POSITIVE ELECTRODE ACTIVE MATERIAL, ELECTRODE, BATTERY AND METHOD OF PRODUCING POSITIVE ELECTRODE ACTIVE MATERIAL

The positive electrode active material includes olivine lithium manganese iron phosphate. The olivine lithium manganese iron phosphate includes a first dopant at a manganese-iron site. The first dopant is at least one selected from the group consisting of tungsten and molybdenum. The first site occupancy of the first dopant is 1% to 10% at the manganese-iron site.