US4415636A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Secondary batteries having a zinc negative electrode
Assignee: Evercel Inc
•
Filing: 1981-05-07
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Granted: 1983-11-15
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Expires: 2001-05-07
Abstract
Abstract Batteries having a positive electrode and a negative electrode containing zinc and cadmium matter. The cadmium matter is an additive enhancing adherence of the negative electrode for zinc electroreduced from solid zinc compound state or deposited thereon from electrolytes. The zinc matter and the active material of the positive electrode are employed in quantities such that the cadmium matter is maintained electrochemically inactive with respect to the active material of the positive electrode in battery discharging.
Inventors
- 👤 Allen Charkey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:31
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/24; H01M4/244; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
134 words
A battery having a positive electrode including active material and a negative electrode including zinc material and cadmium particulate matter dispersed in said zinc material, said battery being constructed with such positive electrode active material and said zinc material in quantities such that said positive electrode active material is electrochemically depleted prior to electrochemical depletion of said zinc material in discharging of said battery, whereby said cadmium particulate matter is electrochemically inactive with respect to said positive electrode active material in such battery discharging, said negative electrode including: an electrically conductive support, a first layer overlying said conductive support and comprised of said cadmium particulate matter and a first binder therefor and a second layer overlying said first layer and comprised of said zinc material, said cadmium particulate matter and a second binder therefor.
Claim 2
Dependent Claim
134 words
A battery having a positive electrode including active material and a negative electrode including zinc material and cadmium particulate matter dispersed in said zinc material, said battery being constructed with such positive electrode active material and said zinc material in quantities such that said positive electrode active material is electrochemically depleted prior to electrochemical depletion of said zinc material in discharging of said battery, whereby said cadmium particulate matter is electrochemically inactive with respect to said positive electrode active material in such battery discharging, said negative electrode including: an electrically conductive support, a first layer overlying said conductive support and comprised of said cadmium particulate matter and a first binder therefor and a second layer overlying said first layer and comprised of said zinc material, said cadmium particulate matter and a second binder therefor.
Claim 3
Dependent Claim
15 words
The battery claimed in claim 1 wherein said positive electrode active material is silver matter.
Claim 4
Dependent Claim
15 words
The battery claimed in claim 1 wherein said positive electrode active material is nickel matter.
Claim 5
Dependent Claim
14 words
The battery claimed in claim 1 wherein said positive electrode is an oxygen electrode.
Claim 6
Dependent Claim
81 words
The battery claimed in claim 1 wherein said cadmium particulate matter is selected from the group consisting of (a) metallic cadmium having particle size of not greater than 10 microns and surface area not less than 1.0 square meters per gram, (b) a cadmium compound electrochemically convertible to metallic cadmium having particle size of not greater than 10 microns and surface area not less than 1.0 square meters per gram and (c) mixtures of said metallic cadmium and said cadmium compound.
Claim 7
Dependent Claim
14 words
The battery claimed in claim 1 wherein said particulate cadmium matter is cadmium oxide.
Claim 8
Dependent Claim
13 words
The battery claimed in claim 6 wherein said zinc material is zinc oxide.
Claim 9
Dependent Claim
18 words
The battery claimed in claim 7 further including a binder for said cadmium oxide and said zinc oxide.
Claim 10
Dependent Claim
14 words
The battery claimed in claim 1 wherein said particulate cadmium matter is cadmium hydroxide.
Claim 11
Dependent Claim
14 words
The battery claimed in claim 1 wherein said first and second binders comprise polytetrafluoroethylene.
Claim 12
Dependent Claim
28 words
The battery claimed in claim 1 wherein the weight of said particulate cadmium matter therein is from 1.0 to 10 percent of the weight of said zinc material.
Claim 13
Dependent Claim
14 words
The battery claimed in claim 1 wherein said particulate cadmium matter is cadmium sulfate.
References Cited (Backward Citations)
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Cited
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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) | 1986-11-14 | 1987-05-16 | 1987-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-14 | 1991-05-16 | 1991-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-14 | 1995-05-16 | 1995-11-15 | $7700.00 | Window Closed / Lapsed |