Recombination of evolved oxygen in galvanic cells using transfer

Details Recombination of evolved oxygen in galvanic cells using transfer Recombination of evolved oxygen in galvanic cells using transfer

1990-02-12

1991-08-27

Walton, Donald L.

Chemistry: electrical current producing apparatus, product, and

Sealed cell having gas prevention or elimation means

Prevention or elimination means is one of the cell...

429229, H01M 1052

Patent

active

050432346

ABSTRACT:
In rechargeable, electrochemical cells, oxygen may evolve on charge, overcharge or any reversal of polarity. The invention concerns an auxiliary, electrochemical, transfer electrode to catalyze the recombination of such oxygen with the anode mass. The auxiliary electrode may comprise a porous carbon bonded with PTFE, or it may comprise a zinc gel having graphite particles and/or metal-plated zinc particles--where the metal that plates the zinc particles may be copper, or may be any of cobalt, cadmium, nickel, or silver. The auxiliary electrode for rectangular electrodes as used in flat plate or jelly roll cells may have the catalytically active material PTFE bonded to the current collector. The cell is generally one having a zinc anode, a metal oxide cathode (usually manganese dioxide), and an aqueous alkaline electrolyte (usually potassium hydroxide) contacting both anode and cathode.

REFERENCES:
patent: 3350225 (1967-10-01), Seiger
patent: 3438812 (1965-08-01), Cherney et al.
patent: 3536537 (1964-12-01), Solomon
patent: 4091178 (1978-05-01), Kordesch
patent: 4246326 (1981-01-01), Sprengel et al.

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