Issue 5, 2021

Preparation and characterization of sodium-ion conductive Na3BS3 glass and glass–ceramic electrolytes

Abstract

In order to find suitable solid electrolytes for all-solid-state sodium batteries, sulfide electrolytes composed of tetrahedral structural units such as PS4, SnS4 and SbS4 have been widely studied. In this paper, the ionic conductivities of Na3BS3ortho-thioborate electrolytes with triangular BS3 units are firstly reported. Na3BS3 glass was prepared via a mechanochemical process from crystalline Na3BS3 (monoclinic phase). The crystalline Na3BS3 was pre-synthesized from a mixture of Na2S, B, and S due to the instability of the B2S3 compound. A new metastable phase of trigonal Na3BS3 was precipitated as the primary phase by crystallization of the Na3BS3 glass. The prepared glass–ceramic electrolyte showed a higher ionic conductivity than the monoclinic Na3BS3 phase. The Na3BS3 glass showed the highest conductivity of 1.1 × 10−5 S cm−1, which was higher than that of conventional Na3PS4 glass. Futhermore, the Na3BS3 glass showed a superior formability and electrochemical stability to Na15Sn4 negative electrode. An all-solid-state cell with the Na3BS3 glass as an electrolyte successfully operated as a secondary battery at 60 °C. It is concluded that the Na3BS3 glass with triangular structural units has appropriate properties as a solid electrolyte for application to all-solid-state sodium batteries. The results of this study extend research on multi-component sulfide electrolytes with triangular BS3 structural units and contribute to the development of solid electrolytes for all-solid-state batteries.

Graphical abstract: Preparation and characterization of sodium-ion conductive Na3BS3 glass and glass–ceramic electrolytes

Supplementary files

Article information

Article type
Paper
Submitted
09 10 2020
Accepted
31 1 2021
First published
02 2 2021
This article is Open Access
Creative Commons BY license

Mater. Adv., 2021,2, 1676-1682

Preparation and characterization of sodium-ion conductive Na3BS3 glass and glass–ceramic electrolytes

F. Tsuji, A. Nasu, C. Hotehama, A. Sakuda, M. Tatsumisago and A. Hayashi, Mater. Adv., 2021, 2, 1676 DOI: 10.1039/D0MA00777C

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