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A key material for realizing all-solid-state rechargeable batteries is an excellent inorganic superionic conductor. Here, we demonstrate a sulfide superionic conductor, Na2.88Sb0.88W0.12S4, with conductivity superior to that of the benchmark electrolyte, Li10GeP2S12. Partial substitution of antimony in Na3SbS4 with tungsten induces the generation of sodium vacancies and tetragonal to cubic phase transition, resulting in the highest room-temperature conductivity of 32 mS cm−1 for a sintered body, Na2.88Sb0.88W0.12S4. Moreover, this sulfide has additional advantages: it generates a negligible amount of harmful hydrogen sulfide in humid atmosphere and it can be densified at much lower sintering temperatures than those (>1000 °C) of typical oxide sodium ion conductors, Na3Zr2Si2PO12 and b-alumina. The discovery of the superior sodium ion conductor boosts the ongoing research for solid-state rechargeable battery technology with high safety, cost-effectiveness, large energy, and power density.


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

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

Nature Communications, 10: 5266 (2019). DOI:

Published on November 20, 2019


大阪府立大学 プレスリリース

グループ ウェブサイト


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