| 摘要 |
The present invention provides a nonaqueous electrolytic solution capable of improving electrochemical characteristics at high temperatures and further capable of not only improving a capacity retention rate after a high-temperature cycle test but also decreasing a rate of increase of an electrode thickness, and also to provide an energy storage device using the same. A nonaqueous electrolytic solution having an electrolyte salt dissolved in a nonaqueous solvent, the nonaqueous electrolytic solution containing from 0.001 to 5% by mass of a diisocyanate compound represented by OCN-L-NCO (in the formula, L represents an alkylene group having from 4 to 12 carbon atoms) and further containing from 0.001 to 5% by mass of at least one selected from a specified phosphoric acid ester compound, a specified cyclic sulfonic acid ester compound, a specified isocyanate compound having an ester structure, and a specified triple bond-containing compound, and an energy storage device using the same, are disclosed. |
| 主权项 |
1: A nonaqueous electrolytic solution having an electrolyte salt dissolved in a nonaqueous solvent, the nonaqueous electrolytic solution comprising from 0.001 to 5% by mass of a diisocyanate compound represented by the following general formula (I) and further comprising from 0.001 to 5% by mass of at least one selected from a phosphoric acid ester compound represented by the following general formula (II), a cyclic sulfonic acid ester compound represented by the following general formula (III), an isocyanate compound having an ester structure and represented by the following general formula (IV), and a triple bond-containing compound represented by the following general formula (V):
OCN-L-NCO (I) wherein
L represents an optionally branched alkylene group having from 4 to 12 carbon atoms, wherein
each of R1 and R2 independently represents an alkyl group having from 1 to 6 carbon atoms or a halogenated alkyl group having from 1 to 6 carbon atoms, in which at least one hydrogen atom is substituted with a halogen atom; R3 represents an alkyl group having from 1 to 6 carbon atoms, an alkenyl group having from 2 to 6 carbon atoms, or an alkynyl group having from 3 to 6 carbon atoms; and each of R4 and R5 independently represents a hydrogen atom, a halogen atom, or an alkyl group having from 1 to 4 carbon atoms, wherein
each of R6 and R7 independently represents a hydrogen atom, an alkyl group having from 1 to 6 carbon atoms, in which at least one hydrogen atom may be substituted with a halogen atom, or a halogen atom; X represents —CH(OR8)— or —C(═O)—; R8 represents a formyl group, an alkyl carbonyl group having from 2 to 7 carbon atoms, an alkenyl carbonyl group having from 3 to 7 carbon atoms, an alkynyl carbonyl group having from 3 to 7 carbon atoms, or an aryl carbonyl group having from 7 to 13 carbon atoms; and at least one hydrogen atom in R8 may be substituted with a halogen atom, wherein
R9 represents an alkyl group having from 1 to 6 carbon atoms, an alkenyl group having from 2 to 6 carbon atoms, an aryl group having from 6 to 12 carbon atoms, an alkyloxy group having from 1 to 6 carbon atoms, an alkenyloxy group having from 2 to 6 carbon atoms, an isocyanatoalkyloxy group having from 2 to 6 carbon atoms, or an aryloxy group having from 6 to 12 carbon atoms, in each of which at least one hydrogen atom may be substituted with a halogen atom; and Y represents a linear or branched alkylene group having from 1 to 6 carbon atoms, in which at least one hydrogen atom may be substituted with a halogen atom, or a divalent linking group having from 2 to 6 carbon atoms and containing at least one ether bond, and
Z—O—CH2—C≡C—W (V) wherein
Z represents R10—O—C(═O)—, R11—O—C(═O)—C(═O)—, or R12—S(═O)2—; W represents a hydrogen atom or —CH2—O—S(═O)2—R13; each of R10 to R13 independently represents an alkyl group having from 1 to 6 carbon atoms, an alkenyl group having from 2 to 6 carbon atoms, an alkynyl group having from 2 to 6 carbon atoms, or an aryl group having from 6 to 12 carbon atoms, in each of which at least one hydrogen atom may be substituted with a halogen atom, provided that when Z is R10—O—C(═O)— or R11—O—C(═O)—C(═O)—, then W is a hydrogen atom. |
