Varta Batterie Aktiengesellschaft

Gerhard Schneider

Helmut Laig-Horstebrock

Werner Riedl

Hans-Martin Lippold

In connection with a metal oxide electrode in an alkaline electrolyte system, especially for a brownstone electrode, the presence of cobalt as a thin film or as an alloying consitituent at the surface of the positive current drain wire, which is preferably a nickel-plated steel cup or a deep-drawing steel plate, leads to a reduction of the contact resistance between the current drain wire and the MnO.sub.2. To apply the cobalt, the current drain wire is preferably polarized in an aqueous CoSO.sub.4 solution. The cobalt film, which is formed in a thickness of less than 1 micron (depending on the Co ion concentration and the selected current conditions), imparts resistance properties to the transition between the MnO.sub.2 and the nickel-plated current drain wire even after prolonged storage, which can otherwise only be achieved with gold-plated current drain wires.

Current conductor for a metal oxide electrode in an alkaline electrolyte

An electrode for a primary cell is produced by first mixing a solid depolarizer, carbon, and a water-insoluble organic polymer binder. The mixture is then molded into an electrode body. The binder is in the mixture in the form of a dispersion in a hydrophilic medium.

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Ellwangen, Germany

Gerhard Schneider