The researchers synthesized Li3TiCl6 from LiCl and TiCl3 and, with electrochemical testing, found room-temperature ionic conductivities above 1 mS cm–1. This is a relatively high value that enables positive electrode formulation in which the active material comprises 95 wt% of the solid composite electrode, a greater proportion than the <80 wt% in most solid-state cells. X-ray diffraction and bond-valance site-energy calculations suggest that Li+ transport occurs within and between the layered planes of Li3TiCl6 more easily than in conventional oxide materials. Furthermore, under 350 MPa compression, Li3TiCl6 showed an 86% higher relative density, suggesting greater durability against crack formation during battery cycling.