Post-lithiation: a way to control the ionic conductivity of solid-state thin film electrolyte.

Ionic conductivity is pivotal for solid-state battery performance. While the garnet oxide electrolyte LiLaZrO (LLZO) boasts high ionic conductivity due to its distinct crystal structure and lithium-ion mobility, lithium loss during fabrication hampers its potential. In this study, we introduce a method that merges synthesis optimization with a post-lithiation process, enhancing LLZO's ionic conductivity.