NOVELTY - An alkaline storage battery (10) has hydrogen storage alloy electrode (12) and nickel positive electrode (11) containing nickel hydroxide. Both the negative electrode and nickel positive electrode contain aluminum. In a state where a prescribed charging and discharging cycle has completed, aluminum content in nickel positive electrode is 0.25 %mass or more of that in positive electrode active material, and in powder X-ray diffraction of positive electrode active material, half-width of plane (101) peak for nickel hydroxide is controlled to 0.5 ( degrees /2( theta )) or more.    USE - Alkaline storage battery e.g. nickel-hydrogen storage battery is used as power supply for mobile telephone, personal computer, electric tool and hybrid vehicle.    ADVANTAGE - The alkaline storage battery has high capacity even after repeated pulse charging and discharging cycles with large current.    DETAILED DESCRIPTION - An alkaline storage battery has negative electrode containing hydrogen storage alloy as negative electrode active material, and nickel positive electrode essentially containing nickel hydroxide as positive electrode active material. The alkaline storage battery is accommodated in a battery container, and sealed with an alkali electrolyte solution. Both the negative electrode and nickel positive electrode contain aluminum. In a state where a prescribed charging and discharging cycle has completed, the aluminum content in the nickel positive electrode is 0.25 %mass or more of that in the positive electrode active material, and in powder X-ray diffraction of positive electrode active material using copper-K( alpha ), half-width of plane (101) peak for nickel hydroxide is controlled to 0.5 ( degrees /2( theta )) or more.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of nickel-hydrogen storage battery.    Alkaline storage battery (10)    Nickel positive electrode (11)    Hydrogen storage alloy electrode (12)    Separator (13)    Negative electrode collector (14)