The present disclosure provides composite ion exchange membranes and methods of making the same. The composite ion exchange membranes of the present disclosure include a first layer comprising a first ion-conducting membrane; a second layer comprising a gas-blocking membrane; and a third layer comprising a second ion-conducting membrane.

An anion exchange membrane is made by mixing 2 trifluoroMethyl Ketone [nominal] (1.12 g, 4.53 mmol), 1 BiPhenyl (0.70 g, 4.53 mmol), methylene chloride (3.0 mL), trifluoromethanesulfonic acid (TFSA) (3.0 mL) to produce a pre-polymer. The pre-polymer is then functionalized to produce an anion exchange polymer. The pre-polymer may be functionalized with trimethylamamine in solution with water. The pre-polymer may be imbibed into a porous scaffold material, such as expanded polytetrafluoroethylene to produce a composite anion exchange membrane.

Disclosed is an electrolyte membrane for a membrane-electrode assembly, which may include a filler that is a polymer compound (oligomer) having a low molecular weight. The electrolyte membrane may suitably include an oligomeric poly(vinylpyrrolidone) compound including a sulfonic acid group. The electrolyte membrane for a membrane-electrode assembly may have improved proton conductivity.

Disclosed is a method for manufacturing a separator. The method includes (S1) preparing a porous planar substrate having a plurality of pores, (S2) preparing a slurry containing inorganic particles dispersed therein and a polymer solution including a first binder polymer and a second binder polymer in a solvent, and coating the slurry on at least one surface of the porous substrate, (S3) spraying a non-solvent incapable of dissolving the second binder polymer on the slurry, and (S4) simultaneously removing the solvent and the non-solvent by drying. According to the method, a separator with good bindability to electrodes can be manufactured in an easy manner. In addition, problems associated with the separation of inorganic particles in the course of manufacturing an electrochemical device can be avoided.

The ion exchange membrane according to the present invention comprises a layer A comprising a fluorine-containing polymer having a sulfonic acid group and a layer B comprising a fluorine-containing polymer having a carboxylic acid group, wherein a ratio of an ion cluster diameter of the layer B after electrolysis under the following electrolysis conditions to the ion cluster diameter of the layer B before the electrolysis [(the ion cluster diameter of the layer B after the electrolysis)/(the ion cluster diameter of the layer B before the electrolysis)] is 0.83 to 0.95:

(Electrolysis Conditions)

in a zero-gap base electrolytic cell where the ion exchange membrane is disposed between an anode chamber to which a 3.5 N aqueous sodium chloride solution is supplied and a cathode chamber to which a 10.8 N aqueous sodium hydroxide solution is supplied, electrolysis is performed for 7 days under conditions having a temperature of 85 C. and a current density of 6 kA/m.sup.2.

The invention pertains to a process for manufacturing certain (per)fluoroionomer liquid compositions, comprising, inter alia, at least one of fluorination and treatment with a polar solvent, to the liquid compositions therefrom having an improved solids content/surface tension/liquid viscosity compromise, to the use of the same for manufacturing composite membranes and to composite membranes obtainable therefrom.

The present disclosure provides composite ion exchange membranes and methods of making the same. The composite ion exchange membranes of the present disclosure include a first layer comprising a first ion-conducting membrane; a second layer comprising a gas-blocking membrane; and a third layer comprising a second ion-conducting membrane.

An anion exchange membrane is made by mixing 2 trifluoroMethyl Ketone [nominal] (1.12 g, 4.53 mmol), 1 BiPhenyl (0.70 g, 4.53 mmol), methylene chloride (3.0 mL), trifluoromethanesulfonic acid (TFSA) (3.0 mL) to produce a pre-polymer. The pre-polymer is then functionalized to produce an anion exchange polymer. The pre-polymer may be functionalized with trimethylamamine in solution with water. The pre-polymer may be imbibed into a porous scaffold material, such as expanded polytetrafluoroethylene to produce a composite anion exchange membrane.

The present invention relates to: an ion exchange membrane containing, in a channel, an inorganic particle, substituted with an organic compound including SO.sub.4.sup. group; and a method for manufacturing the ion exchange membrane. The ion exchange membrane according to the present invention can provide excellent physical properties while also maintaining ion conductivity.

A composite structure comprising a layer of zeolite having a high silica to alumina ratio supported on a support layer acts as a separator in a redox flow battery. The zeolite can be either supported on a rigid substrate, such as alumina, or a flexible substrate, such as a polymeric film. The polymeric film, in particular, can be an ion exchange membrane such as Nafion. The zeolite layer with a high silica to aluminum ratio provides a long-lasting separator for redox flow batteries.