Akitoshi Hayashi; Naoki Masuzawa; So Yubuchi; Fumika Tsuji; Chie Hotehama; Atsushi Sakuda; Masahiro Tatsumisago · 2019 · Nature Communications
Paper
Abstract Solid electrolytes are key materials to enable solid-state rechargeable batteries, a promising technology that could address the safety and energy density issues. Here, we report a sulfide sodium-ion conductor, Na 2.88 Sb 0.88 W 0.12 S 4, with conductivity superior to that of the benchmark electrolyte, Li 10 GeP 2 S 12. Partial substitution of antimony in Na 3 SbS 4 with tungsten introduces sodium vacancies and tetragonal to cubic phase transition, giving rise to the highest room-temperature conductivity of 32 mS cm −1 for a sintered body, Na 2.88 Sb 0.88 W 0.12 S 4. Moreover, this sulfide possesses additional advantages including stability against humid atmosphere and densification at much lower sintering temperatures than those (>1000 °C) of typical oxide sodium-ion conductors. The discovery of the fast sodium-ion conductors boosts the ongoing research for solid-state rechargeable battery technology with high safety, cost-effectiveness, large energy and power densities.
Analysis
This paper reports a novel sulfide sodium-ion conductor, Na2.88Sb0.88W0.12S4, exhibiting superior room-temperature conductivity and enhanced stability for solid-state rechargeable batteries.
Discovery
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