Novel Br⁻ ion conducting solid electrolyte based on LaOBr

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Highly Br⁻ ion conducting solid electrolytes were developed by replacing La³⁺ ion site in LaOBr with lower valent Sr²⁺ and Ca²⁺ ions to form Br⁻ ion vacancies for Br⁻ ion conduction with suppressing the sample decomposition. By doping two kinds of divalent cations simultaneously into LaOBr lattice, high amount of Br⁻ ion vacancy was successfully introduced compared to the previously reported La_0.9Sr_0.1OBr_0.9. Among the samples prepared, the highest Br⁻ ion conductivity was obtained for the La_0.85Sr_0.10Ca_0.05OBr_0.85 solid, which was ca. 5 times higher than that of La_0.9Sr_0.1OBr_0.9.