One-step preparation of homogeneous single crystal Li-rich cathode materials with encouraging electrochemical performance

The electrochemical properties and microstructure of Li-rich cathode materials Li1.2Mn0.54Co0.13Ni0.13O2 synthesized in one-step were studied. The sample (s-g) was composed of single crystal particles (1 -2 mu m) with regular and smooth surface, and the particle size distribution was concentrated. Compared with the sample (cop) prepared by traditional coprecipitation method, the discharge specific capacity of sample s-g increased from 79.9 mAh g(-1) to 114.5 mAh g(-1) at 10C. After 100 cycles at the rate of 0.1C and 0.2C, the capacity retention rates of sample s-g were 99.48% and 105.36%, while those of sample cop were 66.23% and 71.55%, respectively. Homogeneous single crystal structure and good grain size control greatly released the capacity potential of Li-rich cathode materials and solved the problem of poor rate performance and fast capacity decay. (C) 2020 Elsevier B.V. All rights reserved.