Preparation of LiNi0.5Co0.2Mn0.3O2 by freeze-drying method

Abstract

LiNi 0.5 Co 0.2 Mn 0.3 O 2 cathode materials have many advantages such as excellent safety performance and huge specific capacity. The advantages have attracted attention from industry and academia. At present, solid-phase method and co-precipitation method were widely used, but there were some drawbacks during the manufacturing process, occasioning the broke cycle performance. In this paper, the effects of freeze-drying method, solid-phase method, and co-precipitation method on the electrochemical performance of LiNi 0.5 Co 0.2 Mn 0.3 O 2 cathode materials were studied. Compared with the other samples, the LiNi 0.5 Co 0.2 Mn 0.3 O 2 cathode materials prepared via freeze-drying method exhibited the best electrochemical performance in the half-cell testing. After 100 cycles at 0.1 C, the discharge specific capacity was 151.89 mAh g −1 , which was 34.1 mAh g −1 higher than that of solid-phase method. The capacity retention rate was 84.17%. It also showed excellent electrochemical performance at 5 C. The first discharge specific capacity was 149.56 mAh g −1 and the capacity retention rate was 84.17%. The experimental results showed that freeze-drying method could effectively improve the electrochemical performance. LiNi0.5Co 0.2 Mn 0.3 O 2 cathode materials with the unique cubic-like structures were prepared by freeze-drying method. It is noted that electrochemical performance of the cathode material prepared via this method was significantly better than traditional method.