Layer-structured spherical cathode material

LiNi1-x-yCoxMnyO2

with high purity can be prepared by co-precipitation with high efficiency and low energy consumption. This method has been widely applied in both fundamental research and industrial production

mainly including co-precipitation and high-temperature calcination processes. The mechanisms and influence factors involved in each procedure were elaborated and analyzed. The nucleation process and the complexation and precipitation reactions of Ni

Co and Mn ions were investigated in the key step of co-precipitation for the preparation of precursor. Based on the established equilibrium equations of reactions and thermodynamics

the two-dimensional variations of the three non-precipitated metal concentrations and their mutual ratios for different pH and amounts of NH3 were thoroughly analyzed. Through the analysis results

theoretical optimum conditions for the cathode material with desired metal-ion ratios were thus proposed for the first time. In addition

by means of analyzing the structural characteristics of the precursor and cathode material as well as the electrochemical activity of the final material

the proper operation conditions were qualitatively investigated. Finally

the scientific method for optimizing the process conditions of LiNi1-x-yCoxMnyO2 cathode material was prospected.