| abstract |
An 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), R1-R4 are each independently an alkyl group of 1 to 5 carbons or an alkoxyalkyl group of the formula R'-O-(CH2)n-, N is the integer from 1 to 4; any two of the R1, R2, R3, R4 can form a ring; the proviso that at least one group from among R1-R4 is the above alkoxyalkyl group; X is a nitrogen or phosphorus atom, and Y is a monovalent anion. |