Effect of sintering temperature on the electrochemical performance of Li-rich Mn-basfed cathode material Li1.2Mn0.54Ni0.13Co0.13O2 by co-precipitation method

The multi-void spherical structure of Li-rich Mn-based cathode materials was successfully prepared with an improved co-precipitation method using acetate as the system. By XRD, TEM, and SEM characterization and observation, the materials at the sintering temperature of 800℃ have a favorable crystal structure and lamellar structure, and it has more uniform primary particle and secondary particle morphology under SEM. The electrochemical results show that the initial discharge capacity of LMNCO-800 at 0.1C is 239.2 mAh/g. At high rates of 0.5C and 2C, it can provide capacities of 200.2 mAh/g and 145.0 mAh/g, and the capacity retention rates of 200 cycles are 85.11% and 88.21%, respectively. It can be seen more intuitively from the capacity decay and dQ/dV diagrams at 1C that the capacity decay trend of the material is more stable when the sintering temperature is 800℃, which is more helpful to stabilize the structure and delay the transformation of the layered structure to the spinel structure.