METHOD FOR SEPARATING TRANSITION METAL AND LI FROM COMPOUND CONTAINING LI AND TRANSITION METAL

A disclosed method for separating a transition metal and Li includes: a step of dissolving a compound containing Li and a transition metal in a carboxylic acid, to obtain a first solution containing Li ions, Ni ions, and carboxylic acid anions; a step of adding an alkali to the first solution, to obtain a second solution containing Li ions, and a precipitate containing a transition metal carboxylate; and a step of separating the precipitate from the second solution. The transition metal is at least one selected from the group consisting of Ni, Co, Mn, Ti, Fe, and Cu.