POSITIVE PLATE FOR ALKALINE STORAGE BATTERY

摘要

PROBLEM TO BE SOLVED: To prevent the reduction of an open circuit voltage in a battery caused by its shelf state for a long period of time by a method where in the surface of a Ni porous member having a passive state oxide film is provided with a specified Co/Ni mixed compound and active substance is held on it. SOLUTION: A passive state oxide film is applied to a Ni porous member acting as a supporting member. In addition, a Co/Ni mixed compound with a mole ratio of 20:80 to 97:3 of Co and Ni is formed on the surface of the film. After this state, active substance having as its major element nickel hydroxide is held to make a positive plate. The alkaline storage battery having the positive plate with such a configuration as above has a feature that a reduction of an open-circuited voltage and also a reduction in an irreversible electrical discharging capacity are low even if the battery is left for a long period of time. In the case that the mixed compound in respect to the active substance is converted into hydroxide, an effect of improvement in reduction in performance in the shelf state of long period of time is remarkably increased when 1 to 15wt.% is contained.