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 Okt. 2020
Accepted
31 Janv. 2021
First published
02 Febr. 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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