Additive for activating iron electrodes in alkaline batteries
AssigneeFirma Deutsche Automobilgesellschaft mbH
InventorsFriedrich Haschka, Gerhard Berger
Life of this patent
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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.
Claims15
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.
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.
Dependencies are inferred from the claim text.