| 摘要 |
PROBLEM TO BE SOLVED: To use a positive electrode active material in a wide voltage range, to enhance capacity, and to improve charge/discharge cycle durability by constituting the positive electrode active material of Li, Mn, O having a monoclinic crystal layer-shaped rock salt type structure and having a specific composition and one or more kinds of four kinds of metallic elements besides Al. SOLUTION: This positive electrode active material is expressed by LixMnyM1-yO2. Here, M is one or more kinds of Al, Fe, Co, Ni and Cr, and (0<x<=1.1 and 0.5<=y<1) are realized. When manufacturing this active material, an Mn compound and a compound including an element M are water heat- treated at 130 to 300 deg.C in a strong basic aqueous solution including an Li element. In this case, lithium hydroxide is desirable as an Li compound included in the strong basic aqueous solution. When the Mn compound and the compound including the element M are included in this strong basic aqueous solution after being formed as hydroxide, oxide or oxyhydroxide particularly obtained by coprecipitation, a positive electrode active material by uniformly distributing Mn and the element M can be obtained. |
