US4940553A
Expired / Lapsed
US
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Aqueous nickel hydroxide paste of high flowability
Assignee: Hoppecke Batterie Systeme GmbH
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Filing: 1989-05-26
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Granted: 1990-07-10
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Expires: 2009-05-26
Abstract
Abstract An aqueous nickel-hydroxide paste of high flowability for the vibration filling of foam-structure and fiber-structure electrode plaques has a content of about 30 to 50% by volume of nickel hydroxide, a maximum particle size of about 0.04 mm, a plastic viscosity of about 0.1 to 1 Pa.s and a yield value of between about 10 and 120 Pa, a pH of between about 9 and 12 and a content of about 0.5 to 5, in particular about 1 to 5, % by weight, based on the nickel hydroxide content, of a dispersant from the group comprising the water-soluble salts of polhphosphoric acids or di- and polyphosphonic acids and their derivatives. Very particularly suitable as a dispersant is 1-hydroxyethane-1, 1-diphosphonic acid in the form of its cobalt/alkali salt complex. This paste makes it possible to completely fill foam-structure and fiber-structure electrode plaques in one operation.
Inventors
- 👤 Klaus VON Benda
- 👤 Gabor Benczur-Urmossy
- 👤 Gerhard Berger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:07
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/62; H01M4/24; H01M4/26; H01M4/36; H01M4/48; H01M4/52; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
119 words
Aqueous Ni(OH) 2 paste of high flowability for the vibration filling of foam-structure and fiber-structure electrode plaques having a content of nickel hydroxide of about 30 to 50% by volume, a maximum particle size of about 0.04 mm, a plastic viscosity of about 0.1 to 1 Pa.s and a yield value of between about 10 and 120 Pa, and also a pH of between about 9 and 12, which, in addition, also contains a dispersant, wherein the dispersant is selected from one of the group consisting of water-soluble salts of derivatives of di- and polyphosphonic acids and the group consisting of water-soluble salts of polyphosphoric acid, wherein the polyphosphoric acid has about 3 to 20 phosphorus atoms per molecule.
Claim 2
Dependent Claim
119 words
Aqueous Ni(OH) 2 paste of high flowability for the vibration filling of foam-structure and fiber-structure electrode plaques having a content of nickel hydroxide of about 30 to 50% by volume, a maximum particle size of about 0.04 mm, a plastic viscosity of about 0.1 to 1 Pa.s and a yield value of between about 10 and 120 Pa, and also a pH of between about 9 and 12, which, in addition, also contains a dispersant, wherein the dispersant is selected from one of the group consisting of water-soluble salts of derivatives of di- and polyphosphonic acids and the group consisting of water-soluble salts of polyphosphoric acid, wherein the polyphosphoric acid has about 3 to 20 phosphorus atoms per molecule.
Claim 3
Dependent Claim
21 words
Aqueous Ni(OH) 2 paste according to claim 1, wherein the polyphosphoric acid has about 6 to 20 phosphorus atoms per molecule.
Claim 4
Dependent Claim
40 words
Aqueous Ni(OH) 2 paste according to claim 1, wherein a content of about 0.5 to 5% by weight, based on the nickel hydroxide content, of the dispersant selected from the group consisting of water-soluble salts of polyphosphoric acid is provided.
Claim 5
Dependent Claim
32 words
Aqueous Ni(OH) 2 paste according to claim 1, wherein the dispersant selected from the group consisting of water-soluble salts of derivatives of di- and polyphosphonic acids are alkylated or arylated phosphonic acids.
Claim 6
Dependent Claim
40 words
Aqueous Ni(OH) 2 paste according to claim 4, wherein the dispersant selected from the group consisting of water-soluble salts of derivatives of di- and polyphosphonic acids do not contain more than two C atoms per P atom in the molecule.
Claim 7
Dependent Claim
26 words
Aqueous Ni(OH) 2 paste according to claim 1, wherein the dispersant selected from the group consisting of the water-soluble salts of polyphosphoric acids are alkali salts.
Claim 8
Dependent Claim
26 words
Aqueous Ni(OH) 2 paste according to claim 1, wherein the dispersant selected from the group consisting of derivatives of di- and polyphosphonic acids are alkali salts.
Claim 9
Dependent Claim
23 words
Aqueous Ni(OH) 2 paste according to claim 1, wherein the dispersant is selected from the group of 1-hydroxyethane-1, 1-diphosphonic acid and aminotrismethylenephosphonic acid.
Claim 10
Dependent Claim
65 words
Aqueous Ni(OH) 2 paste according to claim 1, wherein the dispersant is an alkali-metal/cobalt complex of 1-hydroxyethane-1, 1-disphosphonic acid (HEDP) of the formula Co x M y H z (HEDP), in which M denotes an alkali metal and x is between about 0.5 and 1.25, y is between about 0.5 and 1.5 and z is between about 0.2 and 2, with the proviso that 2x+y+z=4.
Claim 11
Dependent Claim
31 words
Aqueous Ni(OH) 2 paste according to claim 1, further including at least one of a cobalt powder and cobalt compounds selected from the group consisting of oxides, hydroxides, borates and phosphates.
Claim 12
Dependent Claim
25 words
Aqueous Ni(OH) 2 paste according to claim 10, wherein total cobalt content in the paste is about 2 to 12 atom percent, based on nickel.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-07-09 | 1994-01-08 | 1994-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-09 | 1998-01-08 | 1998-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-09 | 2002-01-08 | 2002-07-10 | $7700.00 | Window Closed / Lapsed |