US3941612A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode composition for electrochemical cell
Assignee: Energy Research and Development Administration ERDA
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Filing: 1975-03-04
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Granted: 1976-03-02
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Expires: 1995-03-04
Abstract
Abstract A high-temperature, secondary electrochemical cell includes a negative electrode containing an alkali metal such as lithium, an electrolyte of molten salt containing ions of that alkali metal and a positive electrode containing a mixture of metallic sulfides. The positive electrode composition is contained within a porous structure that permits permeation of molten electrolyte and includes a mixture of about 5% to 30% by weight Cu2S in FeS.
Inventors
- 👤 Robert K. Steunenberg
- 👤 Allan E. Martin
- 👤 Zygmunt Tomczuk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:36
CPC Classifications
H; H01; H01M; H01M10/00; H01M10/36; H01M10/39; H01M10/399; H01M4/00; H01M4/02; H01M4/36; H01M4/58; H01M4/581; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
60 words
In a secondary, high-temperature electrochemical cell including an alkali metal reactant in the anode, a cathode reactant composition including a chalcogen compound in the cathode and an electrolyte containing ions of said alkali metal, the improvement wherein said cathode reactant composition comprises a mixture of a major proportion by weight FeS and a minor proportion by weight Cu 2 S.
Claim 2
Dependent Claim
60 words
In a secondary, high-temperature electrochemical cell including an alkali metal reactant in the anode, a cathode reactant composition including a chalcogen compound in the cathode and an electrolyte containing ions of said alkali metal, the improvement wherein said cathode reactant composition comprises a mixture of a major proportion by weight FeS and a minor proportion by weight Cu 2 S.
Claim 3
Dependent Claim
24 words
The improvement of claim 1 wherein said cathode reactant composition comprises 80% to 84% FeS and 16% to 20% Cu 2 S by weight.
Claim 4
Dependent Claim
22 words
The improvement of claim 1 wherein said cathode reactant composition comprises a powdered mixture of FeS particles and Cu 2 S particles.
Claim 5
Dependent Claim
47 words
The improvement of claim 1 wherein said cathode reactant composition is a powder of about 100 to 400 microns individual particle size, and wherein most of said individual particles comprises a solid solution of Cu 2 S in FeS, and ternary phases of Fe, Cu and S.
Claim 6
Dependent Claim
70 words
The improvement of claim 1 wherein said cathode reactant composition is a uniform mixture of FeS and Cu 2 S formed by melting said FeS and Cu 2 S together at 1200°C., uniformly blending said melt, cooling to less than about 900°C. in less than about 3 minutes to solidify said melt into an ingot and grinding said ingot into a powder of less than 400 microns average particle size.
Claim 7
Dependent Claim
22 words
The improvement of claim 1 wherein said cathode composition includes an inert, electrically conductive material contacting said FeS and Cu 2 S.
Claim 8
Dependent Claim
13 words
The improvement of claim 6 wherein said inert, electrically conductive material is iron.
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) | 1979-03-02 | 1979-09-01 | 1980-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-02 | 1983-09-01 | 1984-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-02 | 1987-09-01 | 1988-03-02 | $7700.00 | Window Closed / Lapsed |