ALKALINE STORAGE BATTERY

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PROBLEM TO BE SOLVED : To provide an alkaline storage battery which uses a hydrogen storage alloy of a rare earth-Mg-Ni system having a stable crystal structure, and has improved cycle characteristics and electrical discharge characteristics. SOLUTION : A negative electrode (4) of the alkaline storage battery contains the hydrogen storage alloy of the rare earth-Mg-Ni system. The hydrogen storage alloy of the rare earth-Mg-Ni system has a composition expressed by general formula (AαLn1-α)1-βMgβNiγ-δ-εAlδTε, (wherein (A) represents one or more elements which are selected from the group consisting of Pr, Nd, Sm and Gd and contain at least Sm; (Ln) represents at least one element selected from the group consisting of La, Ce and the like; (T) represents at least one element selected from the group consisting of V, Nb and the like; and suffixes α, β, γ, δ and ε represent numbers which satisfy 0.4≤α, 0.05<β<0.15, 3.0≤γ≤4.2, 0.15≤δ≤0.30 and 0≤ε≤0.20, respectively). COPYRIGHT : (C)2009, JPO&INPIT