Solid-state K-ion conducting electrolytes are key elements to address the current problems in K secondary batteries. Here, we report a sulfide-based Kion conductor K 3 SbS 4 with a low-activation energy of 0.27 eV. W-doped K 3À x Sb 1À x W x S 4 (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, K 2.92 Sb 0.92 W 0.08 S 4 exhibits the highest conductivity of 1.4 × 10 À 4 S cm À 1 at 40 °C, which is among the best reported potassium-ion conductors at ambient temperature. In addition, K 2.92 Sb 0.92 W 0.08 S 4 is electrochemically stable with long-chained potassium polysulfide of K 2 S x . A room-temperature solid potassium-sulfur (KÀ S) battery system has therefore been successfully demonstrated, which is the first KÀ S battery prototype using non-commercial inorganic-based 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 1.4×10−4 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.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.