Fast Dynamics and its Role in Conductivity of Polymerized Ionic Liquids

ORAL

Abstract


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 application. 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. By 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 (Tg). In this talk we will demonstrate 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.

*This work was supported by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division.

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Presenters

  • Vera bocharova

    • Oak Ridge National Lab
    • Oak Ridge National Laboratoty

Authors

  • Vera bocharova

    • Oak Ridge National Lab
    • Oak Ridge National Laboratoty

  • Anne-Caroline Genix

    • UNIVERSITY OF MONTPILLIER
    • University of Montpellier

  • Naresh Osti

    • Neutron Scattering Division, Oak Ridge National Laboratory
    • Oak Ridge National Lab
    • Neutron Scattering Division, Neutron Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
    • Oak Ridge National Laboratory
    • Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA

  • Eugene Mamontov

    • Oak Ridge National Lab
    • Neutron Scattering Division, Neutron Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
    • Oak Ridge National Laboratory
    • Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA

  • Alexei Sokolov

    • Oak Ridge National Lab
    • Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
    • Oak Ridge National Laboratory
    • University of Tennessee
    • Department of Chemistry, University of Tennessee, Knoxville, USA
    • Department of Chemistry, university of Tennessee