US4250236A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Additive for activating iron electrodes in alkaline batteries
Assignee: Deutsche Automobil GmbH
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Filing: 1979-08-30
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Granted: 1981-02-10
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Expires: 1999-08-30
Abstract
Abstract An additive for the iron electrodes of alkaline batteries which prevents and counteracts the tendency of iron electrodes to become passive and ineffective. The additive consists of sulfide, selenide or telluride which is sparingly soluble in the electrolyte and has a decomposition potential more electronegative than the final charging potential of the iron electrode. The additive may be placed in the active electrode material during manufacture but may also be placed in the battery during or after manufacture, for example in tablet form. The additive may also be introduced in a manner permitting subsequent activation by electrochemical methods. A number of examples is presented.
Inventors
- 👤 Friedrich Haschka
- 👤 Gerhard Berger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:18
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/64; H01M4/70; H01M4/72; H01M4/74; H01M4/745; H01M10/00; H01M10/24; H01M10/26; H01M4/24; H01M4/248; H01M4/36; H01M4/362; H01M4/364; H01M4/80; H01M4/806; H01M4/04; H01M4/043; H01M4/0471; H01M4/62; H01M4/624; H01M4/625; H01M4/76; H01M4/762; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
77 words
An alkaline battery containing an iron electrode and an activating additive for said iron electrode, said additive comprising at least one substance from the class consisting of sulfide, telluride and selenide, said substance being sparingly soluble in the electrolyte of the battery and having a decomposition potential which is more negative than the final charging potential of the iron electrode, and said additive being placed in said battery separately from the active mass of the iron electrode.
Claim 2
Dependent Claim
77 words
An alkaline battery containing an iron electrode and an activating additive for said iron electrode, said additive comprising at least one substance from the class consisting of sulfide, telluride and selenide, said substance being sparingly soluble in the electrolyte of the battery and having a decomposition potential which is more negative than the final charging potential of the iron electrode, and said additive being placed in said battery separately from the active mass of the iron electrode.
Claim 3
Dependent Claim
73 words
An alkaline battery containing an iron electrode and an activating additive for said iron electrode, said additive comprising at least one substance from the class consisting of sulfide, telluride and selenide, said substance being sparingly soluble in the electrolyte of the battery and having a decomposition potential which is more negative than the final charging potential of the iron electrode, and said additive being placed in the active mass of the iron electrode.
Claim 4
Dependent Claim
73 words
An alkaline battery containing an iron electrode and an activating additive for said iron electrode, said additive comprising at least one substance from the class consisting of sulfide, telluride and selenide, said substance being sparingly soluble in the electrolyte of the battery and having a decomposition potential which is more negative than the final charging potential of the iron electrode, and said additive being placed in the active mass of the iron electrode.
Claim 5
Dependent Claim
25 words
An alkaline battery in accordance with claim 2, wherein said additive is formed by chemical or electrochemical reaction in the active mass of the electrode.
Claim 6
Dependent Claim
21 words
An alkaline battery in accordance with claim 1, wherein said additive is formed by chemical or electrochemical reaction within the electrolyte.
Claim 7
Dependent Claim
19 words
An alkaline battery in accordance with claim 1, wherein said additive is placed in the battery before battery assembly.
Claim 8
Dependent Claim
19 words
An alkaline battery in accordance with claim 1, wherein said additive is placed in the battery after battery assembly.
Claim 9
Dependent Claim
26 words
An alkaline battery according to claim 1 or 2, wherein the solubility of said activating additive is at most 10 -2 Mol/l up to 70° C.
Claim 10
Dependent Claim
34 words
An alkaline battery according to claim 1 or 2, wherein said activating additive consists at least partially of one or more substances from the group consisting of zinc sulfide, manganese sulfide and lanthanum sulfide.
Claim 11
Dependent Claim
26 words
An alkaline battery according to claim 1 or 2, wherein said activating additive constitutes 0.01-20% of the weight of the active mass of said iron electrode.
Claim 12
Dependent Claim
26 words
An alkaline battery according to claim 1 or 2, wherein said activating additive constitutes 1-5% of the weight of the active mass of said iron electrode.
Claim 13
Dependent Claim
19 words
An alkaline battery according to claim 1 or 2, wherein said activating additive is present therein in powder form.
Claim 14
Dependent Claim
21 words
An alkaline battery according to claim 1 or 2, wherein said activating additive is present therein as pressed and formed powder.
Claim 15
Dependent Claim
19 words
An alkaline battery according to claim 1 or 2, wherein said activating additive is present therein as a paste.
Claim 16
Dependent Claim
27 words
An alkaline battery according to claim 1 or 2, wherein said activating additive is present therein as a suspension with particles having diameters smaller than 100 μm.
Claim 17
Dependent Claim
28 words
An alkaline battery according to claim 1 or 2, wherein said activating additive is present therein as a suspension with particles having diameters between 1 and 10 μm.
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) | 1984-02-10 | 1984-08-11 | 1985-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-10 | 1988-08-11 | 1989-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-10 | 1992-08-11 | 1993-02-10 | $7700.00 | Window Closed / Lapsed |