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Title:
HYDROGEN-STORAGE ALLOY PARTICLES, ALLOY POWDER FOR ELECTRODE, AND ALKALINE STORAGE BATTERY
Document Type and Number:
WIPO Patent Application WO/2012/073418
Kind Code:
A1
Abstract:
The present invention relates to: hydrogen-storage alloy particles which each comprises a matrix phase (2) and a plurality of segregation phases (3), the matrix phase being an alloy of the CaCu5-type crystal structure; an alloy powder for electrodes; and an alkaline storage battery. Alkaline storage batteries in which hydrogen-storage alloy particles each containing the alloy as the matrix phase are employed as a negative active material can be used as a power supply to electric vehicles, etc. However, attempts to improve the cycle characteristics and discharge characteristics of the batteries while keeping the Co content of the alloy low have posed problems, for example, that the low-temperature discharge characteristics remain unimproved. The invention has solved the problems with the hydrogen-storage alloy particles in which the matrix phase (2) is constituted of an alloy of the CaCu5-type crystal structure containing Ni and 1-5 mass% Co and which contains a plurality of segregation phases (3) that are constituted of a magnetic material comprising Ni as the main component and that have an average grain diameter of 1-5 nm.

Inventors:
NAKATSUJI KYOKO
KIKUYAMA SUSUMU
KATSUMOTO MASUMI
DANSUI YOSHITAKA
Application Number:
PCT/JP2011/005387
Publication Date:
June 07, 2012
Filing Date:
September 26, 2011
Export Citation:
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Assignee:
PANASONIC CORP (JP)
NAKATSUJI KYOKO
KIKUYAMA SUSUMU
KATSUMOTO MASUMI
DANSUI YOSHITAKA
International Classes:
H01M4/38; B22F1/00; C22C19/00
Foreign References:
JP2010018866A2010-01-28
JP2002080925A2002-03-22
JPH07326354A1995-12-12
JPH1125964A1999-01-29
JP2001040442A2001-02-13
Attorney, Agent or Firm:
ISHII, Kazuo et al. (JP)
Kazuo Ishii (JP)
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Claims: