Patent ID: 6703164
Filing Date: 2004-03-09
Classification: H01M,Y02E,Y10S

Abstract:
A hydrogen-absorbing alloy comprising at least one kind of phase selected from the group consisting of a first phase having a hexagonal crystal system (excluding a phase having a CaCu5 type crystal structure) and a second phase having a rhombohedral crystal system, an areal ratio of said at least one kind of phase of said hydrogen-absorbing alloy being 50% or more, and said hydrogen-absorbing alloy having a composition represented by the following general formula (4):R1-aMgaNiZ-X-YAlXCoYM4&agr;â€ƒâ€ƒ(4) wherein R is at least one kind of element selected from rare earth elements (which include Y) with a proviso that the content of Ce in said R is less than 20% by weight (including 0% by weight); M4 is at least one element selected from the group consisting of Mn, Fe, Ga, Zn, Sn, Cu, Si, B, Nb, W, Ti, Zr, In, Mo, V, Cr, P and S; and the atomic ratios of a, X, Y, Z and &agr; are respectively a number satisfying the conditions of: 0.15&lE;a&lE;0.33, 0.06&lE;X&lE;0.15, 0&lE;Y&lE;0.2, 3.15