DataVXACS Materials LettersPaper
journal article·2019-12-02

A New Superionic Plastic Polymorph of the Na + Conductor Na 3 PS 4

Theodosios Famprikis, James A. Dawson, François Fauth, Oliver Clemens, Emmanuelle Suard, Benoit Fleutot, Matthieu Courty, Jean-Noël Chotard, M. Saiful Islam, Christian Masquelier

ACS Materials Letters· Volume 1· Issue 6
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Source abstract

Abstract

Na3PS4 is one of the most promising Na+ conductors, relevant for applications that can leverage its high ionic conductivity, such as solid-state batteries. Currently, two crystalline phases of the material have been identified, and it has been thought to melt above 500 °C. In contrast, based on diffraction, ab initio simulations, impedance spectroscopy, and thermal analysis, we show that Na3PS4 remains solid above this temperature and transforms to a third polymorph, γ, exhibiting fast-ion conduction and an orthorhombic crystal structure. We show that the fast Na+-conduction is associated with rotational motion of the thiophosphate polyanions pointing to a plastic crystal. These findings are of major importance for the development and understanding of new polyanion-based solid electrolytes.
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Research context

Energy storage

OpenAlex topics: Advanced Battery Materials and Technologies · Advancements in Battery Materials · Thermal Expansion and Ionic Conductivity

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Laboratoire de Réactivité et Chimie des Solides (CNRS UMR 7314), Amiens, France

Department of Chemistry, University of Bath, Bath, United Kingdom

ALISTORE−European Research Institute (CNRS FR 3104), Amiens, France

CELLS−ALBA Synchrotron, Barcelona, Spain

Fachgebiet Materialdesign durch Synthese, Institut für Materialwissenschaft, Technische Universität Darmstadt, and Karlsruher Institut für Technologie, Institut für Nanotechnologie, Karlsruhe, Germany

Institut Laue−Langevin, Grenoble, France

Réseau sur le Stockage Électrochimique de l’Énergie (RS2E CNRS FR 3459), Amiens, France

Funding

Engineering and Physical Sciences Research Council · Centre National de la Recherche Scientifique · Alistore European research institute

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