Energy Storage Science and Technology ›› 2020, Vol. 9 ›› Issue (5): 1266-1283.doi: 10.19799/cnki.2095-4239.2020.0108

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Recent development on sulfide solid electrolytes for solid-state sodium batteries

Manman JIA(), Long ZHANG()   

  1. Clean Nano Energy Center, State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, Hebei, China
  • Received:2020-03-16 Revised:2020-04-01 Online:2020-09-05 Published:2020-09-08
  • Contact: Long ZHANG E-mail:MJia2020@163.com;lzhang@ysu.edu.cn

Abstract:

All-solid-state sodium-ion batteries consist of positive and negative electrodes and solid electrolytes. Solid electrolytes require not only high ionic conductivity but also a good electrolyteelectrode solid contact and interfacial stability. Of the diverse sodium-ion solid electrolytes, including oxides, sulfides, borohydrides, and polymers, sulfides are extremely attractive because of their advantages of high ionic conductivity and elastic modulus, good electrical contact with electrodes with cold-processing or solution coating, and broad temperature stability. In recent years, significant progress has been made concerning their ionic conductivity; however, their chemical stability and interfacial stability toward electrodes still requires in-depth study. In this study, the progress regarding sulfide-based sodium-ion solid electrolytes is reviewed, including preparation techniques, chemical structure, and ion transport. The mechanochemical synthesis, solid-state reaction, and solution synthesis methods are primarily discussed. The design strategies regarding the Na3PS4- and Na3SbS4-based ternary phase systems and the Na11Sn2PS12- and Na11Sn2SbS12-based quaternary phase systems are summarized. The influencing mechanism of cation- and anion-doping on Na+ vacancies/interstitials, Na+-lattice binding energy, lattice softening, Na+ distribution, and space groups is analyzed. In parallel, the interfacial performance between electrolytes and electrodes in all-solid-state batteries is reviewed, including the solidsolid contact between positive electrodes and electrolytes and the interfacial stability between negative electrodes and electrolytes. It is important to solve the interfacial issue that has arisen regarding sulfide solid electrolytes. Finally, some suggestions are presented for further investigations of sulfide-based sodium-ion solid electrolytes.

Key words: sulfide-based solid electrolytes, solid-state sodium batteries, synthesis technique, ionic conductivity, interface

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