| 摘要 |
The present invention provides a non-aqueous electrolyte and an electricity storage device. The non-aqueous electrolyte is capable of improving electrochemical characteristics when the electricity storage device is used at a high temperature, and is also capable of suppressing the generation of gas as well as the capacity retention after high-temperature cycling. The non-aqueous electrolyte is used in the electricity storage device. A non-aqueous electrolyte in which an electrolyte salt is dissolved in a non-aqueous solvent, the non-aqueous electrolyte characterized in containing a phenyl ester compound represented by formula (I) (in the formula, Rf represents a C1-6 fluoroalkyl, X represents a halogen atom, p and q represent integers 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, hydrogen, alkyl, alkenyl, alkynyl or an aryl; L1 represents an alkylene, alkenylene, alkynylene, or a direct bonding; L2 represents an alkylene, and R represents an alkyl; Y can be a fluorine only when A is -S(=O)2-; and Y can be a hydrogen only when A is -C(=O)-; and at least one hydrogen in each of the alkyl, alkenyl, alkynyl, aryl, alkylene, alkenylene, and alkynylene groups may be substituted by a halogen). |
