Patent Number: 6,309,779

Title: Hydrogen storage alloy electrode and method for manufacturing the same

Abstract: A hydrogen storage alloy electrode having a high capacity and excellent cycle characteristics is provided. The electrode is 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, and said particulate active material having a Ti--Ni system alloy phase in the surface portion thereof.

Inventors: Tsuji; Yoichiro (Katano, JP), Yamamoto; Osamu (Hirakata, JP), Toyoguchi; Yoshinori (Yao, JP), Matsuda; Hiromu (Kawabe-gun, JP)

Assignee: Matsushita Electric Industrial Co., Ltd.

International Classification: H01M 4/26 (20060101); H01M 4/38 (20060101); H01M 004/38 ()

Expiration Date: 10/30/2018