High-nickel ternary positive electrode material having high thermal safety, preparation method therefor, and use thereof

Abstract

The present application provides a high-nickel ternary positive electrode material having high thermal safety. According to the high-nickel ternary positive electrode material provided in the present application, significant factors affecting the thermal safety of the ternary positive electrode material are identified by measuring a thermal conductivity K, a D104 value in XRD, and a porosity α of the material. In addition, corresponding materials are prepared by means of controlling these parameters and satisfying the relationship shown in Formula I for verification. Furthermore, the high-nickel ternary positive electrode material is improved by coating with a coating material having a low thermal conductivity. The thermal conductivity of the coated material is tested, and the results indicate that with an increase in the coating amount of the coating material, the thermal conductivity of the ternary positive electrode material is in overall decrease, and the ternary positive electrode material has a better thermal safety.

Dependencies are inferred from the claim text.