NONAQUEOUS ELECTROLYTIC SOLUTION AND SECONDARY BATTERY CONTAINING THE SAME

There are disclosed a non-aqueous electrolyte which comprises a non-aqueous organic solvent and a lithium salt, and further contains a compound represented by the following formula (I): wherein X represents -O-, -S-, -CO- or -SO2, Y represents a single bond, -CH2-, -CH2-CH2-, -CH=CH- or -CO- and R to R each independently represent a hydrogen atom, an alkyl group, a phenyl group, or a halogen group, provided that X and Y do not represent -CO- at the same time..