IONIC LIQUIDS HAVING BISFLUOROSULFONYLIMIDE ANION FOR ELECTROLYTE

摘要

PURPOSE: An ionic liquid for electrolyte is provided to have excellent thermal stability, low melting point, and excellent electric conductivity, and to provide electrolyte for a battery with high power, light weight, a low production cost, and long lifetime. CONSTITUTION: An ionic liquid for electrolyte comprises bisfluorosulfonylimide as an anion; and one selected from imidazolium, pyrrolidinium, ammonium, and piperidinium. The ionic liquid contains 10 ppm or less of halide. The electric conductivity, melting point, and thermal stability are 3.72 mS/cm or more, (-50)-143 deg. C, and 263-334 deg. C, respectively. The electrolyte is an electrolyte for a lithium battery, an electrochemical apparatus, an ultracapacitor, or a battery light-emitting cell.