Issue 2, 2019

An argyrodite sulfide-based superionic conductor synthesized by a liquid-phase technique with tetrahydrofuran and ethanol

Abstract

Sulfide-based solid electrolytes with halide elements are essential components of advanced all-solid-state batteries. Argyrodite crystals are viable candidates as solid electrolytes for realizing all-solid-state batteries. However, a simple and effective route for the synthesis of these solid electrolytes is required. Herein, argyrodite Li6PS5Br superionic conductors were synthesized from a homogeneous solution by a liquid-phase technique. The Li6PS5Br solid electrolyte was prepared in a shorter synthesis time of one day using tetrahydrofuran and ethanol as compared with the solid-phase method. More importantly, of all the sulfide-based solid electrolytes prepared by liquid-phase techniques, Li6PS5Br showed the highest ionic conductivity of 3.1 mS cm−1 at 25 °C. The obtained particle size of 1 μm is suitable for application in all-solid-state cells. Moreover, coating electrode active materials with the solid electrolyte using the precursor solution led to a large contact area between the electrode and electrolyte and improved the cell performance. In addition, infiltrating a porous electrode with the precursor solution of the solid electrolyte is suitable for forming homogeneous composite electrodes to improve the cell performance. The all-solid-state cell using the Li6PS5Br fine powder with a high conductivity of 1 mS cm−1 or more exhibited a reversible capacity of 150 mA h g−1. This technique is effective for the industrial production of solid electrolytes and is applicable to all-solid-state batteries.

Graphical abstract: An argyrodite sulfide-based superionic conductor synthesized by a liquid-phase technique with tetrahydrofuran and ethanol

Supplementary files

Article information

Article type
Paper
Submitted
30 Sep 2018
Accepted
16 Nov 2018
First published
19 Nov 2018

J. Mater. Chem. A, 2019,7, 558-566

Author version available

An argyrodite sulfide-based superionic conductor synthesized by a liquid-phase technique with tetrahydrofuran and ethanol

S. Yubuchi, M. Uematsu, C. Hotehama, A. Sakuda, A. Hayashi and M. Tatsumisago, J. Mater. Chem. A, 2019, 7, 558 DOI: 10.1039/C8TA09477B

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