Patent US4226922A successfully refreshed from Google Patents.
US4226922A
Expired / Lapsed
US
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Sodium sulfur electrochemical cell or battery
Assignee: Gas Technology Institute
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Filing: 1979-08-09
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Granted: 1980-10-07
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Expires: 1999-08-09
Abstract
Abstract A stable, long life sodium/sulfur electrochemical cell or battery wherein the cathodic current collector has a boronized surface in contact with the cathodic reactant and an additional boron source in physical proximity to the boronized current collector surface. In one embodiment, the cathodic current collector is the can or electrode container thereby providing a stable, long life cell casing protected from corrosion effects.
Inventors
- 👤 Anthony F. Sammells
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:12
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/64; H01M4/66; H01M10/00; H01M10/36; H01M10/39; H01M10/3909; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
78 words
In a sodium/sulfur electrochemical cell or battery having at least one anode chamber with anodic reactant and at least one cathode chamber with cathodic reactant and separated from each other by a sodium ion conducting solid electrolyte and having a cathodic current collector in contact with the cathodic reactant, the improvement comprising said cathodic current collector comprising a boronized surface in contact with said cathodic reactant and an additional boron source in physical proximity to said boronized surface.
Claim 2
Dependent Claim
78 words
In a sodium/sulfur electrochemical cell or battery having at least one anode chamber with anodic reactant and at least one cathode chamber with cathodic reactant and separated from each other by a sodium ion conducting solid electrolyte and having a cathodic current collector in contact with the cathodic reactant, the improvement comprising said cathodic current collector comprising a boronized surface in contact with said cathodic reactant and an additional boron source in physical proximity to said boronized surface.
Claim 3
Dependent Claim
30 words
The sodium/sulfur electrochemical cell or battery of claim 1 wherein said cathodic current collector comprises a low carbon steel can having a boronized surface in contact with said cathodic reactant
Claim 4
Dependent Claim
21 words
The sodium/sulfur electrochemical cell or battery of claim 2 wherein said boronized surface is about 0.050 to about 0.200 millimeters thick.
Claim 5
Dependent Claim
20 words
The sodium/sulfur electrochemical cell or battery of claim 2 wherein said additional boron source comprises boron in said cathodic reactant.
Claim 6
Dependent Claim
24 words
The sodium/sulfur electrochemical cell or battery of claim 4 wherein said boron comprises about 0.001 to about 10 weight percent of said cathodic reactant.
Claim 7
Dependent Claim
25 words
The sodium/sulfur electrochemical cell or battery of claim 2 wherein said additional boron source comprises boron carbide in a porous electrode in said cathodic reactant.
Claim 8
Dependent Claim
30 words
The sodium/sulfur electrochemical cell or battery of claim 1 wherein said cathodic current collector comprises a low carbon steel rod having a boronized surface in contact with said cathodic reactant.
Claim 9
Dependent Claim
21 words
The sodium/sulfur electrochemical cell or battery of claim 7 wherein said boronized surface is about 0.050 to about 0.200 millimeters thick.
Claim 10
Dependent Claim
20 words
The sodium/sulfur electrochemical cell or battery of claim 7 wherein said additional boron source comprises boron in said cathodic reactant.
Claim 11
Dependent Claim
24 words
The sodium/sulfur electrochemical cell or battery of claim 9 wherein said boron comprises about 0.001 to about 10 weight percent of said cathodic reactant.
Claim 12
Dependent Claim
25 words
The sodium/sulfur electrochemical cell or battery of claim 7 wherein said additional boron source comprises boron carbide in a porous electrode in said cathodic reactant.
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) | 1983-10-07 | 1984-04-07 | 1984-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-07 | 1988-04-07 | 1988-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-07 | 1992-04-07 | 1992-10-07 | $7700.00 | Window Closed / Lapsed |