POSITIVE ELECTRODE ACTIVE MATERIAL FOR ALKALINE SECONDARY BATTERY AND ALKALINE SECONDARY BATTERY INCLUDING THE POSITIVE ELECTRODE ACTIVE MATERIAL

A nickel-hydrogen secondary battery (2) includes an electrode group (22) comprising a separator (28), a positive electrode (24), and a negative electrode (26), and the positive electrode (24) contains a positive electrode active material (36) including a base particle (38) comprising a nickel hydroxide particle solid-dissolving Mn therein and a conductive layer (40) comprising a Co compound and covering the surface of the base particle (38), and the nickel-hydrogen secondary battery (2) is characterized in that the X-ray absorption edge energy of Mn detected within 6500 to 6600 eV in measurement with an XAFS method is 6548 eV or higher.