Patent US4356241A successfully refreshed from Google Patents.
US4356241A
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Sodium sulphur cells
Assignee: Chloride Silent Power Ltd
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Filing: 1981-07-07
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Granted: 1982-10-26
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Expires: 2001-07-07
Abstract
Abstract In a sodium sulphur cell having beta alumina solid electrolyte material separating an anodic region containing sodium from a cathodic region, the surface of the electrolyte exposed to the sodium is pretreated with a first metal, conveniently lead, which will form an alloy with sodium and the anodic region contains a second metal, e.g. titanium or aluminium which will react with sodium oxide to form a sodium oxide compound of the second metal or an oxide thereof. The combined effect of these features gives a significant improvement in preventing resistance rise of the cell on discharge.
Inventors
- 👤 Michael L. Wright
- 👤 Michael D. Hames
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:09
CPC Classifications
H; H01; H01M; H01M10/00; H01M10/36; H01M10/39; H01M10/3909; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
92 words
A sodium sulphur cell having a beta-alumina solid electrolyte element separating an anodic region containing sodium from a cathodic region containing sulphur/sodium polysulphides, said beta-alumina solid electrolyte element has had at least part of its surface, to be exposed to the sodium, pretreated with a first metal which will form an alloy of sodium, wherein there is provided, in the anodic region adjacent the electrolyte element, a second metal which will react with sodium oxide (Na 2 O) to form a sodium oxide compound with the second metal or an oxide thereof.
Claim 2
Dependent Claim
92 words
A sodium sulphur cell having a beta-alumina solid electrolyte element separating an anodic region containing sodium from a cathodic region containing sulphur/sodium polysulphides, said beta-alumina solid electrolyte element has had at least part of its surface, to be exposed to the sodium, pretreated with a first metal which will form an alloy of sodium, wherein there is provided, in the anodic region adjacent the electrolyte element, a second metal which will react with sodium oxide (Na 2 O) to form a sodium oxide compound with the second metal or an oxide thereof.
Claim 3
Dependent Claim
15 words
A sodium sulphur cell as claimed in claim 1 wherein said second metal is titanium.
Claim 4
Dependent Claim
19 words
A sodium sulphur cell as claimed in claim 2 wherein the titanium is in the form of a sponge.
Claim 5
Dependent Claim
15 words
A sodium sulphur cell as claimed in claim 1 wherein the second metal is aluminium.
Claim 6
Dependent Claim
18 words
A sodium sulphur cell as claimed in claim 4 wherein the aluminium is in powder or flake form.
Claim 7
Dependent Claim
27 words
A sodium sulphur cell as claimed in claim 1 wherein said second metal is a metal selected from the group consisting of magnesium, zirconium, yttrium and uranium.
Claim 8
Dependent Claim
27 words
A sodium sulphur cell as claimed in claim 1 wherein the anodic region adjacent the electrolyte contains a further particulate material in addition to said second metal.
Claim 9
Dependent Claim
18 words
A sodium sulphur cell as claimed in claim 7 wherein said further particulate material is an inert material.
Claim 10
Dependent Claim
36 words
A sodium sulphur cell as claimed in claim 7 wherein said second metal constitutes at least 1 atomic % of an insoluble metal or sufficient of a soluble metal to give a saturated solution in sodium.
Claim 11
Dependent Claim
15 words
A sodium sulphur cell as claimed in claim 1 wherein said first metal is lead.
Claim 12
Dependent Claim
37 words
A sodium sulphur cell as claimed in claim 1 wherein the cell is cylindrical with the sodium in an annular region between an anode current collector and one surface of a beta-alumina tube forming said electrolyte element.
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) | 1985-10-25 | 1986-04-26 | 1986-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-25 | 1990-04-26 | 1990-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-25 | 1994-04-26 | 1994-10-26 | $7700.00 | Window Closed / Lapsed |