Block copolymer electrolyte composite membranes and methods of producing the same

A method of producing a penta-block copolymer electrolyte composite membrane consisting of poly((t-butyl-styrene)-b-(ethylene-r-propylene)-b-(styrene-r-styrene sulfonate)-b-(ethylene-r-propylene)-b-(t-butyl-styrene)), which comprises the steps of:

• surface-modifying a platelet inorganic filler with a sulfonic group;
• adding and dispersing the platelet inorganic fillers as surface-modified in an electrolyte solution of a block copolymer comprising at least one selected from the group consisting of a sulfonic group, a carbonic acid group, and a phosphoric acid group;
• and
• drying the electrolyte solution to create the penta-block copolymer consisting of poly((t-butyl-styrene)-b-(ethylene-r-propylene)-b-(styrene-r-styrene sulfonate)-b-(ethylene-r-propylene)-b-(t-butyl-styrene)).

A method of producing a penta-block copolymer electrolyte composite membrane consisting of poly((t-butyl-styrene)-b-(ethylene-r-propylene)-b-(styrene-r-styrene sulfonate)-b-(ethylene-r-propylene)-b-(t-butyl-styrene)), which comprises the steps of:

• surface-modifying a platelet inorganic filler with a sulfonic group, wherein the platelet inorganic filler is laponite or saponite;
• adding and dispersing the platelet inorganic fillers as surface-modified in an electrolyte solution of a penta-block copolymer comprising at least one selected from the group consisting of a sulfonic group, a carbonic acid group, and a phosphoric acid group;
• drying the electrolyte solution to obtain a composite membrane;
• eliminating bubbles in the composite membrane;
• casting the composite membrane using a bar coater and controlling the thickness of the composite membrane;
• drying the composite membrane;
• annealing the composite membrane;
• immersing the composite membrane in HCl and distilled water,
• wherein the penta-block copolymer electrolyte composite membrane consisting of poly((t-butyl-styrene)-b-(ethylene-r-propylene)-b-(styrene-r-styrene sulfonate)-b-(ethylene-r-propylene)-b-(t-butyl-styrene)) is formed.