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US4423124A
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Lithium-metal chromate organic electrolyte cell and method for cathode
Assignee: Duracell Inc USA
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Filing: 1976-12-27
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Granted: 1983-12-27
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Expires: 1996-12-27
Abstract
Abstract A method for preparing metal chromate cathode electrodes for use in non-aqueous lithium/chromate cells for medium to high discharge rate service is described. Cells utilizing such cathodes are also described. Chromates used include the chromates, dichromates and basic chromates of silver, copper, mercury and lead. The cathodes can be prepared without internal conductive elements or cohesive binders.
Inventors
- 👤 Arabinda N. Dey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:41
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/06; H01M4/08; H01M4/36; H01M4/58; H01M4/5825; H01M6/00; H01M6/14; H01M6/16; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49108; Y10T29/49115
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
56 words
A non-aqueous primary battery having (a) a light metal anode selected from the group consisting of lithium, magnesium, aluminum, beryllium, calcium, sodium, and potassium; (b) an electrolyte solution comprised of an organic solvent and a light inorganic salt dissolved therein; (c) a separator; and (d) a cathode consisting of silver chromate without binder or conductive additives.
Claim 2
Dependent Claim
56 words
A non-aqueous primary battery having (a) a light metal anode selected from the group consisting of lithium, magnesium, aluminum, beryllium, calcium, sodium, and potassium; (b) an electrolyte solution comprised of an organic solvent and a light inorganic salt dissolved therein; (c) a separator; and (d) a cathode consisting of silver chromate without binder or conductive additives.
Claim 3
Dependent Claim
13 words
The battery of claim 1 in which the light metal anode is lithium.
Claim 4
Dependent Claim
13 words
The battery of claim 1 in which the non-aqueous solvent is propylene carbonate.
Claim 5
Dependent Claim
29 words
The battery of claim 3 in which the light metal inorganic salt is lithium perchlorate and the concentration of the salt in the electrolytic solution is about 1 molar.
Claim 6
Dependent Claim
28 words
The battery of claim 3 wherein the light metal inorganic salt is lithium hexafluoroarsenate and the concentration of the salt in the electrolytic solution is about 1 molar.
Claim 7
Dependent Claim
23 words
The battery of claim 1 in which the light metal anode is lithium, and the electrolytic solution is propylene carbonate containing lithium perchlorate.
Claim 8
Independent Claim
78 words
A method for preparing cathodes of metal chromates for use in high energy density, organic-electrolyte, electrochemical cells which consists essentially of the steps of compressing powdered metal chromate and uncured binder into cathode form at a pressure in the range 1500-5000 psi, and maintaining said cathodes at a temperature below about 25° C. throughout the formation of the cathodes, wherein said metal chromate is selected from the group consisting of metal chromates, metal dichromates and metal basic chromates.
Claim 9
Independent Claim
78 words
A method for preparing cathodes of metal chromates for use in high energy density, organic-electrolyte, electrochemical cells which consists essentially of the steps of compressing powdered metal chromate and uncured binder into cathode form at a pressure in the range 1500-5000 psi, and maintaining said cathodes at a temperature below about 25° C. throughout the formation of the cathodes, wherein said metal chromate is selected from the group consisting of metal chromates, metal dichromates and metal basic chromates.
Claim 10
Dependent Claim
22 words
The method according to claim 7 wherein said cathode in final form contains up to 5 percent of uncured fluorinated hydrocarbon binder.
Claim 11
Dependent Claim
34 words
The method according to claim 7 wherein said chromate is basic mercuric chromate having the formula (HgO) x (CrO 3 ) y wherein the mole ratio of x/y varies from about 1:1 to 1:0.22.
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) | 1986-12-26 | 1987-06-27 | 1987-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-26 | 1991-06-27 | 1991-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-26 | 1995-06-27 | 1995-12-27 | $7700.00 | Window Closed / Lapsed |