TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The Lewis acidic ligand is boron trifluoride, trimethyl borate, triphenylborane, tris(pentafluorophenyl)boron or tris(1,1,1,3,3,3-hexafluoropropan-2-yl) borate. The inorganic anion is hexafluorophosphate ion or tetrafluoroborate ion. The organic group is 1-10C carbon hydride group or halogenated 1-10C carbon hydride group. (I) is at least one of: 3H-imidazol-1-ium di-trifluorohydroborate; 2-methyl-imidazolium di-trifluorohydroborate; 2-trifluoromethyl-1H-imidazolium di-trifluorohydroborate; 4-methyl-3H-imidazol-1-ium di-trifluorohydroborate; 2-isopropyl-3H-imidazol-1-ium di-trifluorohydroborate; 2-(2,2,2-trifluoro-1-methyl-ethyl)-3H-imidazol-1-ium di-trifluorohydroborate; 2-isopropyl-4-methyl-3H-imidazol-1-ium di-trifluorohydroborate; 2-(1-ethyl-propyl)-2H-imidazol-1-ium di-trifluorohydroborate; 2H-benzoimidazol-1-ium di-trifluorohydroborate; 2-trifluoromethyl-2H-benzoimidazol-1-ium di-trifluorohydroborate; 2-sulfonate-2H-benzoimidazol-1-ium di-trifluorohydroborate; 3H-imidazol-1-ium bis(tris(pentafluorophenyl))hydroborate; 2-methyl-imidazolium bis(tris(pentafluorophenyl))hydroborate; 2-trifluoromethyl-1H-imidazolium bis(tris(pentafluorophenyl))hydroborate; 4-methyl-3H-imidazol-1-ium bis(tris(pentafluorophenyl))hydroborate; 2H-benzoimidazol-1-ium bis(tris(pentafluorophenyl))hydroborate; or 2-trifluoromethyl-2H-benzoimidazol-1-ium bis(tris(pentafluorophenyl))hydroborate. (II) is at least one of pyrrolidine-2,5-dione trifluorohydroborate or pyrrolidine-2,5-dione (tris(pentafluorophenyl))hydroborate. (III) is at least one of 1H-(1,2,4)triazolium tri(trifluorohydroborate) or 1H-(1,2,4)triazolium tris(tris(pentafluorophenyl))hydroborate). (IV) is at least one of pyrrolo(3,4-f)isoindole-1,3,5,7-tetraone di-trifluorohydroborate or pyrrolo(3,4-f)isoindole-1,3,5,7-tetraone bis(tris(pentafluorophenyl))hydroborate. (V) is at least one of bis(trifluoroborate) dimethylazanide, bis(trifluoroborate) bis(trifluoromethyl)azanide, bis(trifluoroborate) diethylazanide, bis(tris(pentafluorophenyl)) dimethylazanide, bis(tris(pentafluorophenyl)) bis(trifluoromethyl)azanide, or bis(tris(pentafluorophenyl)) diethylazanide. The organic anion is at a ratio of 0.001-0.5 mole per 1 mole of the inorganic anion, in the electrolytic solution. The anode comprises: as an anode active material, a carbon material, lithium metal or a material that is able to insert and extract the lithium ion and that has at least one of a metal element and a metalloid element as an element; or as an anode active material, a material having at least one of silicon and tin as an element.