Patent US2940887A successfully refreshed from Google Patents.
US3840407A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite porous electrode
Assignee: Textron Inc
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Filing: 1972-06-19
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Granted: 1974-10-08
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Expires: 1992-06-19
Abstract
Abstract A composite porous electrode for use as a gas-diffusion electrode in a battery assembly is formed by coating one surface of a porous plaque of non-corrosive metal with a layer of hydrophobic material, for repelling aqueous electrolyte solution, and coating the opposite surface with a layer of electronically conductive material dispersed in a hydrophobic binder therefor. The second coating is formed of a plurality of successive, integral layers of increasing concentration of electronically conductive material. Principally, for larger sized electrodes, the second coating is formed with a thickness differential from bottom to top to balance hydrostatic pressure differentials in the electrolyte. A battery assembly is provided in which a pair of porous electrodes are secured on opposite sides of a consumable electrode with aqueous electrolyte therebetween. The housing is formed with ducts and cavities to direct electrochemically reactive fluid, such as halogen gas, against the outer surfaces of the porous electrodes.
Inventors
- 👤 H Seiger
- 👤 N Yao
- 👤 R Oliver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:53
CPC Classifications
H; H01; H01M; H01M12/00; H01M12/04; H01M12/06; H01M12/065
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
89 words
A COMPOSITE POROUS ELECTRODE, COMPRISING: A POROUS METAL BODY HAVING A FIRST SURFACE FOR FACING ELECTROCHEMICALLY REACTIVE FLUID AND A SECOND SURFACE FOR FACING AQUEOUS ELECTROLYTE SOLUTION; A LAYER OF HYDROPHOBIC MATERIAL ON SAID FIRST SURFACE, SUBSTANTIALLY INERT TOHALOGEN, FOR REPELLING SAID ELECTROLYTE SOLUTION THEREFROM; A COATING OF ELECTRICALLY CONDUCTIVE PARTICLES DISPERSED IN A HYDROPHOBIC BINDER THEREFOR ON SAID SECOND SURFACE, THE CONCENTRATION OF SAID ELECTRICALLY CONDUCTIVE MATERIAL IN SAID COATING THEREOF BEING LOWER IN REGIONS SPACED RELATIVELY CLOSE TO SAID SECOND SURFACE THAN IN REGIONS SPACED FURTHER THEREFROM.
Claim 2
Dependent Claim
89 words
A COMPOSITE POROUS ELECTRODE, COMPRISING: A POROUS METAL BODY HAVING A FIRST SURFACE FOR FACING ELECTROCHEMICALLY REACTIVE FLUID AND A SECOND SURFACE FOR FACING AQUEOUS ELECTROLYTE SOLUTION; A LAYER OF HYDROPHOBIC MATERIAL ON SAID FIRST SURFACE, SUBSTANTIALLY INERT TOHALOGEN, FOR REPELLING SAID ELECTROLYTE SOLUTION THEREFROM; A COATING OF ELECTRICALLY CONDUCTIVE PARTICLES DISPERSED IN A HYDROPHOBIC BINDER THEREFOR ON SAID SECOND SURFACE, THE CONCENTRATION OF SAID ELECTRICALLY CONDUCTIVE MATERIAL IN SAID COATING THEREOF BEING LOWER IN REGIONS SPACED RELATIVELY CLOSE TO SAID SECOND SURFACE THAN IN REGIONS SPACED FURTHER THEREFROM.
Claim 3
Dependent Claim
60 words
The electrode of claim 1 wherein said coating of electrically conductive particles comprises at least a first region spaced relatively close to said second surface having a relatively low concentration of electrically conductive particles and a second region formed integral with said first regions, spaced further from said second surface, and having a relatively high concentration of electrically conductive particles.
Claim 4
Dependent Claim
51 words
The electrode of claim 2 wherein said first region contains about 35-65 weight percent of activated carbon as said electrically conductive particles and said second region contains a higher concentration of activated carbon than said first region, said higher concentration being in the range of about 60-90 weight percent activated carbon.
Claim 5
Dependent Claim
62 words
The electrode of claim 3 wherein said coating of said electrically conductive particles includes a third region integral with said second region, spaced further from said second surface than said second region and containing a higher concentration of activated carbon than said second region, said higher concentration of said third region being in the range of about 80-99 weight percent activated carbon.
Claim 6
Dependent Claim
16 words
The electrode of claim 4 wherein said third region is substantially thinner than said second region.
Claim 7
Dependent Claim
23 words
The electrode of claim 1 including hydrophobic material coated on said second surface and formed integral with said coating of electrically conductive particles.
Claim 8
Dependent Claim
33 words
The electrode of claim 1 wherein said electrically conductive material comprises activated carbon having a surface area greater than about 900 m2/gm and an ash content of less than about 1.5 weight percent.
Claim 9
Dependent Claim
23 words
The electrode of claim 1 wherein said porous metal body is formed of a metal selected from titanium, zirconium, hafnium and alloys thereof.
Claim 10
Dependent Claim
14 words
The electrode of claim 1 wherein said porous metal body is formed of titanium.
Claim 11
Dependent Claim
16 words
The electrode of claim 1 wherein said metal body has a porosity of about 25-55 percent.
Claim 12
Dependent Claim
23 words
The electrode of claim 1 in which said coating of conductive particles has a porosity of about 40 percent to about 80 percent.
Claim 13
Dependent Claim
21 words
The electrode Of claim 1 wherein said hydrophobic coating on said first surface and said binder material comprise a polyfluorolefin resin.
Claim 14
Dependent Claim
108 words
A porous composite electrode having a thickness differential between the bottom and top edges thereof, comprising: a porous metal body having a first surface for facing electrochemically reactive fluid and a second surface for facing aqueous electrolyte solution; a layer of hydrophobic material on said first surface, substantially inert to halogen, for repelling said electrolyte solution therefrom; a coating of electrically conductive particles dispersed in a hydrophobic binder therefor on said second surface; and means for making electrical contact to said metal body; said electrode having a thickness of first magnitude along the bottom edge and increasing therefrom to a thickness of greater magnitude along its top edge.
Claim 15
Dependent Claim
108 words
A porous composite electrode having a thickness differential between the bottom and top edges thereof, comprising: a porous metal body having a first surface for facing electrochemically reactive fluid and a second surface for facing aqueous electrolyte solution; a layer of hydrophobic material on said first surface, substantially inert to halogen, for repelling said electrolyte solution therefrom; a coating of electrically conductive particles dispersed in a hydrophobic binder therefor on said second surface; and means for making electrical contact to said metal body; said electrode having a thickness of first magnitude along the bottom edge and increasing therefrom to a thickness of greater magnitude along its top edge.
Claim 16
Dependent Claim
19 words
The electrode of claim 13 wherein said increase in thickness is substantially uniform along the length of said electrode.
Claim 17
Dependent Claim
19 words
The electrode of claim 13 wherein said coating of said electrically conductive material is formed with said thickness differential.
Claim 18
Dependent Claim
24 words
The electrode of claim 15 wherein the thickness differential of said coating of electrically conductive material is about 3-14 percent per inch length thereof.
Claim 19
Dependent Claim
15 words
The electrode of claim 13 wherein said metal body is formed with said thickness differential.
Claim 20
Dependent Claim
21 words
The electrode of claim 17 wherein the thickness differential of said metal body is about 3-14 percent per inch length thereof.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-07 | 1978-04-08 | 1978-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-07 | 1982-04-08 | 1982-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-07 | 1986-04-08 | 1986-10-08 | $7700.00 | Window Closed / Lapsed |