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

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, Na2.88Sb0.88W0.12S4, with conductivity superior to that of the benchmark electrolyte, Li10GeP2S12. Partial substitution of antimony in Na3SbS4 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, Na2.88Sb0.88W0.12S4. 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.

SUBMITTER: Hayashi A 

PROVIDER: S-EPMC6868223 | biostudies-literature | 2019 Nov

REPOSITORIES: biostudies-literature

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

Hayashi A A   Masuzawa N N   Yubuchi S S   Tsuji F F   Hotehama C C   Sakuda A A   Tatsumisago M M  

Nature communications 20191120 1

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<sub>2.88</sub>Sb<sub>0.88</sub>W<sub>0.12</sub>S<sub>4</sub>, with conductivity superior to that of the benchmark electrolyte, Li<sub>10</sub>GeP<sub>2</sub>S<sub>12</sub>. Partial substitution of antimony in Na<sub>3</sub>SbS<sub>4</sub> with tungsten introduces sodium vacancies and t  ...[more]

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