/g with a retention of 99% in the first charge-discharge cycle,tested within the voltage cut off limits of 2.75 and 4.5 V.Besides,the results show that the material demonstrates a good rate capability.