HIGH-NICKEL TERNARY POSITIVE ELECTRODE MATERIAL HAVING HIGH THERMAL SAFETY, PREPARATION METHOD THEREFOR, AND USE THEREOF

The present invention 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 invention, significant factors affecting the thermal safety of a 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 a relational expression as 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. Tested thermal conductivity results of the material indicate that along with an increase in a coating amount of the coating material, the thermal conductivity of the ternary positive electrode material is reduced overall, and the ternary positive electrode material has a better thermal safety. La p