Lithium iodide (LiI) is a specialty chemical valued for its high ionic conductivity, thermal stability, and hygroscopic nature. It is widely used as an electrolyte in high-temperature, solid-state, and thermal batteries, providing reliable performance and long shelf life under extreme conditions, such as in aerospace and military applications. Due to its moisture sensitivity, it is employed in humidity indicators that change color upon exposure to water vapor. In organic synthesis, LiI serves as a catalyst or reagent, particularly in iodination reactions and carbon-carbon bond formation. Additionally, it is utilized in radiation detectors for gamma and X-rays, often doped with cerium to improve scintillation efficiency. LiI also finds applications in photovoltaic research, such as in dye-sensitized solar cells, and in advanced ceramic materials requiring high ionic conductivity at elevated temperatures.