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US4810600A
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Cathode coating dispersion for batteries
Assignee: Imerys Graphite and Carbon Switzerland SA
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Filing: 1988-01-14
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Granted: 1989-03-07
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Expires: 2008-01-14
Abstract
Abstract A cathode coating dispersion containing graphite and/or carbon black, which is suitable for battery production, especially for a water-resistant and alkali-resistant and yet electrically conductive coating of the cathode surfaces. The protective film is applied as a homogeneous aqueous dispersion and contains a binder which is a copolymer of (a) vinyl acetate and ethylene, (b) vinyl acetate and vinyl chloride, (c) styrene and butadiene or (d) vinyl acetate, vinyl chloride and ethylene.
Inventors
- 👤 Jacques Periard
- 👤 Mathis Wissler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:31
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/64; H01M4/66; H01M4/663; H01M50/00; H01M50/10; H01M50/116; H01M50/124; H01M50/1243; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
97 words
Cathode coating dispersion containing graphite, carbon black or a mixture thereof, for the production of a battery with improved storage and discharge properties, which forms an electrically conductive protective film on the cathode holder, characterized in that the protective film is applied as a homogeneous aqueous dispersion and contains a binder which is a copolymer of (a) vinyl acetate and ethylene, (b) vinyl acetate and vinyl chloride, (c) styrene and butadiene or (d) vinyl acetate, vinyl chloride and ethylene, the ratio of the graphite, carbon black or mixture thereof to the binder being between 4:1 and 1:2.
Claim 2
Dependent Claim
97 words
Cathode coating dispersion containing graphite, carbon black or a mixture thereof, for the production of a battery with improved storage and discharge properties, which forms an electrically conductive protective film on the cathode holder, characterized in that the protective film is applied as a homogeneous aqueous dispersion and contains a binder which is a copolymer of (a) vinyl acetate and ethylene, (b) vinyl acetate and vinyl chloride, (c) styrene and butadiene or (d) vinyl acetate, vinyl chloride and ethylene, the ratio of the graphite, carbon black or mixture thereof to the binder being between 4:1 and 1:2.
Claim 3
Dependent Claim
21 words
Cathode coating dispersion according to claim 1 wherein the dispersion has a water content between 40 and 95 percent by weight.
Claim 4
Dependent Claim
26 words
Cathode coating dispersion according to claims 1 or 2 wherein the ratio of graphite, carbon black or mixture thereof to binder is between 3:1 and 1:1.
Claim 5
Dependent Claim
26 words
Cathode coating dispersion according to claim 3 wherein the graphite, carbon black or mixture thereof content of the dry mass is between 40 and 85 percent.
Claim 6
Dependent Claim
34 words
Cathode coating dispersion according to claim 4 wherein the dispersion additionally contains a surfactant or several surfactants in an amount of 0.5 to 5 percent by weight of the dry mass of the dispersion.
Claim 7
Dependent Claim
15 words
Cathode coating dispersion according claim 5 wherein the dispersion shows a pseudoplastic and thixotropic behavior.
Claim 8
Dependent Claim
21 words
Cathode coating dispersion according claim 6 wherein the dispersion has a viscosity of 0.05 to 1.2 Pa.s measured at 20° C.
Claim 9
Dependent Claim
22 words
Cathode coating dispersion according to claim 1 wherein the copolymer of styrene and butadiene is carboxylated by incorporation of an unsaturated carboxylic.
Claim 10
Dependent Claim
23 words
Cathode coating dispersion according to claim 8 wherein a carboxylated styrene-butadiene copolymer with a styrene portion of more than 50 percent is used.
Claim 11
Dependent Claim
15 words
Cathode coating dispersion according to claim 8 wherein the unsatured carboxylic acid is acrylic acid.
Claim 12
Dependent Claim
24 words
Cathode coating dispersion according to claim 1 wherein the graphite or carbon black content of the dry mass is between 40 and 85 percent.
Claim 13
Dependent Claim
33 words
Cathode coating dispersion according to claim 1 wherein the dispersion additionally contains at least one surfactant in an amount of 0.5 to 5 percent by weight of the dry mass of the dispersion.
Claim 14
Dependent Claim
16 words
Cathode coating dispersion according to claim 1 wherein the dispersion shows a pseudoplastic and thixotropic behavior.
Claim 15
Dependent Claim
22 words
Cathode coating dispersion according to claim 1 wherein the dispersion has a viscosity of 0.05 to 1.2 Pa.s measured at 20° C.
Claim 16
Dependent Claim
24 words
A battery containing an electrically conductive protective film which is 5 to 200 microns thick, deposited from the cathode coating dispersion of claim 1.
Claim 17
Dependent Claim
31 words
A battery, wherein the cathode surfaces of the battery contain an electrically conductive protective film, which is 5 to 200 microns thick, deposited from the cathode coating dispersion of claim 1.
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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) | 1992-03-06 | 1992-09-05 | 1993-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-06 | 1996-09-05 | 1997-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-06 | 2000-09-05 | 2001-03-07 | $7700.00 | Window Closed / Lapsed |