A liquid electrolyte for electrical storage devices comprises an ionic liquid having general formula (1) below and a melting point of up to 50°C wherein R 1 and R 4 are each independently an alkyl of 1 to 5 carbons or an alkoxyalkyl of the formula R'-0-(C...

Secondary cells and electrical double-layer capacitors of excellent charge-discharge efficiency, stability and low-temperature properties can be obtained using nonaqueous electrolytes which contain an ionic liquid that has general formula (1) below and is ...

A nonaqueous electrolyte which contains an ionic liquid having general formula (1) below and a melting point not higher than 50 DEG C, a compound which reductively decomposes at a more noble potential than the ionic liquid, and a lithium salt. In formula (...

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 st...