A Structurally Flexible Halide Solid Electrolyte with High Ionic Conductivity and Air Processability

In this work, a structurally revivable, chloride-ion conducting solid electrolyte (SE), CsSn0.9In0.067Cl3, with high ionic conductivity of 3.45 × 10−4 S cm−1 at 25 °C is investigated. The impedance spectroscopy, density functional theory, solid-state 35Cl NMR, and electron paramagnetic resonance studies collectively reveal that the Cl− mobility originates in flexibility structural building blocks, Sn/InCl6 octahedra. vacancy-dominated ion diffusion encompasses co-ordinated Sn/In(Cl) site displacements depend on exact stoichiometry, are accompanied by changes local magnetic moments. Owing to these promising properties, suitability as an demonstrated designing all-solid-state batteries, different anodes cathodes. comparative investigation interphases Li, Li–In, Mg, Ca reveals levels reactivity interphase formation. CsSn0.9In0.067Cl3 demonstrates excellent humidity tolerance (up 50% relative humidity) ambient air, maintaining integrity without compromises conductivity, which stands contrast commercial halide-based lithium conductors. discovery halide perovskite conductor, air processability structure revival ability paves way for development advanced processable SEs, next-generation batteries.