CORE-SHELL GRADIENT TERNARY PRECURSOR, AND PREPARATION METHOD THEREFOR AND USE THEREOF

Provided in the present application is a core-shell gradient ternary precursor, and a preparation method therefor and the use thereof. The preparation method comprises the following steps: (1) mixing a terephthalic acid solution and an alkali solution to obtain a terephthalate solution, adding a nickel source solution thereto for a reaction to obtain a Ni-MOF solution, mixing the Ni-MOF solution with ammonia water, and adjusting the pH to obtain a base solution; and (2) simultaneously adding a nickel-cobalt-manganese ternary mixed salt solution, a liquid alkali solution and an ammonia water solution into the base solution obtained in step (1) for a coprecipitation reaction, and subjecting same to an aging treatment to obtain the core-shell gradient ternary precursor. In the present application, Ni-MOF is prepared in advance, and is used as a core to undergo the coprecipitation reaction, so as to prepare the core-shell gradient precursor. During the process of preparing a positive electrode material from the core-shell gradient ternary precursor, carbon in the core reacts with oxygen, such that the oxidation state of nickel on a particle surface decreases, and the generation of cracks is reduced.