NONAQUEOUS ELECTROLYTE, CAPACITOR DEVICE USING SAME, AND CARBOXYLIC ACID ESTER COMPOUND USED IN SAME
申请人:MU IONIC SOLUTIONS CORPORATION
公开号:US20210320334A1
公开(公告)日:2021-10-14
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 at a high voltage and further capable of inhibiting the gas generation while maintaining a capacity retention rate after storage at a high temperature and at a high voltage and also provides an energy storage device using the same. Disclosed is a nonaqueous electrolytic solution having an electrolyte salt dissolved in a nonaqueous solvent, the nonaqueous electrolytic solution containing a carboxylic acid ester compound represented by the following general formula (I).
In the formula, each of R
1
and R
2
independently represents a hydrogen atom, a —C(═O)—OR
4
group, or the like, and R
1
and R
2
may be bonded to each other to form a ring structure. R
3
represents a hydrogen atom or the like, and n represents an integer of 1 to 3. When n is 1, then L and R
4
represent an alkyl group having 1 to 6 carbon atoms or the like; and when n is 2 or 3, then L represents an n-valent connecting group, X represents a —C(═O)— group, an —S(═O)— group, an —S(═O)
2
— group, an —S(═O)
2
—R
5
—S(═O)
2
— group or a CR
6
R
7
group, R
5
represents an alkylene group having 1 to 4 carbon atoms, and each of R
6
and R
7
represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms.