Synthesis and detailed electrochemical analysis of sulfide-based solid electrolyte with practical level ionic conductivity via liquid phase method

Hikima Kazuhiro

Assistant Professor, Department of Electrical and Electronic Information Engineering

A combined Toyohashi University of Technology (TUT) and Osaka Metropolitan University (OMU) research team successfully synthesized the sulfide-based solid electrolyte Li₁₀GeP₂S₁₂ with practical room-temperature ionic conductivity by optimizing the heat treatment process in the solution method. The team includes, on the TUT side, master’s student Ryota Kishi, Assistant Professor Kazuhiro Hikima, Professor Atsunori Matsuda from the Department of Electrical and Electronic Information Engineering, and Professor Hiroyuki Muto from the Institute of Liberal Arts and Sciences, along with Specially Appointed Associate Professor (at the time) Hirofumi Tsukasaki and Professor Shigeo Mori from the Department of Materials Science from OMU., The Li₁₀GeP₂S₁₂ synthesized solution method exhibits unique electrochemical properties compared to ball-mill-synthesized samples, such as a small particle size with high grain boundary resistance and surface layer from the organic solvent that is highly stable with respect to Li-In anodes.

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