NON-AQUEOUS ELECTROLYTE AND ELECTRICITY STORAGE DEVICE

摘要

The present invention provides a nonaqueous electrolytic solution capable of improving electrochemical characteristics in the case of using an energy storage device at a high temperature and further capable of inhibiting the gas generation as well as a capacity retention rate after a high-temperature cycle, and also to provide an energy storage device using the same. Disclosed are a nonaqueous electrolytic solution having an electrolyte salt dissolved in a nonaqueous solvent, the nonaqueous electrolytic solution containing a phenyl ester compound represented by the following general formula (I), and an energy storage device.;;(In the formula, Rf represents a fluoroalkyl group having 1 to 6 carbon atoms; X represents a halogen atom; each of p and q is an integer of 1 to 4; and (p+q) is 5 or less. A has a structure represented by —S(═O)2—, —C(═O)—, —C(═O)—O—, —C(═O)-L1-C(═O)—, —C(═O)-L2-P(═O)(OR)—O—, or —P(═O)(OR)—O—. Y represents a fluorine atom, a hydrogen atom, an alkyl group, an alkenyl group, an alkynyl group, or an aryl group; L1 represents an alkylene group, an alkenylene group, an alkynylene group, or a direct bond; L2 represents an alkylene group; and R represents an alkyl group. However, only when A is —S(═O)2—, Y may be a fluorine atom; and only when A is —C(═O)—, Y may be a hydrogen atom. At least one hydrogen atom in each group of the aforementioned alkyl group, alkenyl group, alkynyl group, aryl group, alkylene group, alkenylene group, and alkynylene group may be substituted with a halogen atom.)

主权项

1. A nonaqueous electrolytic solution having an electrolyte salt dissolved in a nonaqueous solvent, the nonaqueous electrolytic solution comprising a phenyl ester compound represented by the following general formula (I), in which the benzene ring is substituted with both a halogen atom and a fluoroalkyl group: wherein Rf represents a fluoroalkyl group having 1 to 6 carbon atoms; X represents a halogen atom; each of p and q is an integer of 1 to 4; (p+q) is 5 or less; A has a structure represented by —S(═O)2—, —C(═O)—, —C(═O)—O—, —C(═O)-L1-C(═O)—, —C(═O)-L2-P(═O)(OR)—O—, or —P(═O)(OR)—O—; Y represents a fluorine atom, a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, an alkenyl group having 2 to 6 carbon atoms, an alkynyl group having 3 to 6 carbon atoms, or an aryl group having 6 to 12 carbon atoms; L1 represents an alkylene group having 1 to 8 carbon atoms, an alkenylene group having 2 to 8 carbon atoms, an alkynylene group having 2 to 8 carbon atoms, or a direct bond; L2 represents an alkylene group having 1 to 8 carbon atoms; and R represents an alkyl group having 1 to 6 carbon atoms, provided that only when A is —S(═O)2—, Y may be a fluorine atom; and only when A is —C(═O)—, Y may be a hydrogen atom, and wherein at least one hydrogen atom in each group of the alkyl group, the alkenyl group, the alkynyl group, the aryl group, the alkylene group, the alkenylene group, and the alkynylene group may be substituted with a halogen atom.