Cathodes for metal air electrochemical cells
AssigneeThe Gillette Company
InventorsEdward Curelop, Sharon Lu, Stephen McDevitt, David Pappas, Joseph Sunstrom
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Abstract
A textured dual layer metal air cathode is disclosed. The cathode includes a first layer that contains 30% to 70% organic polymer by weight, a second layer that contains 10% to 30% organic polymer by weight, and a catalyst. The first layer and the second layer contact each other at a textured interface.
Claims26
A cathode for a metal air electrochemical cell, the cathode comprising:
- (a) a first layer including about 30% to about 70% of an organic polymer by weight;
- (b) a second layer including about 10% to about 30% of an organic polymer by weight;
- and
- (c) a catalyst,
- wherein the first layer and the second layer contact each other at a substantially continuous textured interface, and wherein the cathode includes a current collector that does not contact the interface.
A metal air electrochemical cell comprising:
- an anode including an anode can and an anode gel;
- a cathode, the cathode including a cathode can having at least one air access port and containing a cathode structure, the anode can and cathode can being assembled to form a cell;
- and
- a separator electronically separating the anode and the cathode positioned between the anode gel and the cathode structure;
- wherein the cathode structure comprises (a) a first layer including about 30% to about 70% of an organic polymer by weight;
- (b) a second layer including about 10% to about 30% of an organic polymer by weight;
- and (c) a catalyst, wherein the first layer and the second layer contact each other at a substantially continuous textured interface, and wherein the cathode includes a current collector that does not contact the interface.
A method of making an electrochemical cell, the method comprising
- combining carbon with AgMnO4 to form a mixture,
- reducing the AgMnO4 in the mixture to form MnO2,
- preparing a cathode with the MnO2, and
- introducing an aqueous electrolyte into the cell.
A cathode for a zinc air cell that has a current density of at least 70 mA/cm2 at a voltage of −0.25 volts, versus a Hg/HgO reference, wherein the cell has a zinc slurry anode, wherein the cathode includes two layers, each of the layers including an organic polymer and contacting each other at a textured interface, and wherein the cathode includes a current collector that does not contact the interface.
Dependencies are inferred from the claim text.