Investigation of Pseudo-Binary Li₂MoO₄–LiI Electrolytes Prepared via Mechanochemistry

All-solid-state lithium batteries require solid electrolytes that are both highly ion-conductive and mechanically robust.Here, we report a novel pseudo-binary Li 2 MoO 4 -LiI electrolyte system synthesized via a mechanochemical process.The optimized 40Li 2 MoO 4 •60LiI (mol%) achieved an ionic conductivity of 2.6×10 -5 S cm -1 at 25 °Chigher than those of Li 2 MoO 4 and LiI-while maintaining low electronic conductivity (~10 -9 S cm -1 ).This oxidebased electrolyte exhibited good densification under cold pressing, reaching ~85% relative density at 360 MPa, which is unusually high for oxide ceramics.Structural analyses (XRD, Raman, NMR, and XPS) revealed an amorphous network containing MoO 4 2-units along with residual crystalline LiI.These results underscore the potential of Li 2 MoO 4 -LiI electrolytes as a new class of ductile inorganic solid electrolytes.