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      Synthesis, Structural Characterization, and Lithium Ion Conductivity of the Lithium Thiophosphate Li2P2S6.

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          Abstract

          Inspired by the ongoing search for new superionic lithium thiophosphates for use in solid-state batteries, we present the synthesis and structural characterization of Li2P2S6, a novel crystalline lithium thiophosphate. Whereas M2P2S6 with the different alkaline elements (M = Na, K, Rb, Cs) is known, the lithium counterpart has not been reported yet. Herein, we present a combination of synchrotron pair distribution function analysis and neutron powder diffraction to elucidate the crystal structure and possible Li(+) diffusion pathways of Li2P2S6. Additionally, impedance spectroscopy is used to evaluate its ionic conductivity. We show that Li2P2S6 possesses P2S6(2-) polyhedral units with edge-sharing PS4 tetrahedra and only one-dimensional diffusion pathways with localized Li-Li pairs, leading to a low ionic conductivity for lithium.

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          Author and article information

          Journal
          Inorg Chem
          Inorganic chemistry
          American Chemical Society (ACS)
          1520-510X
          0020-1669
          May 09 2017
          Affiliations
          [1 ] Institute of Physical Chemistry, Justus-Liebig-University Giessen , Heinrich-Buff-Ring 17, D-35392 Giessen, Germany.
          [2 ] Heinz Maier-Leibnitz Zentrum, Technische Universität München , 85748 Garching, Germany.
          Article
          10.1021/acs.inorgchem.7b00751
          28485931
          9941fad9-ac40-4f45-91d7-06a17a7c08e2
          History

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