Ionic liquids such as 1-methyl-3-ethylimidazolium BF4 were first introduced by J.S. Wilkes and M.J. Zaworotko in *Chem. Commun.* (1992, p. 965)
                             subsequently, product development proceeded in the field of electrochemical devices using these known materials, and they rapidly gained prominence
                             recognized for their compositional characteristics as a "green chemistry" solution?following the publication of the volume *Ionic Liquids: Industriala
                             Applications to Green Chemistry

　　           　　・It is a salt in a liquid state composed solely of ions that has a melting point near room temperature (room-temperature molten salt).
　　           　　・A liquid composed solely of ions remains liquid over a wide temperature range and has a vapor pressure of virtually zero.
　　           　　・It does not evaporate even at high temperatures. Despite being solvent-free, it has relatively low viscosity
                 　    ・Since salt has a high specific heat capacity, it can also be used as a heat transfer medium.
　　           　　・It exhibits a high decomposition voltage and extremely high ionic conductivity, making it a promising material for use as an
                       　electrolyte solution in the field of electrochemistry.
　　           　　・As a highly safe green chemistry product that is environmentally friendly, it contributes to environmental conservation.