Patent ID: 7099146
Filing Date: 2006-08-29
Classification: H01G,Y02E

Abstract:
1. An electrolyte for an electrochemical capacitor comprising a cyclic amidinium salt (B) represented by the general formula (1), wherein the total amount of a cyclic amidinium salt derivative (A) represented by the general formula (2) is not larger than 10 mole % relative to the sum of (A) and (B): [In the formula, R 1 represents a hydrogen atom or a hydrocarbon group containing 1 to 20 carbon atoms, which may optionally have a hydroxyl group(s), R 2 represents a hydrocarbon group containing 1 to 10 carbon atoms, which may optionally have a hydroxyl group, amino group, nitro group, cyano group, formyl group and/or ether bond-containing group(s), and the two R 2 groups may be the same or different, Q represents an alkylene, arylene or alkenylene group containing 2 to 10 carbon atoms, which may optionally have a hydrocarbon group containing 1 to 5 carbon atoms, an amino, nitro, cyano or formyl group(s), and X − represents a counter anion; the part or whole of the R 1 and R 2 moieties may be bound together to form a ring]; [In the formula, R 3 represents a hydrogen atom or a hydrocarbon group containing 1 to 20 carbon atoms, which may be substituted with a hydroxyl group(s), R 4 represents a hydrocarbon group containing 1 to 10 carbon atoms, which may have a hydroxyl, amino, nitro, cyano, formyl and/or ether bond-containing group(s), and the two R 4 groups may be the same or different; Q represents an alkylene, arylene or alkenylene group containing 2 to 10 carbon atoms, which may optionally have a hydrocarbon group containing 1 to 5 carbon atoms, an amino, nitro, cyano or formyl group(s), and there are cases where there is X − or there is no X − and, when there is X − , it represents a counter anion, and each Y represents a carboxyl group or an —OCO 2 H and, when there is no X − , each Y represents a carboxyl group, a carboxyl anion group, an —OCO 2 H or —CO 2 − group and one Y represents a carboxyl anion or an —OCO 2 − group; n represents an integer of 1 to 20; the part or whole of the R 3 and R 4 moieties may be bound together to form a ring].