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Issue 2, 2019
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An argyrodite sulfide-based superionic conductor synthesized by a liquid-phase technique with tetrahydrofuran and ethanol

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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

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Publication details

The article was received on 30 Sep 2018, accepted on 16 Nov 2018 and first published on 19 Nov 2018


Article type: Paper
DOI: 10.1039/C8TA09477B
Citation: J. Mater. Chem. A, 2019,7, 558-566

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    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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