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Researchers develop process for mass synthesis for sodium-containing sulfides for sodium-ion battery electrolytes

A team of researchers at Osaka Metropolitan University, led by Associate Professor Atsushi Sakuda and Professor Akitoshi Hayashi, both of the Graduate School of Engineering, led a research team in developing a process that can lead to mass synthesis for sodium-containing sulfides.

Using sodium polysulfides (sulfides with two or more atoms of sulfur) as both the material and the flux, which promotes fusion, the team created a solid sulfide electrolyte with the world’s highest reported sodium ion conductivity—about 10 times higher than required for practical use—and a glass electrolyte with high reduction resistance.


The synthesized solid sulfide electrolyte Na2.88Sb0.88W0.12S4 has the world’s highest reported sodium ion conductivity. Credit: Atsushi Sakuda, Osaka Metropolitan University

Mass synthesis of such electrolytes with high conductivity and formability is key to the practical use of all-solid-state sodium batteries.

This newly developed process is useful for the production of almost all sodium-containing sulfide materials, including solid electrolytes and electrode active materials. Also, compared to conventional methods, this process makes it easier to obtain materials that display higher performance, so we believe it will become a mainstream process for the future development of materials for all-solid-state sodium batteries.

—Professor Atsushi Sakuda

The results were published in two papers: an open-access paper in Energy Storage Materials; and a paper in Inorganic Chemistry.


  • Akira Nasu, Tomoya Otono, Takuma Takayanagi, Minako Deguchi, Atsushi Sakuda, Masahiro Tatsumisago, Akitoshi Hayashi (2024) “Utilizing reactive polysulfides flux Na2Sx for the synthesis of sulfide solid electrolytes for all-solid-state sodium batteries,” Energy Storage Materials, Volume 67, doi: 10.1016/j.ensm.2024.103307

  • Tomoya Otono, Akira Nasu, Taichi Asakura, Hiroe Kowada, Kota Motohashi, Masahiro Tatsumisago, Atsushi Sakuda, and Akitoshi Hayashi (2024) “High-Sodium-Concentration Sodium Oxythioborosilicate Glass Synthesized via Ambient Pressure Method with Sodium Polysulfides” Inorganic Chemistry 63 (10), 4589-4594 doi: 10.1021/acs.inorgchem.3c04101


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