Patent ID: 8652682

Claim:
An electrolytic solution comprising: a solvent including 4-fluoro-1,3-dioxolane-2-one (FEC); and an electrolyte salt, wherein the electrolyte salt contains an ionic compound selected from the group consisting of [(2,2-bistrifluoromethyl)malonate oxalate]lithium borate, [bis(3,3,3-trifluoromethyl)glycolate oxalate]lithium borate, (2-trifluoromethylpropionate oxalate)lithium borate, (3,3,3-trifluoromethylpropionate oxalate)lithium borate, (difluoroaceto oxalate)lithium borate, (2,3,3,3-tetrafluoropropionate oxalate)lithium borate, (difluoromethanedisulfonate oxalate)lithium borate, and (difluorosulfoaceto oxalate)lithium borate, and wherein the structure of the ionic compound is asymmetric.