US 2010/0167122 A1 · ALKALINE STORAGE BATTERY

Abstract

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.

Claims5

Dependent claims

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 Ln1-xMgx(Ni1-yTy)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≦1;
0≦y≦0.5;
and 2.5≦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.

8 more elements

Dependencies are inferred from the claim text.

Alkaline storage battery

Life of this patent

Alkaline storage battery

Life of this patent

Abstract

Claims5