Patent ID: 8372300

Claim:
An electrolytic solution containing an electrolyte and an additive of the formula (1) wherein A is —CH(X)— and X is halogen, alkyl having 1 to 4 carbon atoms, alkoxycarbonyl having 2 to 5 carbon atoms, benzoyl or alkoxycarbonylalkyl having 3 to 9 carbon atoms, Q 1 and Q 2 are the same or different and are each alkyl having 1 to 6 carbon atoms, alkoxyl having 1 to 4 carbon atoms, alkoxycarbonylalkyl having 3 to 9 carbon atoms or amino having as a substituent alkyl having 1 to 4 carbon atoms, or wherein A is —CH(X)— and X is hydrogen, Q 1 and Q 2 are the same or different and are each alkoxycarbonylalkyl having 3 to 9 carbon atoms or amino having as a substituent alkyl having 1 to 4 carbon atoms, or Q 1 is alkoxycarbonylalkyl having 3 to 9 carbon atoms and Q 2 is alkoxyl having 1 to 4 carbon atoms, or wherein A is —C═C(X)— and X is halogen, alkyl having 1 to 4 carbon atoms, alkoxycarbonyl having 2 to 5 carbon atoms, benzoyl or alkoxycarbonylalkyl having 3 to 9 carbon atoms, Q 1 and Q 2 are the same or different and are each alkyl having 1 to 6 carbon atoms, alkoxyl having 1 to 4 carbon atoms, alkoxycarbonylalkyl having 3 to 9 carbon atoms or amino having as a substituent alkyl having 1 to 4 carbon atoms, or wherein A is —C═C(X)— and X is hydrogen, Q 1 and Q 2 are the same or different and are each alkyl having 1 to 6 carbon atoms, alkoxycarbonylalkyl having 3 to 9 carbon atoms or amino having as a substituent alkyl having 1 to 4 carbon atoms, and A, Q 1 and Q 2 may form a ring structure.