Nonaqueous electrolytic solution and nonaqueous electrolyte secondary battery using the same

摘要

A nonaqueous electrolytic solution which may suppress the overcharge of a battery and a nonaqueous electrolyte secondary battery using the solution are provided. The overcharge of the battery is suppressed by undergoing the electrolytic polymerization in the solution when the battery is overcharged, and simultaneously more effectively suppressed by increasing the internal resistance of the battery. The nonaqueous electrolytic solution comprises a polymer which undergoes the electrolytic polymerization in the range of 4.3V or more to 5.5V or less at the lithium metal standard voltage, having a repeating unit represented by the formula (1), an electrolytic salt and a nonaqueous solvent.;[where, A is a functional group which undergoes the electrolytic polymerization in the range of 4.3V or more to 5.5V or less at the lithium metal standard voltage, R and R′ are each independently an hydrogen atom or a methyl group]

主权项

1. A nonaqueous electrolytic solution comprising:
a polymer which undergoes electrolytic polymerization in the range of 4.3V or more to 5.5V or less at the lithium metal standard voltage, having a repeating unit represented by formula (1); an electrolytic salt; and a nonaqueous solvent, where A is a functional group which undergoes electrolytic polymerization in the range of 4.3V or more to 5.5V or less at the lithium metal standard voltage, comprising:
an electrolytic polymerization functional group having an aromatic functional group; anda bonding group comprising a bond binding the aromatic functional group of the electrolytic polymerization functional group to the repeating unit, the bond binding the aromatic function group to the repeating unit selected from the group consisting of an ether bond and an ester bond, and where R and R′ are each independently selected from the group consisting of a hydrogen atom and a methyl group.