TY - JOUR
T1 - Structure and Sodium Ion Transport in Na11+ xSn2+ x(Sb1- yP y)1- xS12
AU - Kraft, Marvin A.
AU - Gronych, Lara M.
AU - Famprikis, Theodosios
AU - Ohno, Saneyuki
AU - Zeier, Wolfgang G.
N1 - Funding Information:
The research was funded by the Emmy–Noether program of the DFG under Grant ZE 1010/4-1. T.F. is grateful for a 1-year research grant funded by the German Academic Exchange Service (DAAD). S.O. gratefully acknowledges the Alexander von Humboldt Foundation for financial support through a Postdoctoral Fellowship. We thank the beamline staff of 11-BM at the Advanced Photon Source. Use of the Advanced Photon Source at Argonne National Laboratory was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357.
Publisher Copyright:
Copyright © 2020 American Chemical Society.
PY - 2020/8/11
Y1 - 2020/8/11
N2 - 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.
AB - 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.
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U2 - 10.1021/acs.chemmater.0c01964
DO - 10.1021/acs.chemmater.0c01964
M3 - Article
AN - SCOPUS:85092108832
SN - 0897-4756
VL - 32
SP - 6566
EP - 6576
JO - Chemistry of Materials
JF - Chemistry of Materials
IS - 15
ER -