Nonaqueous electrolytic solution and nonaqueous electrolyte secondary battery

摘要

Provided are a nonaqueous electrolyte solution having improved durability properties in terms of cycling, storage and the like and improved discharge characteristic at a high current density, and a nonaqueous electrolyte battery that uses that nonaqueous electrolyte solution. The nonaqueous electrolyte solution containing a lithium salt and a nonaqueous solvent that dissolves the lithium salt, wherein the nonaqueous electrolyte solution contains a compound represented by formula (1) and at least one compound selected from the group consisting of a compound having a cyano group, a cyclic ester compound having a sulfur atom and a compound having an isocyanate group.;

主权项

1. A nonaqueous electrolyte solution, comprising a lithium salt and a nonaqueous solvent that dissolves the lithium salt, wherein the nonaqueous electrolyte solution comprises 0.001 to 30 wt % of a compound represented by formula (1) and 0.001 to 5 wt % of a compound having a cyano group represented by formula (3): wherein X and Z, which may be identical or different, represent CR′2, C═O, C═N—R′, C═P—R′, O, S, N—R′ and P—R′; Y represents CR12, C═O, S═O, S(═O) P(═O)—R2 and P(═O)—OR3; R and R1, which may be identical or different, are each hydrogen, a halogen, a C1 to C20 saturated aliphatic hydrocarbon group optionally having a halogen atom, a C1 to C20 unsaturated aliphatic hydrocarbon group optionally having a halogen atom, or a C1 to C20 aromatic hydrocarbon group optionally having a halogen atom; R2 is a C1 to C20 saturated aliphatic hydrocarbon group optionally having a halogen atom, a C1 to C20 unsaturated aliphatic hydrocarbon group optionally having a halogen atom, or a C1 to C20 aromatic hydrocarbon group optionally having a halogen atom; R3 is Li, NR44, a C1 to C20 saturated aliphatic hydrocarbon group optionally having a halogen atom, a C1 to C20 unsaturated aliphatic hydrocarbon group optionally having a halogen atom, or a C1 to C20 aromatic hydrocarbon group optionally having a halogen atom; R4 are mutually identical or different and are a C1 to C20 saturated aliphatic hydrocarbon group optionally having a halogen atom, a C1 to C20 unsaturated aliphatic hydrocarbon group optionally having a halogen atom, or a C1 to C20 aromatic hydrocarbon group optionally having a halogen atom; and n and m are 0 or 1; wherein adjacent endocyclic carbons may form further bonds with each other, whereupon respective R of the carbons is decreased by one; and W is hydrogen, a halogen, a C1 to C20 saturated aliphatic hydrocarbon group optionally having a halogen atom, a C1 to C20 unsaturated aliphatic hydrocarbon group optionally having a halogen atom, or a C1 to C20 aromatic hydrocarbon group optionally having a halogen atom, wherein U is a C1 to C10 V-valent organic group comprising an atom selected from the group consisting of carbon atom, hydrogen atom, nitrogen atom, oxygen atom, sulfur atom, phosphorus atom and halogen atom; and V is an integer from 1 to 3
A(-NCO)n′  (5).