Patent ID: 7198868
Filing Date: 2007-04-03
Classification: H01M,Y02E

Abstract:
1. An alkaline storage battery comprising a negative electrode, a positive electrode comprising nickel hydroxide as a positive electrode active material, and an alkaline electrolyte, wherein the negative electrode comprises (a) a hydrogen absorbing alloy represented by Ln 1-x Mg x Ni y-a M a (where Ln is at least one element selected from rare earth elements, M is at least one element selected from the group consisting of Al, V, Nb, Ta, Cr, Mo, Mn, Fe, Co, Ga, Zn, Sn, In, Cu, Si and P, 0.05≦x<0.20, 2.8≦y≦3.9 and 0.10≦a≦0.50) and (b) carbon as a conductive agent, and hydrogen content in the hydrogen absorbing alloy is not greater than 0.01 weight % when the battery is activated and is discharged to 1.0 V at one hour rate (It).