LiI, or lithium iodide, is a chemical compound composed of lithium and iodine. It appears as a white crystalline solid and is often used in various applications, including as a reagent in organic synthesis and in the production of lithium batteries. Its unique properties make it valuable in both industrial and research settings. In addition to its chemical uses, LiI is also known for its role in photovoltaic cells and nuclear medicine. It can help improve the efficiency of solar panels and is sometimes used in radiopharmaceuticals for diagnostic imaging.