Patent ID: 6309779
Filing Date: 2001-10-30
Classification: C01B,H01M,Y02E,Y10S

Abstract:
A hydrogen storage alloy electrode made from particulate active material comprising a hydrogen storage alloy of body-centered cubic crystal structure or body-centered tetragonal crystal structure,said hydrogen storage alloy being represented by the general formula Ti.sub.a M.sup.1.sub.b Cr.sub.c M.sup.2.sub.d L.sub.e,wherein M.sup.1 is at least one element selected from the group consisting of Nb and Mo; M.sup.2 is at least one element selected from the group consisting of Mn, Fe, Co, Cu, V, Zn, Zr, Ag, Hf, Ta, W, Al, Si, C, N, P and B; L is at least one element selected from the group consisting of rare-earth elements and Y; 0.2.ltoreq.a.ltoreq.0.7; 0.01.ltoreq.b.ltoreq.0.4; 0.1.ltoreq.c.ltoreq.0.7; 0.ltoreq.d.ltoreq.0.3; 0.ltoreq.e.ltoreq.0.03; and a+b+c+d+e=1.0, andsaid particulate active material having a Ti--Ni system alloy phase in the surface portion thereof.