Claims
- 1. 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.
- 2. A cathode current collector as claimed in claim 1 wherein the conductive metal is aluminium or an aluminium alloy.
- 3. A cathode current collector as claimed in claim 1 wherein the conductive metal is a nickel-based alloy containing chromium and iron.
- 4. 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.
- 5. 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.
- 6. 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.
- 7. A cathode current collector as claimed in claim 6 wherein the conductive material is a nickel chromium alloy.
- 8. A cathode current collector as claimed in claim 6 wherein the conductive material is a conductive carbide.
- 9. 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.
- 10. A sodium sulphur cell as claimed in claim 9 wherein said surface is a rough surface.
- 11. A sodium sulphur cell as claimed in claim 9 wherein the conductive metal rod or tube is of aluminium or aluminium alloy.
- 12. 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.
- 13. 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.
- 14. A sodium sulphur cell as claimed in claim 9 wherein the conductive metal is a nickel-based alloy containing chromium and iron.
- 15. 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.
- 16. 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.
- 17. 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.
- 18. 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.
- 19. 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.
- 20. 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.
- 21. 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.
Priority Claims (1)
Number |
Date |
Country |
Kind |
7944348 |
Dec 1979 |
GBX |
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Parent Case Info
This application is a division of application Ser. No. 408,573, filed Aug. 16, 1982, now U.S. Pat. No. 4,492,021 issued Jan. 8, 1985, which in turn is a continuation of application Ser. No. 217,334, filed Dec. 17, 1980, now abandoned.
US Referenced Citations (5)
Foreign Referenced Citations (1)
Number |
Date |
Country |
2263381 |
Jul 1974 |
DEX |
Divisions (1)
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Number |
Date |
Country |
Parent |
408573 |
Aug 1982 |
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Continuations (1)
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Number |
Date |
Country |
Parent |
217334 |
Dec 1980 |
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