NICKEL-HYDROGEN BATTERY

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This invention provides a closed nickel-hydrogen battery that, particularly under a low-temperature atmosphere, has high output density and has excellent cycle characteristics. The nickel-hydrogen battery comprises a nickel electrode as a positive electrode and a hydrogen absorbing electrode as a negative electrode. The hydrogen absorbing electrode is a hydrogen absorbing alloy electrode comprising a hydrogen absorbing alloy powder supported on an electrically conductive support. The hydrogen absorbing alloy powder comprises a rare earth element and a nickel-containing non-rare earth metal element. The hydrogen absorbing alloy powder has a mass saturation magnetization of 2 to 6 emu/g, and the amount of the hydrogen absorbing alloy powder supported per unit area of the hydrogen absorbing electrode is 0.06 to 0.15 g/cm2.