Duracell Inc.

Duracell International Inc.

Frank E Parsen

Chih-Chung Wang

Purush Chalilpoyil

Teresita O Graham

Eleanor J Rossler

Jesse R Rea

Thomas T Yatabe

Corrosion is reduced in aqueous electrochemical cells having zinc anodes comprised of single crystal zinc particles by the addition of small amounts of a gas inhibiting surfactant, for example, an organic phosphate inhibitor such as RA600 from GAF Corp. to the cell. A synergistically lowered rate of corrosion and cell gassing is obtained even with reduction of mercury content.

Cell corrosion reduction

Corrosion is reduced in aqueous electrochemical cells having zinc anodes by utilizing mercury amalgamated discrete single crystal zinc particles to which small amounts of one or more of indium, thallium, gallium, bismuth, cadmium, tin and lead have been added or prealloyed with the zinc, prior to formation of the single crystal particles. A synergistically lowered rate of corrosion and cell gassing is obtained even with reduction of mercury content.

Corrosion and hydrogen evolution in a current-producing cell possessing a predominantly zinc anode and an aqueous alkaline or acidic electrolyte is significantly inhibited by the addition to said cell of a zinc corrosion and hydrogen evolution-inhibiting amount of at least one chelating agent selected from the group consisting of aminocarboxylic acid, polyamine and aminoalcohol.

Corrosion and hydrogen evolution inhibitors for current-producing cells

An agent which absorbs hydrogen gas for electrochemical cells is made from an oxide of manganese and nickel, cobalt or iron. At temperatures above about 40.degree. C., the oxide of manganese can be replaced by lead oxide. Hydrophobic binders can be added to the agent or the agent can be microencapsulated in water-impermeable but hydrogen-gas-permeable materials. The agent is preferably added to the cell in the form of small agglomerates or microcapsules.

Electrochemical cells having hydrogen gas absorbing agent

A method for forming a gelled anode in which a powdered anode metal is mixed with means for maintaining a uniform mixture of the powdered metal and a gelling agent, the gelling agent is added, and the mixture is fed into an aqueous electrolyte in the cell whereupon a gel is formed in situ.

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Weston, MA, United States of America

Frank E Parsen