IONIC LIQUID, ELECTROLYTE SALT FOR STORAGE DEVICE, ELECTROLYTIC SOLUTION FOR STORAGE DEVICE, ELECTRIC DOUBLE LAYER CAPACITOR, AND SECONDARY BATTERY

摘要

Electrical storage devices having excellent low-temperature properties can be obtained by using a quaternary salt (or ionic liquid) of general formula (1) below as an electrolyte salt for electrical storage devices or a liquid electrolyte for electrical storage devices. In formula (1), R<1> to R<4> are each independently an alkyl group of 1 to 5 carbons or an alkoxyalkyl group of the formula R'-O-(CH2)n-, with the proviso that at least one group from among R<1> to R<4> is the above alkoxyalkyl group. X is a nitrogen or phosphorus atom, and Y is a monovalent anion.