EP0557522B1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Hydrogen-storing electrode, nickel electrode, and nickel-hydrogen battery
Assignee: Yuasa Development Corp
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Filing: 1991-10-22
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Granted: 1996-02-07
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Expires: 2011-10-22
Abstract
Abstract A hydrogen-storing electrode of the present invention, configured by mixing 3 to 20 wt % of metallic cobalt powder with hydrogen absorbing alloy powder made by replacing part of Ni of an alloy shown by the rational formula 'MnNi5' with at least one of Al, Fe, Cu, Co, and Mn and filling an alkaline metallic porous body with the mixed powder. A nickel electrode of the present invention, configured by mixing 5 to 15 wt % of cobalt monoxide powder with active material powder in which 2 to 8 wt % of zinc is present in the crystal of spherical nickel hydroxide powder with the internal pore volume of 0.14ml/g or less and filling an alkali-resistant metallic porous body with the mixed powder. A nickel-hydrogen battery of the present invention, configured by winding the above hydrogen-storing electrode and the above nickel electrode at the both sides of a separator, filling the electrodes with potassium hydroxide before sealing, and leaving them as they are for 5 hr or more.
Inventors
- 👤 Hiroyuki Mori
- 👤 Keiichi Hasegawa
- 👤 Masaharu Watada
- 👤 Masahiko Oshitani
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 10:56
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/24; H01M4/242; H01M10/00; H01M10/34; H01M10/345; H01M4/32; H01M4/36; H01M4/38; H01M4/383; H01M4/48; H01M4/52; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y10; Y10S; Y10S420/00; Y10S420/90
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
109 words
A method of making a metal hydride electrode characterised in that a powder of cobalt constituent containing material is mixed with a powder of hydrogen-absorbing alloy within a mixing range of 3 to 20 wt%, the hydrogen-absorbing alloy being formed by substitution in an alloy of rational formula MmNi₅ a part of Ni with Al and at least one of Fe, Cu, Co and Mn, the mixed powders being loaded in a porous alkaline-proof metal substrate and subjected to a charge/discharge reaction so as to dissolve and precipitate a cobalt constituent and so as to form a surface layer comprising the cobalt constituent on the powder of hydrogen-absorbing alloy.
Claim 2
Dependent Claim
25 words
A method according to claim 1, in which the cobalt constituent containing material is a metal cobalt, a cobalt compound or a cobalt containing alloy.
Claim 3
Dependent Claim
15 words
A method according to claim 2, in which the cobalt compound is a cobalt monoxide.
Claim 4
Independent Claim
44 words
A method according to any preceding claim, in which the hydrogen absorbing alloy is MmNi 3.7 Al x M y N z (M:Fe or Mn, N: Cu or Co, 0.3 ≤ x ≤ 0.9; 0.1 ≤ y ≤ 0.9; 0.1 ≤ z ≤ 0.9).
Claim 5
Independent Claim
136 words
A method of making a metal hydride electrode characterised in that a powder of simple copper is mixed with a powder of hydrogen absorbing alloy within a mixing range of 5 to 10 wt% and a cobalt constituent containing material is mixed therewith within a mixing range of 3 to 10 wt%; in that the hydrogen absorbing alloy is formed by substituting a part of Ni of alloy expressed by a rational formula of MmNi₅ with Al and at least one of Fe, Cu, Co and Mn; and in that said mixed powder is loaded in a porous alkaline-proof metal substrate and subjected to a charge/discharge reaction so as to dissolve and precipitate a cobalt constituent so as to form a surface layer comprising the cobalt constituent is formed on said powder of hydrogen absorbing alloy.
Claim 6
Independent Claim
140 words
A method of making a metal hydride electrode, in which a surface of powder of hydrogen absorbing alloy is coated with simple nickel within a range of 1 to 10 wt%, the hydrogen absorbing alloy being formed by substituting a part of Ni of alloy expressed by a rational formula of MmNi₅with Al, and at least one of Fe, Cu, Co and Mn, characterised in that said powder is mixed with a powder of cobalt constituent containing material within a range of 3 to 10 wt%; and in that said mixed powder is loaded in a porous alkaline-proof metal substrate and subjected to a charge/discharge reaction so as to dissolve and precipitate a cobalt constituent, so as to form a surface layer comprising the cobalt constituent is formed on said powder of hydrogen absorbing alloy coated with the simple nickel.
Claim 7
Independent Claim
139 words
A method of making a metal hydride electrode, in which a powder of simple nickel is mixed with a powder of hydrogen absorbing alloy within a mixing range of 5 to 10 wt%, characterised in that a powder of cobalt constituent containing material is mixed therewith within a mixing range of 3 to 10 wt%, in that the hydrogen absorbing alloy is formed by substituting a part of Ni of alloy expressed by a rational formula of MmNi₅ with Al and at least one of Fe, Cu, Co and Mn; and in that said mixed powder is loaded in a porous alkaline-proof metal substrate and subjected to a charge/discharge reaction so as to dissolve and precipitate a cobalt constituent, so as to form a surface layer comprising the cobalt constituent is formed on said powder of hydrogen absorbing alloy.
Claim 8
Independent Claim
29 words
A method according to any of claims 5 to 7, in which the cobalt constituent containing material is a metal cobalt, a cobalt compound or a cobalt containing alloy.
Claim 9
Dependent Claim
16 words
A metal hydride electrode which may be manufactured by a method according to any preceding claim.
Claim 10
Independent Claim
146 words
A method of making a nickel hydride battery, in which a nickel electrode is made by mixing a powder of cobalt monoxide with a powder of active material in a mixing range of 5 to 15 wt%, the powder of active material comprising simple zinc existing within a range of 2 to 8 wt% under a solid solution state in a crystal of a powder of nickel hydroxide assuming a spherical shape and having an inner pore volume of 0.14 ml/g or less, and loading the powder into a porous alkaline-proof metal substrate; characterised by: making a metal hydride electrode by a method according to any one of claims 1 to 8; and winding the nickel electrode and the metal hydride electrode with a separator between them, filling with an aqueous solution of potassium hydroxide, and maintaining them under standing conditions for five hours or more.
Claim 11
Dependent Claim
13 words
A nickel hydride battery which may be manufactured according to any preceding claim.
References Cited (Backward Citations)
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