Exploring Aliovalent Substitutions in the Lithium Halide Superionic Conductor Li3– xIn1– xZrxCl6 (0 ≤ x ≤ 0.5)

In recent years, ternary halides Li3MX6 (M = Y, Er, In; X = Cl, Br, I) have garnered attention assolid electrolytes due to their wide electrochemical stability window and favorable roomtemperatureconductivities. In this material class, the influences of iso- or aliovalentsubstitutions are so far rarely studied in-depth, despite this being a common tool for correlatingstructure and transport properties. In this work, we investigate the impact of Zr substitution onthe structure and ionic conductivity of Li3InCl6 (Li3-xIn1-xZrxCl6 with 0 ≤ x ≤ 0.5) using acombination of neutron diffraction, nuclear magnetic resonance and impedance spectroscopy.Analysis of high-resolution diffraction data shows the presence of an additional tetrahedrallycoordinated lithium position together with cation site-disorder, both of which have not beenreported previously for Li3InCl6. This Li+ position and cation disorder lead to the formation ofa three-dimensional lithium ion diffusion channel, instead of the expected two-dimensionaldiffusion. Upon Zr4+ substitution, the structure exhibits non-uniform volume changes alongwith an increasing number of vacancies, all of which lead to an increasing ionic conductivity inthis series of solid solutions