Solid electrolyte composed of nanoparticles shows promise for all-solid-state batteries

Phys.org October 2, 2024
Halide solid electrolytes are promising for improving the electrochemical performance of all-solid-state batteries. However, the state-of-the-art sodium-ion-conducting halides are not as high in conductivity as expected and lack reduction stability. Researchers in Japan found oxychlorides in a ternary system NaCl–TaCl5–Ta2O5 have high conductivities, formabilities, and oxidation and reduction stabilities. They mechanochemically prepared samples composed of NaCl and Ta2O5 nanoparticles embedded in an Na–Ta–Cl–O amorphous matrix, possessing ionic conductivities of 2.5 Ă— 10–3 S cm–1 at 25 °C and electrochemical potential windows of 0.4–4.1 versus Na+/Na. Compression tests revealed that the nanoparticles in the oxychloride electrolytes improved the mechanical strength. According to the researchers their findings will facilitate the development of solid electrolytes composed of nanoparticles balanced with high ionic conductivities, formabilities, and electrochemical stabilities… read more. Open Access TECHNICAL ARTICLE

TEM observation results for the x = 0.25 powder sample… Credit: Chemistry of Materials, XXXX, XXX, XXX-XXX, September 24, 2024.

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