Ion transport properties of self-assembled block copolymer electrolytes with tunable ion distribution within.
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초록
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As potential candidates for future solid-state polymer electrolytes, block copolymers comprising various ionic liquids has been extensively studied. It has been directed to improve ionic conductivity and mechanical properties of the composite membranes. In the present study, we investigate a new method to improve ion transport properties of ionic liquid-containing block copolymers by tuning the ion distribution within microphase separated morphology. The variation of the type of anion in ionic liquids resulted in dissimilar swelling behavior of ionophilic domains and dissimilar interfacial properties of ionophilic/ionophobic phases, By combining spectroscopic techniques, it has been revealed that the anion plays a key role in determining the distribution of ions in nanostructures of block copolymers. Especially, by introducing mixed ionic liquids, remarkable enhancement in ionic conductivity was achieved owing to the creation of sacrificial interfaces of ionophobic/ionophilc domains.