Varta Batterie Aktiengesellschaft

Winfried Krey

Helmut Laig-Horstebrock

Alkaline MnO.sub.2 /Zn cells having nickel-plated steel cups as the cathode collector show deterioration of their discharge characteristics after high-temperature storage, which can be prevented by an additive in the cathode paste which forms a strong complex with nickel. Nickel oxide layers of high ohmic resistance, which are the cause of the contact resistance between the cathode and the nickel coating of the steel cup, are accordingly dissolved or transformed. Imidazole, 2-picolinic acid, dimenthylglyoxime, 4,5-dihydroxbenzene-1,3-disulfonic acid and 1,10-phenanthroline are particularly effective additives for compounding into the cathode. Preferred amounts are between 0.001 wt. % and 1 wt. %.

Electrochemical cell

A depolarizer mass for galvanic cells includes, in addition to the conventional ingredients, a hydrophobic agent. This agent is introduced by addition to the electrolyte, or by impregnation of the solid ingredients.

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Munich, Georgia

Winfried Krey