Non-aqueous electrolyte solution and electricity-storage device using same

摘要

The present invention provides a nonaqueous electrolytic solution capable of improving electrochemical characteristics at high temperatures, which comprises at least one organic phosphorus compound represented by the following general formula (I), an energy storage device using the nonaqueous electrolytic solution, and a specific organic phosphorus compound.;
(In the formula, R1 and R2 each independently represent an alkyl group, a cycloalkyl group, an alkenyl group, an alkynyl group, an alkoxy group, a cycloalkoxy group, an alkenyloxy group, an alkynyloxy group, a halogenoalkyl group, a halogenoalkoxy group, an aryl group, or an aryloxy group; R3 and R4 each independently represent a hydrogen atom, a halogen atom, or an alkyl group; m is an integer of from 1 to 4, n is 0 or 1, q is 1 or 2. When q is 1 and n is 0, X represents an alkoxy group, an alkynyloxy group, an alkyloxyalkoxy group, an aryloxy group, etc.; when q is 1 and n is 1, X represents an alkyl group, an alkynyl group, an alkoxy group, an alkynyloxy group, an alkyloxyalkoxy group, etc.; and when q is 2, X represents —O-L3-O—, —OC(═O)—C(═O)O—, or a single bond.)

主权项

1. A nonaqueous electrolytic solution, comprising:
an electrolyte salt dissolved in a non-aqueous solvent, and an organic phosphorus compound of formula (I): wherein R1 and R2 each independently represent an alkyl group comprising from 1 to 6 carbon atoms, a cycloalkyl group comprising from 3 to 6 carbon atoms, an alkenyl group comprising from 2 to 6 carbon atoms, an alkynyl group comprising from 3 to 6 carbon atoms, an alkoxy group comprising from 1 to 6 carbon atoms, a cycloalkoxy group comprising from 3 to 6 carbon atoms, an alkenyloxy group comprising from 2 to 6 carbon atoms, an alkynyloxy group comprising from 3 to 6 carbon atoms, a halogenoalkyl group comprising from 1 to 6 carbon atoms, a halogenoalkoxy group comprising from 1 to 6 carbon atoms, an aryl group comprising from 6 to 12 carbon atoms in which at least one hydrogen atom is optionally substituted with a halogen atom, or an aryloxy group comprising from 6 to 12 carbon atoms in which at least one hydrogen atom is optionally substituted with a halogen atom; when R1 and R2 each are an alkyl group or an alkoxy group, R1 and R2 optionally bond to form a cyclic structure; R3 and R4 each independently represent a hydrogen atom, a halogen atom, or an alkyl group comprising from 1 to 4 carbon atoms; m represents an integer of from 1 to 4; n represents 0 or 1, q represents 1 or 2, and n, q and X satisfy:
when q is 1 and n is 0, X represents an alkoxy group comprising from 1 to 6 carbon atoms, an alkynyloxy group comprising from 3 to 6 carbon atoms, an alkyloxyalkoxy group comprising from 2 to 6 carbon atoms, an aryloxy group comprising from 6 to 12 carbon atoms in which at least one hydrogen atom is substituted with a halogen atom, —O—L1—OC(═O)—C(═O)—OR5, —O—L2—C(═O)—OR5, or —O—L5—CN, provided that i) when q is 1, n is 0 and X is an alkoxy group comprising from 1 to 6 carbon atoms, R1 and R2 bond to form a cyclic structure, and ii) when q is 1, n is 0 and X is an aryloxy group comprising from 6 to 12 carbon atoms in which at least one hydrogen atom is substituted with a halogen atom, R3 and R4 are both hydrogen atoms;when q is 1 and n is 1, X represents an alkyl group comprising from 1 to 6 carbon atoms, an alkynyl group comprising from 2 to 6 carbon atoms, an alkoxy group comprising from 1 to 6 carbon atoms, an alkynyloxy group comprising from 3 to 6 carbon atoms, an alkyloxyalkoxy group comprising from 2 to 6 carbon atoms, or —C(═O)—OR5; andwhen q is 2, X represents —O—L3—O—, —OC(═O)—C(═O)O— or a single bond; R5 represents an alkyl group comprising from 1 to 6 carbon atoms; L1 and L3 each represent an alkylene group comprising from 2 to 6 carbon atoms, or an alkynylene group comprising from 4 to 8 carbon atoms; and L2 and L5 each represent an alkylene group comprising from 1 to 6 carbon atoms.