Role of solvation site segmental dynamics on ion transport in ethylene-oxide based side-chain polymer electrolytes

Bennington, Peter; Deng, Chuting; Sharon, Daniel; Webb, Michael A.; de Pablo, Juan J.; Nealey, Paul F.; Patel, Shrayesh N.

doi:10.1039/d1ta00899d

Title: Role of solvation site segmental dynamics on ion transport in ethylene-oxide based side-chain polymer electrolytes

Journal Article · Mon Apr 12 00:00:00 EDT 2021 · Journal of Materials Chemistry. A

DOI:https://doi.org/10.1039/d1ta00899d· OSTI ID:1821196

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Univ. of Chicago, IL (United States)
Hebrew Univ. of Jerusalem (Israel). Inst. of Chemistry
Princeton Univ., NJ (United States)
Univ. of Chicago, IL (United States); Argonne National Lab. (ANL), Lemont, IL (United States)

Ion conducting capability is often imparted to polymeric materials through short polyether side-chains, and yet the impact of this graft polymer architecture on ion solvation and conduction has not been fully explored. Here, we use a combination of impedance spectroscopy, vibrational spectroscopy, and atomistic molecular dynamics (MD) to compare the conductivity, ionic interactions, and polymer dynamics in a series of graft polyether electrolytes. We find that in poly[(oligo ethylene oxide)methyl ether methacrylate] (POEM), a widely used graft polymer electrolyte, the ionic conductivity drops more than an order of magnitude as the side-chain length is decreased from nine ethylene oxide (EO) units to three. This difference in conductivity is unexplained by differences in the calorimetric glass transition temperature (T_g), which varies only slightly with side-chain length. Furthermore, through vibrational spectroscopy and MD simulations we demonstrate that both linear and graft polyethers solvate Li⁺ ions effectively and dissociate them from large counterions, irrespective of side-chain length. Li⁺ ions do, however, show preferential solvation by EO units far from the methacrylate backbone. Similarly, EO units far from the backbone show enhanced segmental dynamics, while those near the immobile methacrylate group move substantially more slowly, as quantified by bond vector autocorrelation relaxation times. This heterogeneity in both ion solvation and local segmental relaxation explains variation in ion conductivity where material-averaged properties such as T_g and number of free ions fail to do so. Importantly, the ionic conductivity is dictated primarily by the segmental mobility of the EO units which form effective solvation sites, rather than system-wide dynamics.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)

Grant/Contract Number:: AC02-06CH11357; ECCS-1542205; DMR-1420709

OSTI ID:: 1821196

Alternate ID(s):: OSTI ID: 1776386

Journal Information:: Journal of Materials Chemistry. A, Vol. 9, Issue 15; ISSN 2050-7488

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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