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室温で世界最高の導電率を示すナトリウムイオン伝導性硫化物固体電解質を開発 ~リチウムイオン電池を凌駕する次世代型全固体電池の実現に一歩前進~




大阪府立大学大学院 工学研究科 林 晃敏 教授らのグループは、室温で非常に高いナトリウムイオン伝導性を示す硫化物固体電解質の作製に成功しました。これにより、より安全で高エネルギー密度を持つ次世代型全固体電池の開発に大きく貢献することとなります。



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. Hayashi, N. Masuzawa, S. Yubuchi, F. Tsuji, C. Hotehama, A. Sakuda, M. Tatsumisago, Nat. Commun. 10, 5266 (2019). "A sodium-ion sulfide solid electrolyte with unprecedented conductivity at room temperature"

DOI: 10.1038/s41467-019-13178-2

Published on November 20, 2019




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