| 摘要 |
Provided are a positive electrode active material for nonaqueous secondary batteries that is capable of supplying a nonaqueous secondary battery high in capacity, energy density and rate characteristic; and a method for producing the active material, using a polyanionic active material. The method is a method for producing a positive electrode active material for nonaqueous secondary batteries, the positive electrode active material being represented by a chemical formula of A x MD y O z wherein A is an alkali metal or an alkaline earth metal, M is one or more metal elementscomprising at least one transition metal element, D is a typical element being covalently bondable to oxygen O to form an anion, and x, y and z, respectively, satisfy the relationships 0 ‰¤ x ‰¤ 2, 1 ‰¤ y ‰¤ 2 and 3 ‰¤ z ‰¤ 7. The method includes the steps of mixing raw materials of the positive electrode active material with each other, pre-calcining the mixed raw materials in an oxidizing atmosphere at a temperature of 400°C or higher, mixing carbon or an organic substance with a pre-calcinated material yielded through the pre-calcining step, and the step of calcining the pre-calcinated material, with which the carbon or the organic substance is mixed in a reducing atmosphere or an inert atmosphere. |
