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A sodium-ion sulfide solid electrolyte with unprecedented conductivity at room temperature

2019; Nature Portfolio; Volume: 10; Issue: 1 Linguagem: Inglês

10.1038/s41467-019-13178-2

2041-1723

Akitoshi Hayashi, Naoki Masuzawa, So Yubuchi, Fumika Tsuji, Chie Hotehama, Atsushi Sakuda, Masahiro Tatsumisago,

Thermal Expansion and Ionic Conductivity

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.