Structure and Sodium Ion Transport in Na11+ xSn2+ x(Sb1- yP y)1- xS12

Marvin A. Kraft, Lara M. Gronych, Theodosios Famprikis, Saneyuki Ohno, Wolfgang G. Zeier

    Research output: Contribution to journalArticlepeer-review

    15 Citations (Scopus)

    Abstract

    Sulfidic sodium ion conductors are currently investigated for the possible use in all-solid-state sodium ion batteries. The design of high-performing electrolytes in terms of temperature-dependent ionic transport is based upon the fundamental understanding of structure-transport relationships within the given structural phase boundaries inherent to the investigated materials class. In this work, the Na+ superionic structural family of Na11Sn2PS12 is explored by using the systematic antimony substitution with phosphorus in Na11+xSn2+x(Sb1-yPy)1-xS12. A combination of Rietveld refinements against X-ray synchrotron diffraction data with electrochemical impedance spectroscopy is used to monitor the changes in the anionic framework, the Na+ substructure, and the ionic transport. A new simplified descriptor for the average Na+ diffusion pathways, the average Na+ polyhedral volume, is introduced, which is used to correlate the contraction of the overall lattice and the found activation barriers in the system. This study exemplifies how substitution affects diffusion pathways in ionic conductors and widens the knowledge about the related structural motifs and their influence on the ionic transport in this novel class of ionic conductors.

    Original languageEnglish
    Pages (from-to)6566-6576
    Number of pages11
    JournalChemistry of Materials
    Volume32
    Issue number15
    DOIs
    Publication statusPublished - Aug 11 2020

    All Science Journal Classification (ASJC) codes

    • General Chemistry
    • General Chemical Engineering
    • Materials Chemistry

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