Partial Solvation of Lithium Ions Enhances Conductivity in a Nanophase-Separated Polymer Electrolyte

Vigil, Daniel Lee; Ferko, Benjamin T.; Saumer, Anne; Mecking, Stefan; Stevens, Mark J.; Winey, Karen I.; Frischknecht, Amalie L.

doi:10.1021/acs.chemmater.4c02398

Title: Partial Solvation of Lithium Ions Enhances Conductivity in a Nanophase-Separated Polymer Electrolyte

Journal Article · 28 September 2024 · Chemistry of Materials

DOI: https://doi.org/10.1021/acs.chemmater.4c02398 · OSTI ID:2472749

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Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Center for Integrated Nanotechnologies
Univ. of Pennsylvania, Philadelphia, PA (United States)
University of Konstanz (Germany)

In this study, we demonstrate that a multiblock lithium-ion-conducting polymer can be swollen with ethylene carbonate solvent to increase the conductivity relative to the dry polymer material by nearly 4 orders of magnitude. This increase is due to the partial solvation of lithium ions by ethylene carbonate, which leads to Li⁺ diffusion along the solvent–polymer interface. This differs from the vehicular transport mechanism for lithium ions in pure solvent. We use a combination of broadband dielectric spectroscopy, X-ray scattering, and all-atom molecular dynamics simulations to probe the effect of the solvent on the polymer morphology and to elucidate the mechanism of lithium ion transport.

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Research Organization:: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Center for Integrated Nanotechnologies

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF)

Grant/Contract Number:: NA0003525

OSTI ID:: 2472749

Report Number(s):: SAND--2024-13798J

Journal Information:: Chemistry of Materials, Journal Name: Chemistry of Materials Journal Issue: 19 Vol. 36; ISSN 0897-4756

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Partial Solvation of Lithium Ions Enhances Conductivity in a Nanophase-Separated Polymer Electrolyte

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