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Recombination of evolved oxygen in galvanic cells using transfer anode material
| Details |
Inventors: Tomantschger, Klaus; Kordesch, Karl; Oran, Erkut;
Assignee: Battery Technologies Inc. (Mississauga, CA)
Primary Examiner: Walton; Donald L.
Assistant Examiner:
Attorney, Agent or Firm: Hewson; Donald E.
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. |
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DETAILED DESCRIPTION What we claim is: 1.
A rechargeable electrochemical cell having a metal oxide cathode, metal anodic material, a current collector in intimate physical association with said anodic material, a separator between the anodic material and the cathode, and an aqueous alkaline electrolyte contacting said anodic material, said separator, and said cathode.
, in which cell oxygen may evolve on charge, overcharge, or any reversal of cell polarity; said cell including transfer anode material in electronic and ionic contact with said anodic material, said transfer anode material being porous and at least partially wetted by said electrolyte so as to thereby establish said ionic contact with said anodic material; said transfer anode material having a catalytic material which acts to promote accelerated consumption of any oxygen gas present within said cell by the anodic material of said cell; said transfer anode material and said current collector being in intimate physical association so as to thereby establish said electronic contact between said transfer anode material and said anodic material; whereby oxygen evolved within said cell is recombined by said transfer anode material.
2.
The rechargeable electrochemical cell of claim 1, where said anodic material is chosen from the group consisting of metal hydrides and zinc.
3.
The rechargeable electrochemical cell of claim 2, where said anodic material is zinc.
4.
The rechargeable electrochemical cell of claim 3, where said current collector is a rectangular plate, and said anodic material and said transfer anode material are in intimate physical contact therewith and are PTFE bonded thereto.
5.
The rechargeable electrochemical cell of claim 4, where said catalytic material is chosen from the group consisting of graphite particles, Cu particles, Cu powder, Ni particles, Ni powder, Ag particles, Ag powder, Cd particles, Cd powder, and metal-plated zinc particles where said metal is chosen from the group consisting of Cu, Ag and Cd.
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Fuel Cells 
