Used as a highly stable ionic liquid in electrochemical applications, particularly in lithium-ion batteries and supercapacitors due to its wide electrochemical window and excellent thermal stability. Its unique spirocyclic ammonium cation combined with the bis(trifluoromethanesulfonyl)imide anion provides low viscosity and high ionic conductivity, making it suitable for use as an electrolyte component in advanced energy storage systems. Also explored as a solvent and catalyst support in organic synthesis where strong acidity and non-nucleophilic environment are required. Resists decomposition under both acidic and oxidative conditions, enabling long-term use in demanding industrial processes.