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Title:
POSITIVE ELECTRODE ACTIVE MATERIAL FOR ALKALINE STORAGE BATTERY, MANUFACTURING METHOD FOR POSITIVE ELECTRODE ACTIVE MATERIAL, AND ALKALINE STORAGE BATTERY
Document Type and Number:
WIPO Patent Application WO/2012/096294
Kind Code:
A1
Abstract:
[Problem] To provide an alkaline storage battery exhibiting large discharge capacity and little performance degradation during over-discharge. [Solution] A positive electrode active material for an alkaline storage battery has: a core layer containing nickel hydroxide; and a conductive auxiliary layer coating the surface of the core layer. The positive electrode active material is characterized by the conductive auxiliary layer containing a cobalt oxyhydroxide phase and a cerium dioxide phase, and by the active material containing lithium. The inclusion of the cerium dioxide phase in the conductive auxiliary layer enables the inhibition of the reduction of the cobalt oxyhydroxide phase, even in conditions such as over-discharge. The inclusion of lithium in the active material and the inclusion of cerium dioxide in the conductive auxiliary layer enable the increase of the battery discharge capacity.

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Inventors:
KAKEYA TADASHI (JP)
KANEMOTO MANABU (JP)
KODAMA MITSUHIRO (JP)
Application Number:
PCT/JP2012/050351
Publication Date:
July 19, 2012
Filing Date:
January 11, 2012
Export Citation:
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Assignee:
GS YUASA INT LTD (JP)
KAKEYA TADASHI (JP)
KANEMOTO MANABU (JP)
KODAMA MITSUHIRO (JP)
International Classes:
H01M4/52; C01F17/235; H01M10/30
Domestic Patent References:
WO2006064979A12006-06-22
Foreign References:
JPH10261412A1998-09-29
JPH11147719A1999-06-02
JP2004247288A2004-09-02
JP2007059071A2007-03-08
JPH117949A1999-01-12
JPH117950A1999-01-12
JPH1050308A1998-02-20
JPH10261412A1998-09-29
JP2000223119A2000-08-11
JPH11147719A1999-06-02
Other References:
See also references of EP 2665113A4
Attorney, Agent or Firm:
MORIWAKI, Masashi et al. (JP)
Masashi Moriwaki (JP)
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