Patent US4568620A successfully refreshed from Google Patents.
US4568620A
Expired / Lapsed
US
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Sodium sulphur cells and cathode current collectors for such cells
Assignee: Silent Power GmbH fur Energiespeichertechnik
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Filing: 1984-07-13
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Granted: 1986-02-04
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Expires: 2004-07-13
Abstract
Abstract In a sodium sulphur cell, improved protection of a cathode current collector is obtained by isostatically pressing graphite foil or flakes onto the surface of the collector, which surface is preferably roughened or coated with an intermediate conductive layer such as a nickel-chromium alloy or a conductive carbide providing a rough surface.
Inventors
- 👤 Michael L. Wright
- 👤 Alec R. Tilley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:26
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/64; H01M4/66; H01M4/661; H01M10/00; H01M10/36; H01M10/39; H01M10/3909; H01M4/663; H01M4/664; H01M10/3954; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y10; Y10S; Y10S228/00; Y10S228/903; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49108; Y10T29/49115; Y10T29/49805; Y10T29/49826; Y10T29/49885; Y10T29/49886
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
62 words
A cathode current collector for a sodium sulphur cell formed of a conductive metal having a surface onto which or onto at least part of the surface of which a layer of a material consisting of graphite foil or graphite flakes has been adhered by a step consisting of isostatic pressing to force the foil or flakes to adhere to the surface.
Claim 2
Dependent Claim
62 words
A cathode current collector for a sodium sulphur cell formed of a conductive metal having a surface onto which or onto at least part of the surface of which a layer of a material consisting of graphite foil or graphite flakes has been adhered by a step consisting of isostatic pressing to force the foil or flakes to adhere to the surface.
Claim 3
Dependent Claim
19 words
A cathode current collector as claimed in claim 1 wherein the conductive metal is aluminium or an aluminium alloy.
Claim 4
Dependent Claim
21 words
A cathode current collector as claimed in claim 1 wherein the conductive metal is a nickel-based alloy containing chromium and iron.
Claim 5
Dependent Claim
55 words
A cathode current collector as claimed in claim 1 and for use in a sodium sulphur cell wherein the conductive metal is mild steel with a protective coating of an electrically conductive material chemically inert to the cathodic reactant of a sodium sulphur cell on which coating is applied the graphite foil or graphite flakes.
Claim 6
Dependent Claim
29 words
A cathode current collector as claimed in claim 1 wherein said conductive metal has a rough surface onto which the layer of graphite foil or graphite flakes is applied.
Claim 7
Dependent Claim
32 words
A cathode current collector as claimed in claim 5 wherein the rough surface is constituted by a layer of conductive material between the conductive metal and the graphite foil or graphite flakes.
Claim 8
Dependent Claim
18 words
A cathode current collector as claimed in claim 6 wherein the conductive material is a nickel chromium alloy.
Claim 9
Dependent Claim
17 words
A cathode current collector as claimed in claim 6 wherein the conductive material is a conductive carbide.
Claim 10
Dependent Claim
84 words
A sodium sulphur cell having a tubular electrolyte element separating sodium around the outer surface of the electrolyte element from cathodic reactant inside the tubular electrolyte element and wherein there is provided a cathode current collector comprising a conductive metal rod or tube arranged axially within the electrolyte element, this metal rod or tube having a surface covered with a material consisting of graphite foil or graphite flakes adhered onto the surface of the rod or tube by a step consisting of isostatic pressing.
Claim 11
Dependent Claim
84 words
A sodium sulphur cell having a tubular electrolyte element separating sodium around the outer surface of the electrolyte element from cathodic reactant inside the tubular electrolyte element and wherein there is provided a cathode current collector comprising a conductive metal rod or tube arranged axially within the electrolyte element, this metal rod or tube having a surface covered with a material consisting of graphite foil or graphite flakes adhered onto the surface of the rod or tube by a step consisting of isostatic pressing.
Claim 12
Dependent Claim
16 words
A sodium sulphur cell as claimed in claim 9 wherein said surface is a rough surface.
Claim 13
Dependent Claim
22 words
A sodium sulphur cell as claimed in claim 9 wherein the conductive metal rod or tube is of aluminium or aluminium alloy.
