Bifunctional air electrode
AssigneeReVolt Technology Ltd.
InventorTrygve Burchardt
Life of this patent
Estimating the term…
Abstract
Air electrodes for secondary metal-air batteries or secondary metal hydride-air batteries, in particular, bifunctional air electrodes that can undergo oxygen reduction and oxygen evolution with high reaction rates. A method of manufacturing such electrodes.
Claims15
A bifunctional air electrode for a secondary metal-air battery comprising a gas diffusion layer, an active layer, an oxygen evolution layer and a current collector in electrical contact with the active layer;
- wherein the active layer contains an oxygen reduction catalyst and a bifunctional catalyst which is selected from La2O3, Ag2O and spinels.
A secondary battery comprising either a metal electrode or a metal hydride electrode, and an air electrode, wherein the air electrode is a bifunctional electrode comprising a gas diffusion layer, an active layer, an oxygen evolution layer and a current collector in electrical contact with the active layer;
- wherein the active layer contains an oxygen reduction catalyst and a bifunctional catalyst.
A method for manufacturing a bifunctional air electrode comprising:
- a) forming an active layer by:
- (i) mixing a pore forming material, a binding material, an oxygen reduction catalyst and a bifunctional catalyst to produce an agglomerate;
- (ii) adding an organic solvent to the dry agglomerate to produce a paste;
- (iii) calendering the paste into a thin sheet to form an active layer;
- b) forming a gas diffusion layer by:
- (i) mixing a pore forming material and a binding material to produce an agglomerate;
- (ii) adding an organic solvent to the dry agglomerate to produce a paste;
- (iii) calendering the paste into a thin sheet to form a gas diffusion layer;
- c) combining said active layer and said gas diffusion layer;
- d) pressing a current collector into either of the layers to form the gas diffusion electrode.
Dependencies are inferred from the claim text.