Alkaline storage battery using hydrogen absorbing alloy

Claim 1

An alkaline storage battery using a hydrogen absorbing alloy, said battery comprising: a positive electrode including a metal oxide as a main constituent material; a negative electrode including, as a main constituent material, a hydrogen absorbing alloy capable of electrochemically absorbing/desorbing hydrogen serving as an active material; an alkaline electrolytic solution; a separator; and said hydrogen absorbing alloy of said negative electrode having a CaCu 5 type crystal structure and being represented by the general formula of A 1-x B x C y D z , in which formula: A is selected from the group consisting of La, mixtures of rare-earth elements, and misch metal; B is selected from the group consisting of Ti, Zr, Ca, Y, Hf and mixtures thereof; x is an atomic ratio within the range 0≦x≦0.2; C is selected from the group consisting of Ni, Co, Mn, Al, Fe, Cu, Cr and mixtures thereof; y has an atomic ratio within the range made up as follows, y>3.5 for Ni, y ≦1.0 for Co, y≦0.6 for Mn, y≦0.5 for Al, y≦0.3 for Fe, y≦1.0 for Cu, and y≦0.3 for Cr; D is selected from the group consisting of V, In, Tl, Ga and mixtures thereof; z is an atomic ratio within the range made up as follows, 0.02≦z≦0.3 for V, 0.02≦z≦0.1 for In, 0.02≦z≦0.1 for Tl, and 0.02≦z≦0.1 for Ga; and (y+z) is an atomic ratio within the range of from 4.7 to 6.3.