Patent ID: 7312000

Claim:
An electrolytic solution for a secondary battery comprising a solvent and a compound which has a diazine N,N′-dioxide structure expressed by general formula (1): in which n, m, n′, and m′ each independently denote an integer 0 (zero) or larger; the diazine rings and the benzene rings may be condensed alternately or randomly; and substituents R 1 , R 2 , R 3 , R 4 , R a , R b , R c , and R d each independently represent a hydrogen atom, a halogen atom, a hydroxyl group, a nitro group, a nitroso group, a cyano group, a carboxyl group, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted amino group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryloxy group, a substituted or unsubstituted alkoxycarbonyl group, a substituted or unsubstituted aryloxycarbonyl group, and a substituted or unsubstituted acyl group, wherein: when n is 2 or larger, then R a and R b may be the same or different; and when n′ is 2 or larger, then R c and R d may be the same or different, and wherein: in these substituents, one or more of the atoms may be substituted with one or more sulfur atoms, silicon atoms, phosphorus atoms or boron atoms; and the substituents may form a ring structure in cooperation with each other; and wherein the solvent comprises an organic solvent in which a lithium salt is dissolved.