Li$+$ transport in poly(ethylene oxide) based electrolyte: A combined study of neutron scattering, dielectric spectroscopy, and MD simulation

POSTER

Abstract

Dynamics of Li$+$ transport in polyethylene oxide (PEO) and lithium bis(trifluoromethanesulfonyl)imde (LiTFSI) mixtures are investigated by combining various experimental techniques (neutron spin-echo and dielectric spectroscopy) with molecular dynamics (MD) simulations. Our results suggest that the characteristic live times within the cages formed by oxygens are mainly determined by the alpha-relaxation which corresponds to local segmental motions of polymers, to a much lesser extent by the main chain relaxation, and not at all by the beta-relaxation or any other faster processes. The significant contribution of Li$+$ hopping process to the ion conductivity is also identified. Subsequently, detailed characteristic length and time scales of various Li$+$ transport processes in solid polymer electrolytes are presented and interpreted.

Authors

  • Changwoo Do

    • Oak Ridge National Laboratory

  • Peter Lunkenheimer

    • Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, 86159 Augsburg, Germany

  • Diddo Diddens

    • Institut f\"ur Physikalische Chemie, Westf\"alische Wilhelms-Universit\"at M\"unster, 48149 M\"unster, Germany

  • Marion G\"otz

    • Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, 86159 Augsburg, Germany

  • Matthias Wei{\ss}

    • Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, 86159 Augsburg, Germany

  • Alois Loidl

    • Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, 86159 Augsburg, Germany

  • Xiao-Guang Sun

    • Oak Ridge National Laboratory

  • J\"urgen Allgaier

    • J\"ulich Centre for Neutron Science, Forschungszentrum J\"ulich, 52425 J\"ulich, Germany

  • Michael Ohl

    • J\"ulich Centre for Neutron Science, Forschungszentrum J\"ulich, 52425 J\"ulich, Germany