K3SbS4 as a Potassium Superionic Conductor with Low Activation Energy for K-S Batteries

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

1 Scopus Citations
View graph of relations

Author(s)

  • Jieren Shao
  • Jingfeng Zheng
  • Lei Qin
  • Songwei Zhang
  • Yiying Wu

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article numbere202200606
Journal / PublicationAngewandte Chemie (International Edition)
Publication statusOnline published - 6 Mar 2022

Abstract

Solid-state K-ion conducting electrolytes are key elements to address the current problems in K secondary batteries. Here, we report a sulfide-based K-ion conductor K3SbS4 with a low-activation energy of 0.27 eV. W-doped K3-xSb1-xWxS4 (x=0.04, 0.06, 0.08, 0.10 and 0.12) compounds were also explored for increasing vacancy concentrations and improving ionic conductivity. Among them, K2.92Sb0.92W0.08S4 exhibits the highest conductivity of 1.4x10-4 S cm-1 at 40 °C, which is among the best reported potassium-ion conductors at ambient temperature. In addition, K2.92Sb0.92W0.08S4 is electrochemically stable with long-chained potassium polysulfide of K2Sx. A room-temperature solid potassium-sulfur (K-S) battery system has therefore been successfully demonstrated, which is the first K-S battery prototype using non-commercial inorganic-based electrolyte to block the polysulfide shuttle.

Research Area(s)

  • Ionic Conductivity, K-Ion Conductor, Potassium-Sulfur Batteries, Shuttle Effect, Solid-State Electrolyte, NA3SBS4

Citation Format(s)

K3SbS4 as a Potassium Superionic Conductor with Low Activation Energy for K-S Batteries. / Shao, Jieren; Zheng, Jingfeng; Qin, Lei et al.

In: Angewandte Chemie (International Edition), 06.03.2022.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review