Electrolytic membrane, method of manufacturing it and use

C - Chemistry – Metallurgy – 08 – J

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C08J 5/22 (2006.01)

Patent

CA 2270595

Electrolytic membrane comprising an ion-conducting polymer which is fixed in the pores of a porous polyalkene membrane stretched in at least one direction, wherein the polyalkene membrane has a porosity of 30-90 % and a mean pore diameter of 0.1 to 5.0 µm. The elctrolytic membrane can be manufactured by impregnating the polyalkene with a suitable solution of the ion-conducting polymer at a temperature which is at least 80 °C, preferably at least 110 °C, and which is not above the melting point of the polyalkene membrane used. The electrolytic membrane is very suitable for use in solid-polymer fuel cells and batteries.

L'invention porte sur une membrane électrolytique faite d'un polymère conducteur d'ions fixé dans les pores d'une membrane poreuse de polyalkylène étirée dans au moins un sens et présentant une porosité comprise entre 30 et 90 % et un diamètre moyen de pores de 0,1 à 5,0 mu m. La membrane électrolytique peut s'obtenir par imprégnation du polyalkylène à l'aide d'une solution appropriée d'un polymère conducteur d'ions à une température d'au moins 80 DEG C, et de préférence d'au moins 110 DEG C, mais ne dépassant pas le point de fusion de la membrane de polyalkylène utilisée. Cette membrane électrolytique présente une grande utilité pour les piles à combustible et batteries à polymères solides.

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