LiF: past, present, and future in advanced material applications—insights into battery technology: a review

Lithium fluoride has attracted considerable attention due to its distinctive properties, such as relatively high ionic conductivity, chemical stability, and compatibility with various battery components. Initially employed as a dosimeter for radiation dose measurement, the scope of LiF applications has significantly broadened over the years. This review delves into the historical and contemporary uses of LiF, with a particular emphasis on its role in the evolution of lithium-ion battery technology. The paper traces the material's progression from a dosimetric tool in the 1980s to an essential element in solid-state batteries, highlighting its surface properties, defect formation, and performance improvements. The advancement of LiF-based solid electrolytes presents numerous benefits, including enhanced safety, superior performance at high temperatures, and longer battery lifespan. Additionally, this review spotlights key research developments and technological innovations that emphasize LiF's potential for future applications in diverse areas such as optics, catalysis, and biomedicine.