Patent ID: 8257862

Claim:
An alkaline storage battery, comprising: a negative electrode that has, as a negative electrode active material, a hydrogen storage alloy that is represented by the general formula Ln 1-x Mg x (Ni 1-y T y ) z (wherein Ln represents at least one element selected from the group comprising a lanthanoid element, Ca, Sr, Sc, Y, Ti, Zr, and Hf; T represents at least one element selected from the group comprising V, Nb, Ta, Cr, Mo, Mn, Fe, Co, Al, Ga, Zn, Sn, In, Cu, Si, P, and B; 0<x≦0.2; 0<y≦0.5; and 3.4≦z≦4.5); a positive electrode; a separator; and an alkaline electrolyte solution, which are provided inside a package can; said alkaline storage battery characterized in that an equilibrium pressure P of said hydrogen storage alloy is 0.02 MPa≦P≦0.11 MPa, at an H/M of 0.5 and at 40° C.; wherein Ln includes at least Nd, and the percentage of Nd in Ln is 97% or greater.