US4287269A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrochemical cell and anode for an electrochemical cell
Assignee: South African Inventions Development Corp
•
Filing: 1979-08-29
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Granted: 1981-09-01
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Expires: 1999-08-29
Abstract
Abstract An electrochemical cell and an anode for use in an electrochemical cell are disclosed. The cell in its charged state comprises an anode, a cathode and an electrolyte. The anode comprises a polysulphide or a polyselenide of an alkali metal such as sodium, potassium, or lithium sorbed into a zeolite molecular sieve carrier.
Inventors
- 👤 Johan Coetzer
- 👤 Michael M. Thackeray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:15
CPC Classifications
H; H01; H01M; H01M10/00; H01M10/36; H01M4/00; H01M4/02; H01M4/64; H01M4/66; H01M4/664; H01M50/00; H01M50/40; H01M50/489; H01M50/497; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
96 words
An electrochemical cell comprising, in its charged state, an anode, a cathode, and an electrolyte, the anode comprising, as electrochemically active substances, an alkali metal and a chalcogen selected from the group consisting in sulphur and selenium, the alkali metal and chalcogen being combined together to form an alkali metal polysulphide or polyselenide, and being sorbed in a zeolite molecular sieve carrier in finely dispersed form, the chalcogen being held captive in the carrier and the alkali metal being capable of migrating in ionic form from the anode towards the cathode during discharge of the cell.
Claim 2
Dependent Claim
96 words
An electrochemical cell comprising, in its charged state, an anode, a cathode, and an electrolyte, the anode comprising, as electrochemically active substances, an alkali metal and a chalcogen selected from the group consisting in sulphur and selenium, the alkali metal and chalcogen being combined together to form an alkali metal polysulphide or polyselenide, and being sorbed in a zeolite molecular sieve carrier in finely dispersed form, the chalcogen being held captive in the carrier and the alkali metal being capable of migrating in ionic form from the anode towards the cathode during discharge of the cell.
Claim 3
Dependent Claim
34 words
A cell according to claim 1, in which the cathode comprises as electrochemically active cathode substance a substance selected from the group consisting of sulphur and selenium which is held captive in the cathode.
Claim 4
Dependent Claim
17 words
A cell according to claim 2, in which the cathode comprises an alkali metal polysulphide or polyselenide.
Claim 5
Dependent Claim
30 words
A cell according to claim 2, in which the electrochemically active substance of the cathode is held captive in the cathode by being sorbed in a zeolite molecular sieve carrier.
Claim 6
Dependent Claim
23 words
A cell as claimed in claim 4, in which the cathode includes a suitable electron conductive material to enhance the electronic conductivity thereof.
Claim 7
Dependent Claim
33 words
A cell according to claim 2, in which the electrochemically active substance of the cathode is held captive in the cathode by being in the form of a compound with a transition metal.
Claim 8
Dependent Claim
31 words
A cell according to claim 2, in which the electrochemically active substance of the cathode is held captive in the cathode by being in the form of a compound with aluminium.
Claim 9
Dependent Claim
22 words
A cell according to claim 1, including an alkali metal ion conductive barrier between the anode and the electrolyte to limit self-discharge.
Claim 10
Dependent Claim
19 words
A cell according to claim 1, in which the alkali metal of the anode comprises lithium, sodium or potassium.
Claim 11
Dependent Claim
17 words
A cell according to claim 1, in which the electrolyte comprises an alkali metal polysulphide or polyselenide.
Claim 12
Dependent Claim
18 words
A cell according to claim 10, in which the electrolyte includes a multiple alkali metal halide salt mixture.
Claim 13
Dependent Claim
17 words
A cell according to claim 10, in which the electrolyte includes an aluminium-sulphide, -polysulphide, -selenide, or -polyselenide.
Claim 14
Dependent Claim
16 words
A cell according to claim 10, in which the electrolyte is dissolved in an aprotic solvent.
Claim 15
Dependent Claim
27 words
A cell according to claim 10, in which a solid alkali metal ion conductive electrolyte is positioned between the electrolyte and at least one of the electrodes.
Claim 16
Dependent Claim
17 words
A cell according to claim 1, in which the electrolyte comprises an alkali metal halide-aluminium halide mixture.
Claim 17
Dependent Claim
18 words
A cell according to claim 1, in which the electrolyte is sorbed in a zeolite molecular sieve carrier.
Claim 18
Dependent Claim
18 words
A cell according to claim 1, in which the electrolyte comprises a solid alkali metal ion conductive electrolyte.
Claim 19
Dependent Claim
23 words
A cell as claimed in claim 1, in which the anode includes a suitable electron conductive material to enhance the electronic conductivity thereof.
Claim 20
Dependent Claim
94 words
An anode for use in an electrochemical cell as claimed in claim 1, the anode comprising, as electrochemically active substances, an alkali metal and a chalcogen selected from the group consisting in sulphur and selenium, the alkali metal and chalcogen being combined together to form an alkali metal polysulphide or polyselenide, and being sorbed in a zeolite molecular sieve carrier in finely dispersed form, the chalcogen being held captive in the carrier and the alkali metal being capable of migrating in ionic form from the anode towards the cathode during discharge of the cell.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-31 | 1985-03-02 | 1985-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-31 | 1989-03-02 | 1989-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-31 | 1993-03-02 | 1993-09-01 | $7700.00 | Window Closed / Lapsed |