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Title:
HYDROGEN-ABSORBING ALLOY POWDER, NEGATIVE ELECTRODE, AND NICKEL HYDROGEN SECONDARY BATTERY
Document Type and Number:
WIPO Patent Application WO/2012/081724
Kind Code:
A1
Abstract:
Provided are: a hydrogen-absorbing alloy powder, whereby it becomes possible to achieve all of excellent initial activity, excellent discharge capacity and excellent cycle properties which have a trade-off relationship with one another in a nickel hydrogen secondary battery; a negative electrode for nickel hydrogen secondary batteries, which is produced using the hydrogen-absorbing alloy powder; and a nickel hydrogen secondary battery. The hydrogen-absorbing alloy has a specific chemical composition represented by formula (1): R1-aMgaNibAlcMd, and has an Mg-rich Ni-poor region on the outermost surface thereof and an Mg-Ni-containing region in the inside thereof, wherein the Mg-rich Ni-poor region contains Mg at a larger molar ratio than the molar ratio of Mg in formula (1) and contains Ni at a smaller molar ratio than the molar ratio of Ni in formula (1), and wherein the Mg-Ni-containing region contains Mg in a smaller molar ratio than the molar ratio of Mg in the Mg-rich Ni-poor region and contains Ni at a larger molar ratio than the molar ratio of Ni in the Mg-rich Ni-poor region.

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Inventors:
OTSUKI TAKAYUKI (JP)
OTA AKIYASU (JP)
IRIE TOSHIO (JP)
YANAGI YASUNORI (JP)
Application Number:
PCT/JP2011/079385
Publication Date:
June 21, 2012
Filing Date:
December 19, 2011
Export Citation:
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Assignee:
SANTOKU CORP (JP)
OTSUKI TAKAYUKI (JP)
OTA AKIYASU (JP)
IRIE TOSHIO (JP)
YANAGI YASUNORI (JP)
International Classes:
C22C19/00; C22F1/10; H01M4/38; B22F1/00; C22F1/00
Foreign References:
JP2002069554A2002-03-08
JP2005108816A2005-04-21
JP2007063597A2007-03-15
JP2009064698A2009-03-26
JP2007063597A2007-03-15
JP2009064698A2009-03-26
Other References:
See also references of EP 2653576A4
Attorney, Agent or Firm:
SAKAI Hajime et al. (JP)
Sakai 1 (JP)
Download PDF:
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Claims:



 
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