US5053375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrochemical cathode and materials therefor
Assignee: Yardney Technical Products Inc
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Filing: 1990-01-08
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Granted: 1991-10-01
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Expires: 2010-01-08
Abstract
Abstract There is disclosed a process for producing an electrochemical cathode for an electrochemical cell comprised of a current collecting layer or substrate laminated to a layer of a nonwoven conductive fibrous web, preferably of conductive carbon fibers, impregnated with a mixture of silver-containing carbon particles and a nonfibrous polymeric substance, and optionally with a hydrophobic microporous film or layer disposed on one of the layers of the nonwoven conductive fibrous web, as well as the product produced thereby.
Inventors
- 👤 Bhaskara M. L. Rao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:54
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/86; H01M4/88; H01M4/8803; H01M4/8807; H01M4/8825; H01M4/8842; H01M4/8878; H01M4/8882; H01M4/8896; H01M4/96; H01M2004/8678; H01M2004/8689; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
107 words
A process for forming an electrochemical cathode, which comprises: a) admixing a slurry of carbon particles with a solution of silver salt to form a slurry of silver salt and carbon particles; b) thereafter effecting adsorption of Ag° onto said carbon particles in said slurry of step a) prior to step c) to thereby form a slurry of Ag°-adsorbed carbon particles; c) impregnating a conductive nonwoven fibrous web with a dispersion comprised of said Ag°-adsorbed carbon particles and a nonfibrous polymeric material for holding said Ag°-adsorbed carbon particles to said web; and d) laminating a current collecting substrate to said impregnated web to form said electrochemical cathode.
Claim 2
Dependent Claim
107 words
A process for forming an electrochemical cathode, which comprises: a) admixing a slurry of carbon particles with a solution of silver salt to form a slurry of silver salt and carbon particles; b) thereafter effecting adsorption of Ag° onto said carbon particles in said slurry of step a) prior to step c) to thereby form a slurry of Ag°-adsorbed carbon particles; c) impregnating a conductive nonwoven fibrous web with a dispersion comprised of said Ag°-adsorbed carbon particles and a nonfibrous polymeric material for holding said Ag°-adsorbed carbon particles to said web; and d) laminating a current collecting substrate to said impregnated web to form said electrochemical cathode.
Claim 3
Dependent Claim
34 words
The process for forming an electrochemical cathode as defined in claim 1 wherein concentration of said silver salt in said solution is in an amount sufficient to form a silver precipitate after step (a).
Claim 4
Dependent Claim
23 words
The process for forming an electrochemical cathode as defined in claim 1 wherein said slurry of Ag°-adsorbed carbon particles includes a reducing agent.
Claim 5
Dependent Claim
39 words
The process for forming an electrochemical cathode as defined in claim 1, and further including the steps of forming and drying a sandwich of said current collecting substrate and said layers of said impregnated web prior to step c).
Claim 6
Dependent Claim
25 words
The process for forming an electrochemical cathode as defined in claim 2 wherein drying is effected at a temperature of from 200° to 300° F.
Claim 7
Dependent Claim
26 words
The process for forming an electrochemical cathode as defined in claim 1, 2 or 3 wherein said current collecting substrate is coated with a polytetrafluoroethylene dispersion.
Claim 8
Dependent Claim
26 words
The process for forming an electrochemical cathode as defined in claim 6, wherein laminating is effected at a temperature of about 150° to about 400° F.
Claim 9
Dependent Claim
19 words
The process for forming an electrochemical cathode as defined in claim 1 wherein said nonfibrous polymeric material is polytetrafluoroethylene.
Claim 10
Dependent Claim
32 words
The process for forming an electrochemical cathode as defined in claim 3 and further including a polymeric film in said sandwich in contact with one of said layers of said impregnated web.
Claim 11
Dependent Claim
32 words
The process for forming an electrochemical cathode as defined in claim 4 and further including a polymeric film in said sandwich in contact with one of said layers of said impregnated web.
Claim 12
Dependent Claim
29 words
The process for forming an electrochemical cathode as defined in claim 4 or 5 wherein step b), is effected with an embossing roller in contact with said polymeric film
Claim 13
Dependent Claim
29 words
The process for forming an electrochemical cathode as defined in claim 4 or 5 wherein said current collecting substrate is coated with a polytetrafluoroethylene dispersion prior to step c).
Claim 14
Dependent Claim
25 words
The process for forming an electrochemical cathode as defined in claim 8 wherein drying is effected at a temperature of from 200° to 300° F.
Claim 15
Dependent Claim
27 words
The process for forming an electrochemical cathode as defined in claim 11 wherein step c) is effected with an embossing roller in contact with said polymeric film.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-09-30 | 1995-04-01 | 1995-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-09-30 | 1999-04-01 | 1999-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-09-30 | 2003-04-01 | 2003-10-01 | $7700.00 | Window Closed / Lapsed |