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Discovery brings all-solid-state sodium batteries closer to practical use

Date:
April 11, 2024
Source:
Osaka Metropolitan University
Summary:
Researchers have developed a mass synthesis process for sodium-containing sulfides. Mass synthesis of electrolytes with high conductivity and formability is key to the practical use of all-solid-state sodium batteries, thought to be safer than lithium-ion batteries and less expensive, as sodium is far more plentiful than lithium.
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Researchers develop a process that can lead to mass synthesis yields solid sulfide electrolyte with world's highest reported sodium ion conductivity and glass electrolyte with high formability.

The pursuit of greener energy also requires efficient rechargeable batteries to store that energy. While lithium-ion batteries are currently the most widely used, all-solid-state sodium batteries are attracting attention as sodium is far more plentiful than lithium. This should make sodium batteries less expensive, and solid-state batteries are thought to be safer, but processing issues mean mass production has been difficult.

Osaka Metropolitan University 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.

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," Professor Sakuda said. "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."

The results were published in Energy Storage Materials and Inorganic Chemistry.


Story Source:

Materials provided by Osaka Metropolitan University. Note: Content may be edited for style and length.


Journal Reference:

  1. Akira Nasu, Tomoya Otono, Takuma Takayanagi, Minako Deguchi, Atsushi Sakuda, Masahiro Tatsumisago, Akitoshi Hayashi. Utilizing reactive polysulfides flux Na2S for the synthesis of sulfide solid electrolytes for all-solid-state sodium batteries. Energy Storage Materials, 2024; 67: 103307 DOI: 10.1016/j.ensm.2024.103307

Cite This Page:

Osaka Metropolitan University. "Discovery brings all-solid-state sodium batteries closer to practical use." ScienceDaily. ScienceDaily, 11 April 2024. <www.sciencedaily.com/releases/2024/04/240411130248.htm>.
Osaka Metropolitan University. (2024, April 11). Discovery brings all-solid-state sodium batteries closer to practical use. ScienceDaily. Retrieved May 22, 2024 from www.sciencedaily.com/releases/2024/04/240411130248.htm
Osaka Metropolitan University. "Discovery brings all-solid-state sodium batteries closer to practical use." ScienceDaily. www.sciencedaily.com/releases/2024/04/240411130248.htm (accessed May 22, 2024).

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