Structure and ion conducting properties of mixed-alkali Na3‑xLixInCl6 solid electrolytes

Ball-milled and annealed Na 3− x Li x InCl 6 samples exhibit a solubility limit at x = 0.6 and a monoclinic-to-trigonal phase transition. Neutron diffraction and impedance spectroscopy suggest a connected Li + network with enhanced ionic conductivity.