Ionic liquid, nonaqueous electrolyte, and power storage device

摘要

A nonaqueous electrolyte of the present invention includes an ionic liquid including a first alicyclic quaternary ammonium cation having one or more substituents, a second alicyclic quaternary ammonium cation having an alicyclic skeleton that is the same as an alicyclic skeleton of the first alicyclic quaternary ammonium cation, and a counter anion to the first alicyclic quaternary ammonium cation and the second alicyclic quaternary ammonium cation and an alkali metal salt. In the second alicyclic quaternary ammonium cation, one of substituents bonded to a nitrogen atom in the alicyclic skeleton is a substituent including a halogen element. In the ionic liquid, the amount of a salt including the second alicyclic quaternary ammonium cation is less than or equal to 1 wt % per unit weight of the ionic liquid, or is less than or equal to 0.8 wt % per unit weight of the nonaqueous electrolyte.

主权项

1. An ionic liquid comprising:
an alicyclic quaternary ammonium cation represented by General Formula (G1); an alicyclic quaternary ammonium cation represented by General Formula (G2); and an anion selected from any of a monovalent imide-based anion, a monovalent methide-based anion, a perfluoroalkyl sulfonic acid anion, tetrafluoroborate, and hexafluorophosphate, wherein an amount of a salt including the alicyclic quaternary ammonium cation represented by General Formula (G2) is more than 0 wt % and less than or equal to 1 wt % per unit weight of a salt including the alicyclic quaternary ammonium cation represented by General Formula (G1) and the salt including the alicyclic quaternary ammonium cation represented by General Formula (G2), wherein, in Chemical Formula 1, R1 to R5 each represent a hydrogen atom or an alkyl group having 1 to 20 carbon atoms, wherein, in Chemical Formula 2, R1 to R5 each represent a hydrogen atom or an alkyl group having 1 to 20 carbon atoms.