Abstract
We investigated the effects of morphology on the ion transport properties of polymer electrolytes. A single sulfonated block copolymer displayed a series of ordered morphologies with three-dimensional symmetry, i.e., cubic, Fddd (O70), and Fm3m (fcc) phases, upon the addition of ionic liquids. The unique phase behavior was understood on the basis of the selective swelling of the sulfonated blocks by ionic liquids and the changes in segregation strength with the modulation of the ionic interactions in the ionic phases. The type of three-dimensional lattice was revealed to play an important role in determining the ion transport properties of ionic liquid-containing sulfonated block copolymers. For example, the sample with disordered spherical lattices exhibited the highest tortuosity (∼2) for ion conduction, indicative of the considerable diffusion barriers in the conducting phases. On the contrary, the samples with well-defined orthorhombic and face-centered cubic symmetries, i.e., O70 and fcc phases, rev...
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