POSITIVE ELECTRODE ACTIVE MATERIAL, ELECTRODE AND BATTERY

The positive electrode active material includes olivine lithium manganese iron phosphate. The olivine lithium manganese iron phosphate includes a dopant at a manganese-iron site. At the manganese-iron site, the dopant satisfies a relationship of "dFe-X < dMn-X". The term "dFe-X" represents a nearest-neighbor atomic distance between the dopant and iron. The term "dMn-X" represents a nearest-neighbor atomic distance between the dopant and manganese.