Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 61, Issue 20, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202200606
Keywords
Ionic Conductivity; K-Ion Conductor; Potassium-Sulfur Batteries; Shuttle Effect; Solid-State Electrolyte
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Funding
- U.S. Department of Energy [DE-FG02-07ER46427]
- Ohio State University
- Argonne National Laboratory
- DOE Office of Science [DE-AC0206CH11357]
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The study introduces a new sulfide-based potassium-ion conductor K3SbS4 and W-doped K3-xSb1-xWxS4 compounds, among which K2.92Sb0.92W0.08S4 exhibits the highest conductivity of 1.4 x 10(-4) S cm(-1). The research successfully demonstrates a room-temperature solid potassium-sulfur (K-S) battery system prototype, using a non-commercial inorganic electrolyte to block the polysulfide shuttle.
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 1.4 x 10(-4) S cm(-1) at 40 degrees 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.
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