Lithium Antiperovskite-Derived Glass Solid Electrolytes

High Resolution Image Download MS PowerPoint Slide In this paper, we report the synthesis of Li 2 OHX (X = Br, Cl)-based glasses. These glasses were found to be challenging to synthesize, requiring extreme cooling rates achievable only by a twin-roll quench process. As has been speculated for antiperovskite-derived glasses, indications of improved lithium-ion dynamics are observed. Notably, spin–lattice relaxation nuclear magnetic resonance spectroscopy reveals a higher hopping frequency and significantly lower activation energy for Li 2 OHBr glasses (0.29 eV) compared to the crystalline Li 2 OHBr (0.39 eV). This may be attributable to the increased free volume in the glass samples (ρ glass /ρ cryst = 0.83) and a reduced ionic interaction of lithium ions with the glass structure. Despite these promising findings, the glasses were found to be unstable under pressure and crystallized in attempts to produce bulk samples for impedance measurements.