Novel Br1 ion conducting solid electrolyte based on LaOBr

Abstract

Highly Br1 ion conducting solid electrolytes were developed by replacing La3+ ion site in LaOBr with lower valent Sr2+ and Ca2+ ions to form Br1 ion vacancies for Br1 ion conduction with suppressing the sample decomposition. By doping two kinds of divalent cations simultaneously into LaOBr lattice, high amount of Br1 ion vacancy was successfully introduced compared to the previously reported La0.9Sr0.1OBr0.9. Among the samples prepared, the highest Br1 ion conductivity was obtained for the La0.85Sr0.10Ca0.05OBr0.85 solid, which was ca. 5 times higher than that of La0.9Sr0.1OBr0.9