Lithium tetrafluoroborate is widely used as an electrolyte salt in lithium-ion batteries due to its good thermal stability and ability to support lithium ion conduction. It helps improve battery performance, especially at elevated temperatures, and contributes to the formation of a stable solid electrolyte interphase (SEI) on the anode. It is also employed in some non-aqueous electrolyte systems for electrochemical capacitors and sensors. Additionally, it serves as a source of fluoride ions in certain organic synthesis reactions, particularly in catalysis and fluorination processes. Its low nucleophilicity and moderate solubility in polar aprotic solvents make it suitable for use in air- and moisture-sensitive reactions when handled under controlled conditions.