Hydrogen storage alloy

• US 20020179196A1
• Filed: 06/14/2002
• Published: 12/05/2002
• Est. Priority Date: 12/17/1999
• Status: Abandoned Application

• Current Assignee: Tohoku Techno Arch Co., Ltd.
• Original Assignee: Tohoku Techno Arch Co., Ltd.
• Inventors: Chou, Tsutomu, Okada, Masuo, Yamashita, Shinichi, Kuriiwa, Takahiro
• Application Number:
  US10/149,818
• Publication Number:
  US 20020179196A1
• Time in Patent Office: Days
• US Class Current: 148/421
• CPC Class Codes: C01B 3/0031 Intermetallic compounds; Metal alloys; Treatment thereof
• CPC Class Codes: C01B 3/0052 also containing titanium
• CPC Class Codes: C22C 1/02 by melting C22C1/1036 takes precedence
• CPC Class Codes: C22C 14/00 Alloys based on titanium
• CPC Class Codes: C22C 27/06 Alloys based on chromium
• CPC Class Codes: C22C 30/00 Alloys containing less than 50% by weight of each constituent
• CPC Class Codes: C22F 1/16 of other metals or alloys based thereon
• CPC Class Codes: H01M 4/383 Hydrogen absorbing alloys
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02E 60/32 Hydrogen storage

Abstract

A hydrogen storage alloy having a body-centered cubic structure phase capable of storing and releasing hydrogen as its main phase, and a composition of the general composition formula: Ti_{(100-a-0 4b)}Cr_(a-0.6b)V_(b-c)M_c, wherein 20≦a (at %)≦80, 0≦b (at %)≦10, and 0≦c (at %)<5; and M is at least one element of Mo and W.

Claims

1. A hydrogen storage alloy having the following characteristics:

(1) it has as its main phase a body-centered cubic structure phase capable of absorbing, storing and releasing hydrogen, and

(2) it has a composition of the following general composition formula;

Ti_{(100-a-0 4b)}Cr_{(a-0 6b)}V_(b-c)M_c

wherein 20≦

a (at %)≦

80, 0≦

b (at %)≦

10, and 0≦

c (at %)<

5, and m is at least one element selected from molybdenum (Mo) and tungsten (W);

2. The hydrogen storage alloy according to claim 1 which contains an element X having an atomic radius larger than Cr and smaller than Ti at a range of 0≦

d (at %)≦

20, provided that d is an atom % concentration (at %) of X.

3. The hydrogen storage alloy according to claim 1 or 2 which contains at least one or more elements (T) selected from Nb, Ta, Mn, Fe, Al, B, C, Co, Cu, Ga, Ge, Ln (various lanthanoid metals), N, Ni, P and Si at a range of 0≦

e (at %)≦

10, provided that e is an atom % concentration (at %) of T.