| Autor: |
Dietrich C; Institute of Physical Chemistry, Justus-Liebig-University Giessen , Heinrich-Buff-Ring 17, D-35392 Giessen, Germany., Weber DA; Institute of Physical Chemistry, Justus-Liebig-University Giessen , Heinrich-Buff-Ring 17, D-35392 Giessen, Germany., Culver S; Institute of Physical Chemistry, Justus-Liebig-University Giessen , Heinrich-Buff-Ring 17, D-35392 Giessen, Germany., Senyshyn A; Heinz Maier-Leibnitz Zentrum, Technische Universität München , 85748 Garching, Germany., Sedlmaier SJ, Indris S, Janek J; Institute of Physical Chemistry, Justus-Liebig-University Giessen , Heinrich-Buff-Ring 17, D-35392 Giessen, Germany., Zeier WG; Institute of Physical Chemistry, Justus-Liebig-University Giessen , Heinrich-Buff-Ring 17, D-35392 Giessen, Germany. |
| Abstrakt: |
Inspired by the ongoing search for new superionic lithium thiophosphates for use in solid-state batteries, we present the synthesis and structural characterization of Li 2 P 2 S 6 , a novel crystalline lithium thiophosphate. Whereas M 2 P 2 S 6 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 Li 2 P 2 S 6 . Additionally, impedance spectroscopy is used to evaluate its ionic conductivity. We show that Li 2 P 2 S 6 possesses P 2 S 6 2- polyhedral units with edge-sharing PS 4 tetrahedra and only one-dimensional diffusion pathways with localized Li-Li pairs, leading to a low ionic conductivity for lithium. |
