To electrolydeposited manganese dioxide of which pH being adjusted to a range higher than 2 with either a sodium compound or a potassium compound, a raw lithium material and a compound containing any element selected from a group consisting of aluminum, magnesium, calcium, titanium, vanadium, chromium, iron, cobalt, nickel, copper and zinc to substitute a part of the manganese contained in the electrodeposited manganese dioxide with at least one element selected from the group described above, admixed and then burned.