Preparation method of fluorine-phosphorus co-doped high-nickel ternary lithium ion positive electrode material

The invention relates to preparation of a high-nickel ternary lithium ion battery positive electrode material, and a fluorine-phosphorus doping modification method. The preparation method comprises the following steps blending a ternary metal oxide solid in proportion, mixing with a lithium hydroxide solution added with a chelating agent citric acid, stirring, carrying out ultrasonic treatment, carrying out planetary ball milling, and carrying out high-temperature sintering on the precursor in a muffle furnace to obtain a high-nickel ternary material; and putting a lithium hexafluorophosphatesolution into the alcohol dispersion liquid of the high-nickel ternary material in proportion, carrying out ultrasonic treatment after magnetic stirring, putting the mixture into a muffle furnace, andcarrying out high-temperature sintering to obtain the fluorine-phosphorus-doped high-nickel ternary material. According to the invention, the high-nickel ternary positive electrode material is prepared by adopting a rheologic