Positive electrode active material for nonaqueous electrolyte secondary batteries, method for producing the same, positive electrode for nonaqueous electrolyte secondary batteries incorporating the positive electrode active material, and nonaqueous electrolyte secondary battery incorporating the positive electrode

Abstract

A positive electrode active material according to an aspect of the present invention for nonaqueous electrolyte secondary batteries contains a lithium transition metal composite oxide that has a compound in contact with its surface, the compound containing a rare earth metal and silicic acid and/or boric acid. A positive electrode according to an aspect of the present invention has a positive electrode collector and a positive electrode mixture layer formed on at least one surface of the positive electrode collector. The positive electrode mixture layer contains a positive electrode active material, a binder, and a conductive agent. The positive electrode active material contains a lithium transition metal composite oxide that has a compound in contact with its surface, the compound containing a rare earth metal and silicic acid and/or boric acid.