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Patent US3980495A successfully refreshed from Google Patents.
US3980495A
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Calcium alloy as active material in secondary electrochemical cell
Assignee: Energy Research and Development Administration ERDA
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Filing: 1975-12-19
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Granted: 1976-09-14
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Expires: 1995-12-19
Abstract
Abstract Calcium alloys such as calcium-aluminum and calcium-silicon, are employed as active material within a rechargeable negative electrode of an electrochemical cell. Such cells can use a molten salt electrolyte including calcium ions and a positive electrode having sulfur, sulfides, or oxides as active material. The calcium alloy is selected to prevent formation of molten calcium alloys resulting from reaction with the selected molten electrolytic salt at the cell operating temperatures.
Inventors
- 👤 Michael F. Roche
- 👤 Sandra K. Preto
- 👤 Allan E. Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:17
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/36; H01M4/38; H01M10/00; H01M10/36; H01M10/39; H01M10/399; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
60 words
A secondary electrochemical cell including a positive electrode having active material selected from the group consisting of sulfur, a sulfur compound or mixtures thereof, a molten salt electrolyte including calcium ions and a negative electrode having an active material including a solid alloy of calcium and an element selected from groups 1A, 2A, 3A and 4A of the Periodic Table.
Claim 2
Dependent Claim
60 words
A secondary electrochemical cell including a positive electrode having active material selected from the group consisting of sulfur, a sulfur compound or mixtures thereof, a molten salt electrolyte including calcium ions and a negative electrode having an active material including a solid alloy of calcium and an element selected from groups 1A, 2A, 3A and 4A of the Periodic Table.
Claim 3
Dependent Claim
21 words
The electrochemical cell of claim 1 wherein said solid alloy comprises calcium and an element of lower atomic weight than calcium.
Claim 4
Dependent Claim
24 words
The electrochemical cell of claim 1 wherein said alloy comprises calcium and an element selected from the group consisting of aluminum, silicon, and magnesium.
Claim 5
Dependent Claim
17 words
The electrochemical cell of claim 1 wherein said alloy comprises a solid phase of calcium and aluminum.
Claim 6
Dependent Claim
18 words
The electrochemical cell of claim 1 wherein said solid alloy comprises a solid phase of calcium and silicon.
Claim 7
Dependent Claim
19 words
The electrochemical cell of claim 1 wherein said alloy comprises a solid, ternary phase of calcium, aluminum and silicon.
Claim 8
Dependent Claim
35 words
The electrochemical cell of claim 1 wherein said solid alloy comprises a solid solution of calcium and said element substantially free of phases having calcium metal as the solvent constituent of a substitutional solid solution.
Claim 9
Dependent Claim
32 words
The electrochemical cell of claim 1 wherein said solid alloy is an intermediate phase of calcium and at least one of said elements, said phase having compositional limits defined by intermetallic compounds.
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) | 1979-09-14 | 1980-03-15 | 1980-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-14 | 1984-03-15 | 1984-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-14 | 1988-03-15 | 1988-09-14 | $7700.00 | Window Closed / Lapsed |