Method for preparing ternary hydroxide precursor

The invention provides a method for preparing a ternary hydroxide precursor, wherein the method includes the steps: preparation of an initial solution: dissolving ternary positive electrodes of wastelithium ion batteries to obtain the initial solution; preparation of an intermediate solution: removing a suspended matter to obtain the intermediate solution; adjustment of the concentration of the intermediate solution: adding nickel, cobalt and manganese soluble inorganic salts to the intermediate solution, and adjusting the concentration of ternary ions in the intermediate solution; preparation of the ternary hydroxide precursor by the following steps: introducing inert gas into a reaction kettle with a base solution, and adding an anionic surfactant to an alkali solution prepared by sodium hydroxide and ammonia water to prepare a mixed solution; and preparation of the ternary hydroxide precursor: carrying out a co-precipitation reaction of the ternary ion solution and the mixed solution in the reaction kettle