Role of Fast Dynamics in Conductivity of Polymerized Ionic Liquids

Bocharova, Vera; Genix, Anne-Caroline; Kisliuk Estate, Alexander; Sala, Gabriele; Osti, Naresh C.; Mamontov, Eugene; Sokolov, Alexei P.

doi:10.1021/acs.jpcb.0c07549

Title: Role of Fast Dynamics in Conductivity of Polymerized Ionic Liquids

Journal Article · Sat Nov 07 00:00:00 EST 2020 · Journal of Physical Chemistry. B, Condensed Matter, Materials, Surfaces, Interfaces and Biophysical Chemistry

DOI:https://doi.org/10.1021/acs.jpcb.0c07549· OSTI ID:1755297

^[1]; Genix, Anne-Caroline ^[2]; Kisliuk Estate, Alexander ^[1];

^[1];

^[3]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Montpellier (France)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)

Polymerized ionic liquids (PolyILs) are promising candidates for a broad range of technologies. However, the relatively low conductivity of PolyILs at room temperature has strongly limited their applications. In this work, we provide new insights into the roles of various microscopic parameters controlling ion transport in these polymers, which are crucial for their rational design and practical applications. Using broadband dielectric spectroscopy and neutron and light scattering techniques, we found a clear connection between the activation energy for conductivity, fast dynamics, and high-frequency shear modulus in PolyILs at their glass transition temperature (T_g). In particular, our analysis reveals a correlation between conductivity and the amplitude of fast picosecond fluctuations at T_g, suggesting the possible involvement of fast dynamics in lowering the energy barrier for ion conductivity. We also demonstrate that both the activation energy for ion transport and the amplitude of the fast fluctuations depend on the high-frequency shear moduli of PolyILs, thus identifying a practically important parameter for tuning conductivity. Finally, the parameters recognized in this work and their connection to the ionic conductivity of PolyILs set the stage for a deeper understanding of the mechanism of ion transport in PolyILs in the glassy state.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1755297

Journal Information:: Journal of Physical Chemistry. B, Condensed Matter, Materials, Surfaces, Interfaces and Biophysical Chemistry, Vol. 124, Issue 46; ISSN 1520-6106

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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