Hydrogen storage alloy and electrode therefrom

Details Hydrogen storage alloy and electrode therefrom Hydrogen storage alloy and electrode therefrom

1996-04-17

1998-05-19

Sheehan, John

Metal treatment

Stock

Containing over 50 per cent metal, but no base metal

148421, 420900, 420421, 420422, 429218, C22C 3000

Patent

active

057530548

ABSTRACT:
Addition of Mo to a Zr--Mn--V--Cr--Co--Ni, a Zr--Mn--Cr--Co--Ni hydrogen storage alloy, or those including Ti as substitution for Zr improves high-rate discharge characteristics of the hydrogen storage alloy at low temperatures. The hydrogen storage alloy is of the general formula ZrMn.sub.a V.sub.b Mo.sub.c Cr.sub.d Co.sub.e Ni.sub.f, wherein 0.4.ltoreq.a.ltoreq.0.8, 0.ltoreq.b<0.3, 0<c.ltoreq.0.3, 0<d.ltoreq.0.3, 0<e.ltoreq.0.1, 1.0.ltoreq.f.ltoreq.1.5, 0.1.ltoreq.b+c.ltoreq.0.3, and 2.0.ltoreq.a+b+c+d+e+f.ltoreq.2.4, or Zr.sub.1-x Ti.sub.x Mn.sub.a V.sub.b Mo.sub.c Cr.sub.d Co.sub.e Ni.sub.f, wherein 0<x.ltoreq.0.5, 0.4.ltoreq.a.ltoreq.0.8, 0.ltoreq.b<0.3, 0<c.ltoreq.0.3, 0<d.ltoreq.0.3, 0<e.ltoreq.0.1, 1.0.ltoreq.f.ltoreq.1.5, 0.1.ltoreq.b+c.ltoreq.0.3, x.ltoreq.b+c+d+e, and 1.7.ltoreq.a+b+c+d+e+f.ltoreq.2.2 or Zr.sub.1- Ti.sub.x Mn.sub.a Mo.sub.c M.sub.y Cr.sub.d Ni.sub.f, wherein M is at least one selected from the group consisting of Fe, Cu, and Zn, and wherein 0<x.ltoreq.0.5, 0.4.ltoreq.a.ltoreq.0.8, 0<c.ltoreq.0.3, 0.ltoreq.y.ltoreq.0.2, 0<d.ltoreq.0.3, 1.0.ltoreq.f.ltoreq.1.5, and 1.7.ltoreq.(a+c+y+d+f).ltoreq.2.2. The alloy has a C15(MgCu.sub.2)-type Laves phase as a main alloy phase.

REFERENCES:
patent: 4814002 (1989-03-01), Grasselli et al.
patent: 5238758 (1993-08-01), Fetcenke et al.
patent: 5330861 (1994-07-01), Fetcenko et al.
patent: 5441715 (1995-08-01), Gamo et al.
patent: 5541017 (1996-07-01), Hong et al.
patent: 5575831 (1996-11-01), Yamamura et al.

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