Bifunctional electrode for an electrochemical cell or a supercapacitor and a method of producing it
AssigneeSaft
InventorsXavier Andrieu, Laurence Josset
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Abstract
The present invention concerns an electrode for an electric cell or supercapacitor containing a non-aqueous liquid electrolyte, the electrode comprising an electronically conducting porous first layer including at least one first face covered with a microporous second layer constituted by a polymeric material, the electrode being characterized in that said second layer is produced by coagulation of said polymer from a solution of said polymer impregnating said first face.
Claims18
An electrochemical cell or supercapacitor containing a non-aqueous liquid electrolyte and an electrode, the electrode comprising an electrically conductive porous layer having at least one face covered by a microporous, coagulated polymeric layer, wherein said polymeric layer is intimately connected to said face and is produced by precipitation of said polymer using a non-solvent from a solution of said polymer impregnating said face.
A method of producing an electrode, comprising the following steps:
- (a) providing an electrically conductive porous layer;
- (b) coating said electrically conductive porous layer with a film of a solution of a polymer in a volatile solvent, the polymer is selected from:
- (A) poly(vinylidene fluoride), poly(vinyl chloride), poly(methyl methacrylate), cellulose acetate, a polysulfone, a polyether, a polyolefin, and copolymers thereof;
- or
- (B) an alloy of poly(vinylidene fluoride) with a polymer selected from a polysulfone, poly(methyl methacrylate) and poly(vinylpyrrolidone), and copolymers of poly(vinylidene fluoride) and poly(tetrafluoroethylene), of poly(vinylidene fluoride) and propylene hexafluoride, or of vinyl acetate and vinyl alcohol;
- (c) after coating step (b), bringing said film into contact with a volatile non-solvent which is miscible with said solvent, whereby an electrode is formed;
- (d) drying said electrode of step (c) to eliminate said solvent and said non-solvent.
Dependencies are inferred from the claim text.