September 22, 2026
Journal Article
Harnessing Chemical Short-Range Disorder to Improve Lithium Retention in Epitaxial LLTO Solid-Electrolyte Thin Films
Abstract
Lithium lanthanum titanate Li3xLa2/3-xTiO3 (LLTO) is a promising perovskite-based solid-state electrolyte for next-generation lithium-ion batteries, but controlling crystallinity and Li stoichiometry in thin-film form is challenging because high growth temperatures are required to achieve good crystallinity while Li remains strongly volatile. Here, we systematically investigate the effect of substrate temperature on epitaxial LLTO thin films grown by pulsed laser deposition. We identify a narrow growth window (775-800?°C) in which LLTO films grow as c-axis oriented with atomically flat surfaces. Lower growth temperatures (Published: September 22, 2026