The hydrogen storage alloy and a nickel hydrogen battery

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Disclosed is a hydrogen storage alloy included in a negative electrode of a nickel-hydrogen storage battery. Specifically disclosed is a hydrogen storage alloy that simultaneously satisfies the conditions of superior energy density for the battery because of a comparatively high specific gravity for the hydrogen storage alloy and comparatively high discharge capacity for the nickel-hydrogen storage battery. Also disclosed is a nickel-hydrogen storage battery provided with a hydrogen storage alloy and negative electrode containing that hydrogen storage alloy wherein the chemical composition is represented by general formula (1). R1v Mgw Cax R2y (1). R1 is one or more elements selected from the rare earth elements. R2 is Ni or a hydrogen storage alloy wherein some Ni is substituted by one or more elements selected from a group composed of Al, Co, Cu, Mn, Fe, Cr and Zn. When v, w, x and y are set so as to satisfy formula (2), v, w, x and y for the disclosed hydrogen storage alloy and electrode containing that hydrogen storage alloy satisfy formula (3), formula (4) and formula (5). v+w+x+y=100 (2), 2.0=x=5.0 (4), 0.8=w/x=2.5 (5)