Claim 14
Dependent Claim
33 words
A sodium sulphur cell as claimed in claim 9 wherein the rod or tube has a surface coating of a nickel-chromium alloy, onto which is isostatically pressed the graphite foil or graphite flakes.
Claim 15
Dependent Claim
33 words
A sodium sulphur cell as claimed in claim 9 wherein the rod or tube has a surface coating of a conductive carbide onto which is isostatically pressed the graphite foil or graphite flakes.
Claim 16
Dependent Claim
21 words
A sodium sulphur cell as claimed in claim 9 wherein the conductive metal is a nickel-based alloy containing chromium and iron.
Claim 17
Dependent Claim
47 words
A sodium sulphur cell as claimed in claim 9 wherein the conductive metal is mild steel with a protective coating of an electrically conductive material chemically inert to the cathodic reactant of the sodium sulphur cell on which coating is applied the graphite foil or graphite flakes.
Claim 18
Dependent Claim
71 words
A cathode current collector for a sodium sulphur cell consisting of a conductive metal with a surface having a roughness above one micron onto which or onto at least part of which a material consisting of a homogenized, densified layer of graphite foil or graphite flakes has been adhered by a step consisting of isostatic pressing, which layer will withstand the conditions in the cathodic region of a sodium sulphur cell.
Claim 19
Dependent Claim
71 words
A cathode current collector for a sodium sulphur cell consisting of a conductive metal with a surface having a roughness above one micron onto which or onto at least part of which a material consisting of a homogenized, densified layer of graphite foil or graphite flakes has been adhered by a step consisting of isostatic pressing, which layer will withstand the conditions in the cathodic region of a sodium sulphur cell.
Claim 20
Dependent Claim
32 words
A cathode current collector as claimed in claim 16 wherein the conductive metal is selected from the group consisting of aluminum, an aluminum alloy or a nickel-based alloy containing chromium and iron.
Claim 21
Dependent Claim
98 words
A cathode current collector for a sodium sulphur cell consisting of a conductive metal with a surface having a roughness above one micron onto which or onto at least part of which a material consisting of a homogenized, densified layer of graphite foil or graphite flakes has been adhered by a step consisting of isostatic pressing, which layer will withstand the conditions in the cathodic region of a sodium sulphur cell, wherein the conductive metal is mild steel with a protective coating of an electrically conductive material chemically inert to the cathodic reactant of the sodium sulphur cell.
Claim 22
Dependent Claim
98 words
A cathode current collector for a sodium sulphur cell consisting of a conductive metal with a surface having a roughness above one micron onto which or onto at least part of which a material consisting of a homogenized, densified layer of graphite foil or graphite flakes has been adhered by a step consisting of isostatic pressing, which layer will withstand the conditions in the cathodic region of a sodium sulphur cell, wherein the conductive metal is mild steel with a protective coating of an electrically conductive material chemically inert to the cathodic reactant of the sodium sulphur cell.
Claim 23
Dependent Claim
53 words
A sodium sulphur cell having a tubular electrolyte element separating sodium around the outer surface of the electrolyte element from cathodic reactant inside the tubular electrolytic element and wherein there is provided a cathode current collector of claim 16 in the shape of a rod or tube arranged axially within the electrolyte element.
Claim 24
Dependent Claim
53 words
A sodium sulphur cell having a tubular electrolyte element separating sodium around the outer surface of the electrolyte element from cathodic reactant inside the tubular electrolytic element and wherein there is provided a cathode current collector of claim 17 in the shape of a rod or tube arranged axially within the electrolyte element.
Claim 25
Dependent Claim
53 words
A sodium sulphur cell having a tubular electrolyte element separating sodium around the outer surface of the electrolyte element from cathodic reactant inside the tubular electrolytic element and wherein there is provided a cathode current collector of claim 18 in the shape of a rod or tube arranged axially within the electrolyte element.
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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) | 1989-02-03 | 1989-08-05 | 1990-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-03 | 1993-08-05 | 1994-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-03 | 1997-08-05 | 1998-02-04 | $7700.00 | Window Closed / Lapsed |