US3898098A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing iron electrode
Assignee: Huntington Alloys Corp
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Filing: 1974-05-31
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Granted: 1975-08-05
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Expires: 1994-05-31
Abstract
Abstract Process for producing electrode structures which are suitable for use as the negative electrode in nickel-iron storage batteries. The active mass is electrodeposited under controlled conditions from an aqueous electrolyte containing ferrous ions and ammonium ions, and preferably, in addition, a sulphur containing compound and a buffering agent to maintain the pH in the range of 1 to 5.5. The electrolyte can also contain a small amount of copper ion.
Inventors
- 👤 Robert D Giles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:15
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/36; H01M4/48; H01M4/52; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
86 words
A METHOD FOR PRODUCING IRON ACTTIVE MASS WHICH COMPRISES ELECTRODEPOSITING SAID MASS ON A CATHODE FROM AN AQUEOUS ELECTROLYTE CONTAINING FERROUS ION AND AMMONIUM ION SAID ELECTROLYTE BEING CHARACTERIZED BY HAVING A PH OF ABOUT 2.5 TO 5.5 AND THE ELECTRODEPOSITION BEING CHARACTERIZED BY CONTROLLED INTERRELATION OF CATHODE CURRENT DENSITY, PH AND COMPOSITION OF THE ELECTROLYTE TO PROVIDE AN ELECTRODEPOSIT OF IRON ACTIVE MASS COMPRISING ESSENTIALLY OXIDIC IRON WITH NO MORE THAN ABOUT 60% BY WEIGHT OF THE ACTIVE MASS BEING IN THE METALLIC UNOXIDIZED STATE.
Claim 2
Independent Claim
86 words
A METHOD FOR PRODUCING IRON ACTTIVE MASS WHICH COMPRISES ELECTRODEPOSITING SAID MASS ON A CATHODE FROM AN AQUEOUS ELECTROLYTE CONTAINING FERROUS ION AND AMMONIUM ION SAID ELECTROLYTE BEING CHARACTERIZED BY HAVING A PH OF ABOUT 2.5 TO 5.5 AND THE ELECTRODEPOSITION BEING CHARACTERIZED BY CONTROLLED INTERRELATION OF CATHODE CURRENT DENSITY, PH AND COMPOSITION OF THE ELECTROLYTE TO PROVIDE AN ELECTRODEPOSIT OF IRON ACTIVE MASS COMPRISING ESSENTIALLY OXIDIC IRON WITH NO MORE THAN ABOUT 60% BY WEIGHT OF THE ACTIVE MASS BEING IN THE METALLIC UNOXIDIZED STATE.
Claim 3
Dependent Claim
33 words
A method as in claim 1 wherein the ferrous ion and ammonium ion are derived from a ferrous ammonium salt selected from the group consisting of ferrous ammonium sulphate, and ferrous ammonium sulphamate.
Claim 4
Dependent Claim
38 words
A method as in claim 2 which comprises maintaining the ferrous ammonium salt at a concentration of from about 0.1M to about 0.65M, and electrodepositing at a cathode current density up to about 140 milliamperes per square centimeter.
Claim 5
Dependent Claim
18 words
A method as in claim 3 wherein the cathode current density is about 20 to about 100 mA/cm2.
Claim 6
Dependent Claim
15 words
A method as in claim 4 wherein the pH is about 3 to about 4.4.
Claim 7
Dependent Claim
38 words
A method as in claim 3 wherein the pH is maintained within the required range by buffering the electrolyte with a buffer selected from the group consisting of alkali metal phosphates, alkali metal tartrates and alkali metal lactates.
Claim 8
Dependent Claim
48 words
A method as in claim 1 where the electrolyte contains a water soluble, sulphur containing material having sulphur in an oxidation state lower than the oxidation state of sulphur in the sulfate ion and which is incapable of releasing into the electrolyte any significant amount of sulfide ion.
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) | 1978-08-04 | 1979-02-03 | 1979-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-04 | 1983-02-03 | 1983-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-04 | 1987-02-03 | 1987-08-05 | $7700.00 | Window Closed / Lapsed |