The hydrogen storage alloy, the hydrogen storage alloy electrode using a nickel-hydrogen battery

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PROBLEM TO BE SOLVED : To provide a rare earth-Mg-Ni-based hydrogen storage alloy containing inexpensive La as a main component and hardly causing pulverization by charge/discharge and a hydrogen storage alloy electrode using this alloy and hereby to provide a high-capacity nickel-hydrogen secondary battery excellent in cycle characteristics using the rare earth-Mg-Ni-based hydrogen storage alloy at a low cost. SOLUTION : The nickel-hydrogen secondary battery contains particles of a hydrogen storage alloy in a negative pole, and this hydrogen storage alloy has a composition represented by general formula (LaaPrbNdcAd)1-xMgxNiyTz(wherein, A represents at least one element selected from the group consisting of Sm, Eu, etc.; T represents at least one element selected from the group consisting of V, Nb, etc.; subscripts a, b, c and d satisfy relations represented by a≥0.4, b>0, c≥0, d≥0, a≥b>c and a+b+c+d=1, respectively; and subscripts x, y and z are within the ranges represented by 0.10≤x≤0.25, 0.05≤z≤0.35 and 3.0≤y+z≤4.0, respectively). COPYRIGHT : (C)2008, JPO&INPIT