Modified titanium niobate coated ternary positive electrode material as well as preparation method and application thereof

The invention relates to the technical field of lithium ion batteries, in particular to a modified titanium niobate coated ternary positive electrode material and a preparation method and application thereof. The preparation method of the modified titanium niobate coated high-nickel ternary positive electrode material comprises the following steps: uniformly mixing a high-nickel ternary precursor and a lithium source, and sintering to obtain the high-nickel ternary positive electrode material, weighing a titanium source, a niobium source and metal salts of doped elements according to the stoichiometric ratio of the coating material, dissolving the titanium source, the niobium source and the metal salts in a solvent to form a metal salt solution, adding a complexing agent into the metal salt solution, and performing gelatinization treatment to obtain a coating gel material; and uniformly mixing the high-nickel ternary positive electrode material and the coated gel material, and calcining to obtain the modified