Positive electrode active material for alkaline storage battery, positive electrode using the same and method of producing the same

A method of producing a positive electrode for an alkaline storage battery comprising the steps of:

• (a) preparing a paste containing a positive electrode active material;
• and (b) adding said paste to a metal substrate serving as a current collector and then rolling said substrate with said paste to form an electrode plate,
• (1) said positive electrode active material comprising at least one selected from the group consisting of a nickel hydroxide powder and a nickel oxyhydroxide powder,
• (2) said positive electrode active material having a mean particle circularity from not smaller than 0.95 to not larger than 1,
• (3) said positive electrode active material having a mean particle size from not smaller than 5 μm to not larger than 20 μm on a volume basis,
• (4) said positive electrode active material having a specific surface area from not smaller than 5 m2/g to not larger than 20 m2/g, and
• (5) at least said nickel hydroxide powder having an X-ray diffraction pattern where a full width at half maximum of a peak attributed to (101) face is from not less than 0.7 deg/2θ to not more than 1.2 deg/θ and a ratio of a peak intensity of a peak attributed to (001) face to a peak intensity of a peak attributed to (101) face is not less than 1.1.