The electrolyte for a lithium battery includes a non-aqueous organic solvent, a lithium salt, and an additive of the following Formula 1: ##STR00001## wherein, X is O or S, Y.sub.1, Y.sub.2, and Y.sub.3 are the same or different from each other and selected from O, S, CR.sub.2, and NR, where here R is H, a halogen, or an alkyl having a carbon number of less than or equal to 8, or neighboring alkyl groups are combined to each other to form a cycle or hetero cycle, and R.sub.a to R.sub.d are the same or different from each other and selected from H, a halogen, an alkoxy group having a carbon number of less than or equal to 8, and an unsaturated or saturated alkyl group having a carbon number of less than or equal to 8, or neighboring alkyl groups are combined to each other to form a cycle or hetero cycle.