Metal-air cathode and cell having catalytically active manganese compounds of valence state +2
AssigneeRayovac Corporation
InventorsJoseph L. Passaniti, Robert B. Dopp
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Abstract
An air cathode for a metal-air cell and methods for making it are provided. In the air cathode of the present invention, manganese compounds of valence state +2 act as catalysts for the reduction of oxygen, and are distributed substantially evenly throughout a carbon matrix. Manganese compounds of valence state +2 form between carbon particles after the carbon particles are added to an aqueous solution of potassium permanganate.
Claims57
An electrochemical cathode for a metal-air cell having a metal anode, comprising:
- (a) a current collecting substrate capable of being connected to electrical circuitry;
- (b) an active layer comprising an admixture of carbon and manganese compounds, the manganese compounds being substantially all of valence state +2, the active layer and current collecting substrate forming a current collecting sublaminate, the sublaminate having first and second sides;
- (c) a barrier layer disposed on the first side of the current collecting sublaminate, and
- (d) an air diffusion layer disposed on the second side of the current collecting sublaminate.
A metal-air electrochemical cell, comprising:
- (a) a metal anode;
- (b) an electrolyte, and
- (c) an air cathode comprising an admixture of carbon particles and manganese compound particles, the manganese compounds being substantially all of valence state +2, the carbon particles and manganese compound particles forming an active layer, the active layer being disposed upon a current collecting substrate capable of being connected to electrical circuitry, the active layer and current collecting substrate forming a current collecting sublaminate, the sublaminate having first and second sides, a barrier layer being disposed on the first side of the sublaminate, and an air diffusion layer being disposed on the second side.
An electrochemical cathode material comprising, as chemically reactive components thereof, carbon and manganese compounds substantially all of valence state +2.
An electrochemical cathode material comprising, as electrochemically reactive components thereof, carbon and manganese compounds substantially all of valence state +2.
A composition of matter, comprising:
- (a) carbon, and
- (b) manganese compounds substantially all of valence state +2,
- wherein the carbon and manganese compounds are separate components in admixture, and the composition of matter is suitable for use in the cathode of the metal-air cell having a metal anode.
A composition of matter, consisting essentially of:
- (a) carbon, and
- (b) manganese compounds substantially all of valence state +2,
- wherein the carbon and manganese compounds are separate components in admixture, and the composition of matter is suitable for use in the cathode of the metal-air cell having a metal anode.
A composition of matter, consisting of:
- (a) carbon, and
- (b) manganese compounds substantially all of valence state +2,
- wherein the carbon and manganese compounds are separate components in admixture, and the composition of matter is suitable for use in the cathode of the metal-air cell having a metal anode.
Dependencies are inferred from the claim text.