| abstract |
(57) [Summary] [Problem] To provide a positive electrode active material that is excellent in homogeneity and can improve battery characteristics, and uses a positive electrode active material and has a high capacity and excellent repetition characteristics in a lithium ion secondary battery. Provide batteries. A LiCo (1-y) Mn y O 2 (0.01 ≦ y ≦ 0.3) water-soluble salts of lithium, cobalt, and manganese and citric acid are mixed in a solution so as to have a composition ratio of ≦ 0.3), and then the solvent is removed to form a gel, and the obtained gel is dried. Thus, a precursor is generated, and the precursor is fired to obtain a positive electrode active material. |