The hydrogen storage alloy powder and nickel hydrogen battery using the same.

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PROBLEM TO BE SOLVED : To provide a hydrogen storage alloy electrode of which the discharge capacity is not deteriorated, and also, which has excellent charging-discharging cycle performance and charging receiving performance upon rapid charging, and to provide a nickel-hydrogen storage battery. SOLUTION : As the active substance of a hydrogen storage alloy electrode, hydrogen storage alloy powder 1 has a CaCu5 type crystal structure and is composed of MmMgNiCoMnAl (Mm denotes misch metal), wherein a fine segregated phase comprising an MgNiCoMnAl alloy phase is present in a dispersed condition at least inside the hydrogen storage alloy powder, is applied. Further, hydrogen storage alloy powder provided with a surface layer 3 made of an alloy of Ni and Co on the surface of the hydrogen storage alloy powder is preferably applied. COPYRIGHT : (C)2011, JPO&INPIT