Press Releases | November 15, 2021

Toward the Establishment of Mass Production Technology for Sulfide Solid Electrolytes

The research group of Department of Electrical and Electronic Information Engineering of Toyohashi University of Technology, consisting of Hirotada Gamo, doctoral course student; Atsushi Nagai, project associate professor; and Atsunori Matsuda, professor, demonstrated that solvent polarity characterized by its dielectric constant plays an important role in the formation of crystalline Li7P3S11 in the liquid-phase synthesis, a solid electrolyte for all-solid-state lithium-ion secondary batteries. Among the solvents systematically studied, the research team found that acetonitrile (ACN) with a high dielectric constant is the best solvent for the liquid-phase synthesis of Li7P3S11, since it enhances the reactivity of lithium thiophosphate and enables the formation of crystalline Li7P3S11 with high conductivity. This achievement is expected to lead to the development of mass production technology for all-solid-state batteries.

Full text: Solvent Effect on Liquid-Phase Synthesis of Lithium Solid Electrolytes
TUT website: Press release