A solid electrolyte containing fast lithium-ion transport channels constructed from heterointerfaces

As a fundamental component of solid-state lithium metal batteries, the design of solid-state electrolytes and the investigation of Li-ion transport mechanisms have consistently been prominent areas of research in the field of solid-state batteries. In this manuscript, we present a solid-state electrolyte composed of Li3ErCl6 and AlCl3. The ion conductivity of this solid electrolyte is measured at 1.02 × 10−3 s/cm at 30 °C, with an activation energy of 0.22 eV. The observed high ion conductivity and low activation energy are attributed to the Li-ion fast transport channels formed by the heterointerfaces between Li3ErCl6 and AlCl3. This material exhibits high mechanical ductility and excellent compatibility with high-voltage cathode materials, rendering it highly suitable for the assembly of high-voltage solid-state lithium metal batteries. We believe that this solid electrolyte has potential for further improvement by improving the concentration of heterointerfaces, and this study offers valuable insights for the design of solid-state electrolytes.