Physical and electrochemical behavior of affordable Na3SbS4 solid electrolyte at different heat treatment temperatures. Issue 20 (15th October 2022)

• Record Type: Journal Article
• Authors: Liang, Bo; Yu, Liangliang; Wang, Guoda; Lin, Changgui; Gao, Chengwei; Shen, Xiang; Jiao, Qing
• Is Part Of: Ceramics international. Volume 48:Issue 20(2022)
• Page Start: 30144
• Page End: 30150
• Publication Date: 2022-10-15
• Subjects: Na3SbS4 -- Solid electrolyte -- Conductivity -- High-energy ball milling -- Heat treatment temperature; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2022.06.287
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: High-capacity and affordable all-solid-state Na-ion batteries have gathered increasing interest in recent years owing to low-cost sodium, which contributes to reducing the price of these Na-ion batteries to approximately 70% of that in lithium batteries. However, in terms of electrolyte performance and battery cost, the complete replacement of lithium batteries has a long way to go. In this work, low-cost and high-safety Na2 S·9H2 O materials are used in synthesizing Na3 SbS4 solid electrolyte, the price of which is only one-fifth that of high-purity Na2 S. The structure and electrochemical properties are studied through X-ray diffraction analysis, Raman spectroscopy, scanning electron microscopy, and electrochemical tests. Results indicate that a multiphase Na3 SbS4 structure containing cubic and tetragonal phases formed after heat treatment at 300 °C. In addition, a third phase transition of Na3 SbS4 is inferred after further heating at 600 °C. This phase structure contributes to the improvement of electrochemical performance by promoting increasing ionic conductivity to 0.54 mS cm −1 at room temperature (25 °C) and reducing activation energy to 0.076 eV. This work provides an affordable material with good electrochemical properties and not only simplifies the preparation but also greatly reduces the risk of the process.