Issue 33, 2014

Preparation and characterization of highly sodium ion conducting Na3PS4–Na4SiS4 solid electrolytes

Abstract

This study investigated electrical and electrochemical properties of (100 − x)Na3PS4·xNa4SiS4 (mol%) glass–ceramics prepared using mechanical milling and consecutive heat treatment. Glass–ceramics at the compositions of 0 ≤ x ≤ 10 exhibited higher conductivity than 10−4 S cm−1 at room temperature, which was achieved by precipitation of cubic Na3PS4 crystal with high sodium ion conductivity. The conductivity increased concomitantly with increasing Na4SiS4 contents at compositions of 0 ≤ x ≤ 6. The glass–ceramic with 6 mol% Na4SiS4 exhibited conductivity of 7.4 × 10−4 S cm−1 at room temperature, which is the highest value reported for Na+ ion conducting sulfides to date. The conductivities of the glass–ceramics in the composition range of 25 ≤ x ≤ 100, where unknown phases are crystallized, were 10−7–10−5 S cm−1. These were lower than the conductivities of the corresponding glasses before heat treatment. The 90Na3PS4·10Na4SiS4 electrolyte showed a wide electrochemical window of 5 V.

Graphical abstract: Preparation and characterization of highly sodium ion conducting Na3PS4–Na4SiS4 solid electrolytes

Article information

Article type
Paper
Submitted
05 Feb 2014
Accepted
27 Mar 2014
First published
27 Mar 2014

RSC Adv., 2014,4, 17120-17123

Author version available

Preparation and characterization of highly sodium ion conducting Na3PS4–Na4SiS4 solid electrolytes

N. Tanibata, K. Noi, A. Hayashi and M. Tatsumisago, RSC Adv., 2014, 4, 17120 DOI: 10.1039/C4RA00996G

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