1-ethyl-3-methylimidazoline bis (trifluoromethylsulfonyl) imine is an imidazole ionic liquid. Imidazole ionic liquids have low viscosity and high conductivity, with a maximum conductivity of 10-2S/cm, making them widely used. The ionic liquid of bis (trifluoromethyl) sulfonamide has the advantages of low viscosity, low melting point, and high conductivity due to the strong delocalization effect of fluorine substituents on negative charges, which weakens the hydrogen bonding of bis (trifluoromethyl) sulfonamide. Therefore, bis (trifluoromethyl) sulfonamide has become a widely studied anion. The ionic liquid composed of imidazole as cation and bis (trifluoromethyl) sulfonamide as anion combines the advantages of both and has good application prospects in lithium-ion batteries.