Ion transport in solid polymeric lithium ion electrolytes

ORAL

Abstract

Understanding ion transport in solid polymeric electrolytes (SPEs) continues to be of interest concerning improving safety and energy density of lithium-ion batteries. Towards this end, we present an investigation of lithium ion transport in a baseline SPE consisting of lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) in Poly(ethylene oxide) (PEO) via a combination of x-ray photon correlation spectroscopy (XPCS), x-ray absorption microscopy (XAM), continuum modelling, and molecular dynamics (MD) simulations.
Our experiments yield spatially resolved ion velocities (via XPCS) and ionic concentrations (via XAM) upon polarization of a Li/PEO-LiTFSI/Li symmetric cell, which we compare to our theoretical efforts. Particular interest lies in providing direct insight into the concentration dependent transference numbers, which can be challenging to accurately measure, but are essential to ionic transport. We realize this by variation of the input transport parameters, aided by MD simulations, within the continuum model, until a match with the experimental velocities and concentration profiles is achieved.

*This work was supported by the Joint Center for Energy Storage Research (JCESR).

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Presenters

  • Hans-Georg Steinrueck

    • SLAC - Natl Accelerator Lab

Authors

  • Hans-Georg Steinrueck

    • SLAC - Natl Accelerator Lab

  • Christopher Takacs

    • SLAC - Natl Accelerator Lab

  • David Mackanic

    • Department of Chemical Engineering, Stanford University

  • Benjamin Holladay

    • Department of Physics, University of California, San Diego

  • Hong Keun Kim

    • Argonne National Laboratory

  • Chuntian Cao

    • SLAC - Natl Accelerator Lab

  • Suresh Narayanan

    • Argonne National Laboratory
    • Argonne Natl Lab
    • Advanced Photon Source, Argonne National Laboratory
    • X-Ray Science Division, Argonne National Laboratory

  • Eric Dufresne

    • Argonne Natl Lab
    • X-Ray Science Division, Argonne National Laboratory

  • Yuriy Chushkin

    • ESRF

  • Federico Zontone

    • ESRF

  • Beatrice Ruta

    • ESRF

  • Johannes Will

    • Institute of Micro- and Nanostructure Research (IMN) & Center for Nanoanalysis and Electron Microscopy (CENEM), University of Erlangen-Nürnberg

  • Oleg Borodin

    • Electrochemistry Branch, Sensor and Electron Devices Directorate, U.S. Army Research Laboratory

  • Sunil K Sinha

    • Physics, University of California San Diego
    • Department of Physics, University of California, San Diego

  • Venkat Srinivasan

    • Argonne National Laboratory

  • Michael Toney

    • SLAC - Natl Accelerator Lab
    • SLAC National Accelerator Laboratory
    • SLAC Linear Accelerator Laboratory
    • Stanford Linear Accelerator Laboratory