IONIC LIQUIDS, ELECTROLYTE SALTS FOR ELECTRICAL STORAGE DEVICES, LIQUID ELECTROLYTES FOR ELECTRICAL STORAGE DEVICES, ELECTRICAL DOUBLE-LAYER CAPACITORS, AND SECONDARY BATTERIES

摘要

Electrical storage devices having excellentlow-temperature properties can be obtained by using aquaternary salt (or ionic liquid) of general formula (1)below as an electrolyte salt for electrical storage devicesor a liquid electrolyte for electrical storage devices.(see formula 1)In formula (1), R1 to R4 are each independently an alkyl groupof 1 to 5 carbons or an alkoxyalkyl group of the formulaR'-O-(CH2)n-, with the proviso that at least one group fromamong R1 to R4 is the above alkoxyalkyl group. X is anitrogen or phosphorus atom, and Y is a monovalent anion.