US3877986A
Expired / Lapsed
US
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Rechargeable cell having improved cadmium negative electrode and method of producing same
Assignee: Gates Energy Products Inc
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Filing: 1972-07-25
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Granted: 1975-04-15
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Expires: 1992-07-25
Abstract
Abstract A rechargeable cell is disclosed having an improved cadmium negative electrode comprising a mixture of cadmium metal powder and cadmium oxide powder mixed with a binder and applied to a foraminous substrate which is preferably a conductor. The particle shape and size of the cadmium metal, as well as the percentage of cadmium metal, is important. The cell has a higher energy density and improved anti-fading properties.
Inventors
- 👤 Henry A Catherino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 00:33
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/36; H01M4/48; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
61 words
AN IMPROVED CADMIUM NEGATIVE ELECTRODE COMPRISING A MIXTURE OF CADMIUM OXIDE PAWER; GENERALLY SPHERICALLY SHAPED CADMIUM METAL PARTICLES FORMED BY CONDENSING CADMIUM METAL VAPORS IN THE PRESENCE OF OXYGEN, SAID PARTICLES HAVING AN AVERAGE PARTICLE SIZE OF APPROXIMATELY 3-12 MICRONS AND STABILIZED WITH A MINOR AMOUNT OF CDO; AND A BINDER; AND APPLIED TO A FORAMINOUS SUBSTRATE TO FORM AN ELECTRODE.
Claim 2
Dependent Claim
61 words
AN IMPROVED CADMIUM NEGATIVE ELECTRODE COMPRISING A MIXTURE OF CADMIUM OXIDE PAWER; GENERALLY SPHERICALLY SHAPED CADMIUM METAL PARTICLES FORMED BY CONDENSING CADMIUM METAL VAPORS IN THE PRESENCE OF OXYGEN, SAID PARTICLES HAVING AN AVERAGE PARTICLE SIZE OF APPROXIMATELY 3-12 MICRONS AND STABILIZED WITH A MINOR AMOUNT OF CDO; AND A BINDER; AND APPLIED TO A FORAMINOUS SUBSTRATE TO FORM AN ELECTRODE.
Claim 3
Dependent Claim
27 words
The electrode of claim 1 wherein said cadmium oxide has a particle size of about 1 micron and comprises about 60-75% by weight of the powder mixture.
Claim 4
Dependent Claim
19 words
The electrode of claim 2 wherein said cadmium metal particles comprise about 25-40% by weight of the powder mixture.
Claim 5
Dependent Claim
13 words
The electrode of claim 3 wherein said binder comprises an unsintered fluorocarbon binder.
Claim 6
Dependent Claim
94 words
An improved cadmium negative electrode for a rechargeable cell comprising a foraminous substrate having thereon a pasted mixture of about 60-75% by weight cadmium oxide having an average particle size of about 1 micron; and about 25-40% by weight generally spherically shaped cadmium metal particles having an average particle size of about 3-12 microns and formed by condensing cadmium metal vapors in the presence of a minor amount of oxygen to stabilize the metal powder; about 1% by weight of a conductive metallic powder; and about 1% by weight of an unsintered fluorocarbon binder.
Claim 7
Dependent Claim
94 words
An improved cadmium negative electrode for a rechargeable cell comprising a foraminous substrate having thereon a pasted mixture of about 60-75% by weight cadmium oxide having an average particle size of about 1 micron; and about 25-40% by weight generally spherically shaped cadmium metal particles having an average particle size of about 3-12 microns and formed by condensing cadmium metal vapors in the presence of a minor amount of oxygen to stabilize the metal powder; about 1% by weight of a conductive metallic powder; and about 1% by weight of an unsintered fluorocarbon binder.
Claim 8
Dependent Claim
96 words
An improved process for producing a cadmium negative electrode for a rechargeable cell having enhanced antifading properties comprising: a. providing generally spherically shaped particles of stabilized cadmium metal powder formed by condensing cadmium metal vapors in the presence of oxygen, said particles having an average particle size of about 3-12 microns and containing a minor amount of CdO to inhibit oxidation of the metallic powder; b. mixing together said metallic cadmium powder with cadmium oxide powder and a binder to form a mixture; and c. applying the mixture to a foraminous substrate to form an electrode.
Claim 9
Dependent Claim
96 words
An improved process for producing a cadmium negative electrode for a rechargeable cell having enhanced antifading properties comprising: a. providing generally spherically shaped particles of stabilized cadmium metal powder formed by condensing cadmium metal vapors in the presence of oxygen, said particles having an average particle size of about 3-12 microns and containing a minor amount of CdO to inhibit oxidation of the metallic powder; b. mixing together said metallic cadmium powder with cadmium oxide powder and a binder to form a mixture; and c. applying the mixture to a foraminous substrate to form an electrode.
Claim 10
Dependent Claim
23 words
The process of claim 6 wherein said cadmium metal powder is mixed with cadmium oxide having a particle size of about 1 micron.
Claim 11
Dependent Claim
27 words
The process of claim 7 wherein said metallic cadmium powder and cadmium oxide powder are further mixed with about 1% by weight of a conductive metallic powder.
Claim 12
Dependent Claim
80 words
The process of claim 8 wherein said cadmium metal and cadmium oxide powder mixture is blended with water and an aqueous dispersion of about 50% by weight fluorocarbons in a ratio of about 2 parts by weight of said dispersion to 99 parts by weight powder mixture to form a slurry; said slurry is spread on a foraminous substrate; and said coated substrate is heated to a temperature not exceeding 200*F. to irreversibly break said dispersion without sintering said fluorocarbon.
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) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |