2018 Volume 126 Issue 10 Pages 761-765
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 La0.9Sr0.1OBr0.9. Among the samples prepared, the highest Br− 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.