Succinonitrile is widely used as an electrolyte additive in lithium-ion batteries to enhance their performance and safety. It helps stabilize the electrolyte, preventing decomposition at high voltages, and improves the battery's cycle life. Additionally, it is utilized in organic synthesis as a precursor for various chemicals, including pharmaceuticals and agrochemicals. Its high dielectric constant also makes it suitable for use in electrochemical applications and as a solvent in specialized reactions.