NONAQUEOUS ELECTROLYTE, ELECTRICAL DOUBLE LAYER CAPACITORS, AND NONAQUEOUS ELECTROLYTE SECONDARY CELLS

摘要

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 liquid at not higher than 50 DEG C and an ion-conductive polymer. 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- (R' being methyl or ethyl, and the letter n being an integer from 1 to 4), and any two from among R<1>, R<2>, R<3> and R<4> may together form a ring, with the proviso that at least one of R<1> to R<4> is an alkoxyalkyl group of the above formula. X is a nitrogen atom or a phosphorus atom, and Y is a monovalent anion.