| 摘要 |
Disclosed is an alkaline storage battery comprising a negative electrode, a positive electrode, a separator and an alkaline electrolyte solution in a package can. The negative electrode contains a hydrogen storage alloy represented by the following general formula: Ln1-xMgx(Ni1-yTy)z (wherein Ln represents at least one element selected from lanthanoid elements, Ca, Sr, Sc, Y, Ti, Zr and Hf; T represents at least one element selected from V, Nb, Ta, Cr, Mo, Mn, Fe, Co, Al, Ga, Zn, Sn, In, Cu, Si, P and B; and 0<x≦̸1, 0≦̸y≦̸0.5 and 2.5≦̸z≦̸4.5) as a negative electrode active material. In this alkaline storage battery, the hydrogen equilibrium pressure (P) is regulated to satisfy 0.02 MPa≦̸P≦̸0.11 MPa when the hydrogen amount stored in the hydrogen storage alloy (H/M (atomic ratio)) at 40° C. is 0.5.
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