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US4456665A
Expired / Lapsed
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Calcium electrochemical reserve cell
Assignee: Ramot at Tel Aviv University Ltd
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Filing: 1982-07-09
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Granted: 1984-06-26
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Expires: 2002-07-09
Abstract
Abstract There is provided an electrochemical reserve cell of short activation time, which comprises a calcium dischargeable calcium alloy anode essentially devoid of alkali metal, an inorganic oxyhalide liquid cathode serving also as solvent for the electrolyte salt, an electrolyte salt consisting of Lewis acid and a calcium Lewis base, said Lewis acid being in excess of the Lewis base, and an inert current collector, said electrolyte solution being stored separately from said electrode compartment, means being provided for contacting said solution with said electrodes when the cell is to be activated.
Inventors
- 👤 Emanuel Peled
- 👤 Azieh Meitav
- 👤 Mordechai Brand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:31
CPC Classifications
H; H01; H01M; H01M6/00; H01M6/14; H01M4/00; H01M4/02; H01M4/36; H01M4/38; H01M4/40; H01M4/64; H01M4/66; H01M4/661; H01M4/663; H01M6/30; H01M6/32
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
87 words
An electrochemical reserve cell of short activation time comprising: a calcium dischargeable calcium alloy anode essentially devoid of alkali metal; an inorganic oxyhalide liquid cathode serving also as solvent for the electrolyte salt; an electrolyte salt consisting of Lewis acid and a calcium Lewis base, said Lewis acid being in excess of the Lewis base, and an inert current collector; said electrolyte solution being stored separately from said electrode compartment, means being provided for contacting said solution with said electrodes when the cell is to be activated.
Claim 2
Dependent Claim
87 words
An electrochemical reserve cell of short activation time comprising: a calcium dischargeable calcium alloy anode essentially devoid of alkali metal; an inorganic oxyhalide liquid cathode serving also as solvent for the electrolyte salt; an electrolyte salt consisting of Lewis acid and a calcium Lewis base, said Lewis acid being in excess of the Lewis base, and an inert current collector; said electrolyte solution being stored separately from said electrode compartment, means being provided for contacting said solution with said electrodes when the cell is to be activated.
Claim 3
Dependent Claim
14 words
A reserve cell according to claim 1, wherein the liquid cathode is thionyl chloride.
Claim 4
Dependent Claim
31 words
A reserve cell according to claim 1, wherein the Lewis acid is selected from aluminum chloride, aluminum bromide, boron trichloride, iron trichloride, iron thibromide and a mixture of any of these.
Claim 5
Dependent Claim
20 words
A cell according to claim 1, wherein the Lewis base is selected from calcium chloride, calcium bromide and calcium oxide.
Claim 6
Dependent Claim
18 words
A cell according to claim 1, wherein the concentration of the Lewis acid is from 1.5M to 3M.
Claim 7
Dependent Claim
18 words
A cell according to claim 1, wherein the concentration of the Lewis base is from 0.1M to saturation.
Claim 8
Dependent Claim
14 words
A cell according to claim 1, wherein the current collector comprises porous Teflon-bonded carbon.
Claim 9
Dependent Claim
24 words
A cell according to claim 7, wherein the porous current collector comprises up to 50 wt-% of a catalytically active metal or metal oxide.
Claim 10
Dependent Claim
26 words
A cell according to claim 8, wherein the catalyst is selected from copper, iron, or tungsten, and oxides of same, and from a mixture of same.
Claim 11
Dependent Claim
13 words
A cell according to claim 1, containing up to 15 v-% sulfur dioxide.
Claim 12
Dependent Claim
26 words
A cell according to claim 1, wherein the anode is calcium which has been annealed in an inert atmosphere at 450°-750° C. prior to cell assembly.
Claim 13
Dependent Claim
12 words
A multi-cell battery comprising a plurality of cells claimed in claim 1.
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) | 1987-06-26 | 1987-12-26 | 1988-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-26 | 1991-12-26 | 1992-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-26 | 1995-12-26 | 1996-06-26 | $7700.00 | Window Closed / Lapsed |