| 主权项 |
1. An electrolytic solution for a non-aqueous secondary battery comprising an electrolyte, a phosphazene compound, and an aprotic solvent,
wherein 20 vol % to 90 vol % of the aprotic solvent is composed of a halogen-containing compound having a carbonyl group and a halogen atom, the phosphazene compound is represented by the following formula (1); in the formula (1), R1 to R6 each independently represents a monovalent substituent; n represents an integer of 1 or more; and in the case where n is 2 or more, R5 and R6 may be different from each other, at least one of R1 to R6 is —NRARB, —N═RC, or an azide group: RA and RB each independently represents a hydrogen atom, an alkyl group, an aryl group, an alkenyl group, an alkynyl group, a heterocyclic group, a cyano group, a silyl group, or a substituent represented by the following formula (1A), (1B), (1C) or (1D), in the formula, R1A1, R1C1, R1D1, and R1D2 each independently represents an alkyl group, an alkoxy group, an aryl group, an aryloxy group, a halogen atom, or an amino group, R1B1 and R1B2 each independently represents a hydrogen atom, an alkyl group, an aryl group, an alkoxycarbonyl group, an aryloxycarbonyl group, an alkylsulfonyl group, an arylsulfonyl group, a silyl group, or a phosphonyl group, XA1 represents an oxygen atom or a sulfur atom, XD1 represents an oxygen atom, a sulfur atom, or a nitrogen atom: in the case where XD1 represents an oxygen atom or a sulfur atom, R1D3 is not present: in the case where XD1 represents a nitrogen atom, R1D3 represents an alkyl group, an aryl group, a silyl group, or a phosphonyl group, Rc represents a substituent represented by any one of the following formulae (C1) to (C6), in the formula, RX1, RX2, and RX3 each independently represents an alkyl group, an aryl group, an alkoxy group, an aryloxy group, an alkylthio group, an arylthio group, a heterocyclic group, a halogen atom, or a silyl group, RY1 and RY2 each independently represent a halogen atom. |
