Abstract: Subjects for the invention are to provide a nickel electrode material having a satisfactory tap density and capable of attaining a sufficient reduction in discharge reserve and a process for producing the nickel electrode material, and to provide a nickel electrode and an alkaline storage battery having a high capacity and excellent internal-pressure characteristics.

Abstract: A subject for the invention is to provide a sealed nickel-hydrogen cell which has an increased capacity attained by reducing the initial generation of a negative-electrode discharge reserve and which has excellent discharge performance, e.g., high-rate discharge performance, and has high productivity.

Abstract: This invention relates to a hydrogen absorbing electrode, in which a rare earth element having a basicity weaker than that of La is mixed to a hydrogen absorbing alloy or contained in it for serving as a component element. The invention relates to a nickel electrode, in which a rare earth element is mixed to a nickel hydroxide or contained in it as a solid solution. The invention further relates to an alkaline storage battery, in which a rare earth element is coated on a surface of a nickel electrode or a surface of a separator.

Abstract: A hydrogen absorbing electrode using a hydrogen absorbing alloy including at least one or more kinds of transition metals belonging to VIIb-group, VIII-group or Ib-group in periodic table at a specified percentage, characterized in that a surface part of the hydrogen absorbing alloy forms a rich layer including the foregoing transition metals at a percentage larger than the foregoing specified percentage. Since the rich layer exists, an activation at initial stage of charge/discharge is not required. Accordingly, this electrode can be utilized effectively for a nickel-hydride secondary battery.