| 主权项 |
1. A nonaqueous electrolyte solution, comprising:
a lithium salt; at least one oxo-acid ester derivative of phosphorus selected from halogen-substituted phosphate esters represented by formula (1) and compounds represented by the formulae (2) to (3); and at least one linear disulfonate ester represented by the formula (5); and 0.5% by mass or more and 20% by mass or less of a cyclic carbonate ester containing a halogen: in the formula (1), R11, R12 and R13 each independently represent any group selected from an alkyl group, an aryl group, an alkenyl group, a cyano group, a phenyl group, an amino group, a nitro group, an alkoxy group and a cycloalkyl group, and a halogen-substituted group thereof; where any two or all of R11, R12 and R13 may be bonded to form a cyclic structure, and where at least one of R11, R12 or R13 is a halogen-substituted group; in the formula (2), R21 and R22 each independently represent any group selected from an alkyl group, an aryl group, an alkenyl group, a cyano group, a phenyl group, an amino group, a nitro group, an alkoxy group and a cycloalkyl group, and a halogen-substituted group thereof; R21 and R22 may be bonded to form a cyclic structure; and X21 represents a halogen atom,in the formula (3), R31 represents any group selected from an alkyl group, an aryl group, an alkenyl group, a cyano group, a phenyl group, an amino group, a nitro group, an alkoxy group and a cycloalkyl group, and a halogen-substituted group thereof; and X31 and X32 each independently represent a halogen atom,in the formula (5), R1 and R4 each independently represent an atom or a group selected from a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 5 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 5 carbon atoms, a substituted or unsubstituted fluoroalkyl group having 1 to 5 carbon atoms, a polyfluoroalkyl group having 1 to carbon atoms, —SO2X11, where X11 is a substituted or unsubstituted alkyl group having 1 to 5 carbon atoms, —SY11, where Y11 is a substituted or unsubstituted alkyl group having 1 to 5 carbon atoms, —COZ, where Z is a hydrogen atom or a substituted or unsubstituted alkyl group having 1 to 5 carbon atoms, and a halogen atom; and R2 and R3 each independently represent an atom or a group selected from a substituted or unsubstituted alkyl group having 1 to 5 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 5 carbon atoms, a substituted or unsubstituted phenoxy group, a substituted or unsubstituted fluoroalkyl group having 1 to 5 carbon atoms, a polyfluoroalkyl group having 1 to 5 carbon atoms, a substituted or unsubstituted fluoroalkoxy group having 1 to 5 carbon atoms, a polyfluoroalkoxy group having 1 to 5 carbon atoms, a hydroxyl group, a halogen atom, —NX12X13, where X12 and X13 are each independently a hydrogen atom or a substituted or unsubstituted alkyl group having 1 to 5 carbon atoms, and —NY12CONY13Y14, where Y12 to Y14 are each independently a hydrogen atom or a substituted or unsubstituted alkyl group having 1 to 5 carbon atoms. |
