Cyclobutenedione derivative, nonaqueous electrolytic solution, and lithium ion secondary battery

A nonaqueous electrolytic solution comprising:

• a nonaqueous solvent, an electrolyte salt, and a cyclobutenedione derivative represented by the following general formula (1):
• wherein in the general formula (1), R1 is a group selected from the group consisting of a vinyl group, an allyl group, a 1-propenyl group, an isopropenyl group, an ethynyl group, a phenylethynyl group, and a trimethylsilylethynyl group, and
• wherein in the general formula (1), R2 is a group selected from the group consisting of a phenyl group, a methyl group, an ethyl group, a methoxy group, an ethoxy group, an isopropoxy group, a 4-fluorophenyl group, a 2,4-difluorophenyl group, a pentafluorophenyl group, a tolyl group, a 4-methylthiophenyl group, a 2-thienyl group, a 2-furanyl group, an alkylthio group having 1-3 carbon atoms, and a phenylthio group.