POSITIVE ELECTRODE ACTIVE MATERIAL FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERY, METHOD FOR PRODUCING THE SAME, AND POSITIVE ELECTRODE FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERY MANUFACTURED USING THE POSITIVE ELECTRODE ACTIVE MATERIAL

摘要

PROBLEM TO BE SOLVED: To provide: a positive electrode active material for a nonaqueous electrolyte secondary battery, improving initial discharge capacity and capable of suppressing deterioration in average operating voltage; a method for producing the positive electrode active material for a nonaqueous electrolyte secondary battery; and a positive electrode for a nonaqueous electrolyte secondary battery manufactured using the positive electrode active material.SOLUTION: A positive electrode active material for a nonaqueous electrolyte secondary battery comprises: a lithium transition metal composite oxide 21 that contains at least lithium, nickel and manganese and has a layered structure; and a compound 22 of a rare earth element adhering on at least a part of the surface of the lithium transition metal composite oxide 21. The average particle size of the compound 22 of a rare earth element is more than 100 nm and 500 nm or less.