Title:
HYDROGEN ABSORPTION ALLOY POWDER, NEGATIVE ELECTRODE, AND NICKEL-HYDROGEN SECONDARY CELL
Document Type and Number:
WIPO Patent Application WO/2013/118806
Kind Code:
A1
Abstract:
Provided are a hydrogen absorption alloy powder, a negative electrode, and a nickel-hydrogen secondary cell, capable of simultaneously possessing excellent initial activity and cycle properties as well as low temperature properties, which are trade-offs in a nickel-hydrogen secondary cell. The alloy powder is characterized in having a composition expressed by the formula R1-aMgaNibAlcMd (where R includes rare earth elements and similar, including Sc and Y; 0.005≤a≤0.40; 3.00≤b≤4.50; 0≤c≤0.50; 0≤d≤1.00; and 3.00≤b+c+d≤4.50), the arithmetic average roughness (Ra) of the outer surface of the powder being at least 2 µm and the crushing strength of the powder being no more than 35,000 gf/mm2.
Inventors:
OTSUKI TAKAYUKI (JP)
OTA AKIYASU (JP)
YANAGI YASUNORI (JP)
OTA AKIYASU (JP)
YANAGI YASUNORI (JP)
Application Number:
PCT/JP2013/052826
Publication Date:
August 15, 2013
Filing Date:
February 07, 2013
Export Citation:
Assignee:
SANTOKU CORP (JP)
International Classes:
C22C19/00; B22F1/00; B22F5/00; H01M4/38
Foreign References:
| JP2008210554A | 2008-09-11 | |||
| JPH03116655A | 1991-05-17 | |||
| JPH07296810A | 1995-11-10 | |||
| JP2004273261A | 2004-09-30 | |||
| JPH053031A | 1993-01-08 | |||
| JP2008210556A | 2008-09-11 | |||
| JP2011127185A | 2011-06-30 | |||
| JPH11323469A | 1999-11-26 | |||
| JPH05225975A | 1993-09-03 | |||
| JP2000228191A | 2000-08-15 | |||
| JP2004263213A | 2004-09-24 |
Other References:
See also references of EP 2813588A4
Attorney, Agent or Firm:
SAKAI Hajime et al. (JP)
Sakai 1 (JP)
Sakai 1 (JP)
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Claims:
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