An Air-Stable Na3SbS4 Superionic Conductor Prepared by a Rapid and Economic Synthetic Procedure

• Published in: Angewandte Chemie (International ed.) Vol. 55; no. 30; pp. 8551 - 8555
• Main Authors: Wang, Hui, Chen, Yan, Hood, Zachary D., Sahu, Gayatri, Pandian, Amaresh Samuthira, Keum, Jong Kahk, An, Ke, Liang, Chengdu
• Format: Journal Article
• Language: English
• Published: Weinheim Blackwell Publishing Ltd 18.07.2016; Wiley Subscription Services, Inc; Wiley
• Edition: International ed. in English
• Subjects: air-stable materials; chemical stability; ENERGY STORAGE; hard and soft acid and base theory (HSAB); ionic conductivity; mild temperature; sodium superionic conductor; solid-state sodium batteries; synthesis
• ISSN: 1433-7851; 1521-3773
• DOI: 10.1002/anie.201601546

All‐solid‐state sodium batteries, using solid electrolyte and abundant sodium resources, show great promise for safe, low‐cost, and large‐scale energy storage applications. The exploration of novel solid electrolytes is critical for the room temperature operation of all‐solid‐state Na batteries. An ideal solid electrolyte must have high ionic conductivity, hold outstanding chemical and electrochemical stability, and employ low‐cost synthetic methods. Achieving the combination of these properties is a grand challenge for the synthesis of sulfide‐based solid electrolytes. Design of the solid electrolyte Na3SbS4 is described, realizing excellent air stability and an economic synthesis based on hard and soft acid and base (HSAB) theory. This new solid electrolyte also exhibits a remarkably high ionic conductivity of 1 mS cm−1 at 25 °C and ideal compatibility with a metallic sodium anode. A Na3SbS4 superionic conductor was designed and synthesized on the basis of hard and soft acid and base theory. This new sulfide‐based solid electrolyte shows excellent air stability and remarkable ionic conductivity, as well as great electrochemical compatibility with a metallic sodium anode.