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Enhanced Li-Ion Transport through Selectively Solvated Ionic Layers of Single-Ion Conducting Multiblock Copolymers

Enhanced Li-Ion Transport through Selectively Solvated Ionic Layers of Single-Ion Conducting Multiblock Copolymers

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PARK, Jinseok, Anne STAIGER, Stefan MECKING, Karen I. WINEY, 2022. Enhanced Li-Ion Transport through Selectively Solvated Ionic Layers of Single-Ion Conducting Multiblock Copolymers. In: ACS Macro Letters. ACS Publications. 11(8), pp. 1008-1013. eISSN 2161-1653. Available under: doi: 10.1021/acsmacrolett.2c00288

@article{Park2022Enhan-58437, title={Enhanced Li-Ion Transport through Selectively Solvated Ionic Layers of Single-Ion Conducting Multiblock Copolymers}, year={2022}, doi={10.1021/acsmacrolett.2c00288}, number={8}, volume={11}, journal={ACS Macro Letters}, pages={1008--1013}, author={Park, Jinseok and Staiger, Anne and Mecking, Stefan and Winey, Karen I.} }

Enhanced Li-Ion Transport through Selectively Solvated Ionic Layers of Single-Ion Conducting Multiblock Copolymers 2022 Staiger, Anne Park, Jinseok Mecking, Stefan Mecking, Stefan 2022-08-30T14:53:17Z Staiger, Anne We demonstrate enhanced Li<sup>+</sup> transport through the selectively solvated ionic layers of a single-ion conducting polymer. The polymer is a precisely segmented ion-containing multiblock copolymers with well-defined Li<sup>+</sup>SO<sub>3</sub><sup>–</sup> ionic layers between crystallized linear aliphatic 18-carbon blocks. X-ray scattering reveals that the dimethyl sulfoxide (DMSO) molecules selectively solvate the ionic layers without disrupting the crystallization of the polymer backbone. The amount of DMSO (∼21 wt %) calculated from the increased layer spacing is consistent with thermogravimetric analysis. The ionic conductivity through DMSO-solvated ionic layers is >10<sup>4</sup> times higher than in the dried state, indicating a significant enhancement of ion transport in the presence of this solvent. Dielectric relaxation spectroscopy (DRS) further elucidates the role of the structural relaxation time (τ) and the number of free Li<sup>+</sup> (n) on the ionic conductivity (σ). Specifically, DRS reveals that the solvation of ionic domains with DMSO contributes to both accelerating the structural relaxation and the dissociation of ion pairs. This study is the initial demonstration that selective solvation is a viable design strategy to improve ionic conductivity in nanophase separated, single-ion conducting multiblock copolymers. Park, Jinseok Winey, Karen I. eng terms-of-use 2022-08-30T14:53:17Z Winey, Karen I.

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