Abstract
Li3InBr6-yXy (X=F, I) was synthesized and the substitution effect on ionic conductivity was investigated. Li3InBr6-yFy was single phase at y {less than or equal to} 3. The lattice constants were decreased with F content. The conductivity of Li3InBr6-yFy was decreased with y and electrochemical stability was improved by the substitution. The conductivity in Li3InBr6-yIy(y {less than or equal to} 3) was changed with y and Li3InBr3I3 showed the highest value in these compounds to be 3 ×10-3 Scm-1 at 333 K. 7Li NMR spectra in Li3InBr6-yIy was sharp and it was confirmed the diffusion of Li ion was fast at room temperature.