Halogen-Substituted LiInCl: Insights into the Evolved Structure, Composition, and Ionic Conductivity.

Ternary Li-containing halides have gained significant interest for all-solid-state batteries because they show high Li-ion conductivity and their structures can be modified. In this study, halogen substitution in LiInCl was attempted to form LiInCl ( = F, Br, I) samples whose phase compositions and Li conductivity were characterized by X-ray diffraction and impedance spectroscopy. Based on the evolution of cell parameters, Cl can be substituted by F within the experimental limit of ≤ 1.2, while by other halogens up to a solid solubility limit of = 0.6 for Br and < 0.1 for I. The Li-ion conductivity diminished with greater nominal compositions of in the samples, especially as other phases exhibiting low conductivity are formed. These results suggest that increased polarizability of is not a dominant factor that influences the Li mobility in LiInCl.