An electrolyte for a lithium battery, comprising: a nonaqueous organic solvent, a lithium salt, a first compound represented by Formula 1 below, and a second compound represented by Formula 2 below: Formula 1 Q 1 -O-Q 2 wherein, Q 1 is a C 2 -C 30 alkyl group substituted with one or more fluorine atoms; Q 2 is a C 1 -C 30 alkyl group, a C 2 -C 30 alkenyl group, a C 2 -C 30 alkynyl group, a C 1 -C 30 alkyl group substituted with one or more fluorine atoms, a C 2 -C 30 alkenyl group substituted with one or more fluorine atoms, or a C 2 -C 30 alkynyl group substituted with one or more fluorine atoms; R 1 through R 6 in the second compound are each independently selected from the group consisting of a fluorine atom and -OT 1, wherein T 1 is a C 1 -C 10 alkyl group; a C 2 -C 10 alkenyl group; a C 6 -C 14 aryl group; a C 1 -C 10 alkyl group substituted with at least one fluorine atom; a C 2 -C 10 alkenyl group substituted with at least one fluorine atom; or a C 6 -C 14 aryl group substituted with at least one fluorine atom, with the proviso that R 1 through R 6 cannot all be simultaneously fluorine atoms or all be simultaneously -OT 1 wherein the number ratio of fluorine atoms to hydrogen atoms in the first compound is 1 or above, and characterized in that the amount of the first compound is in the range of from 10 parts by volume to 30 parts by volume based on 100 parts by volume of the total volume of the nonaqueous organic solvent, the first compound, and the second compound. a nonaqueous organic solvent, a lithium salt, a first compound represented by Formula 1 below, and a second compound represented by Formula 2 below: Formula 1 Q 1 -O-Q 2 wherein, Q 1 is a C 2 -C 30 alkyl group substituted with one or more fluorine atoms; Q 2 is a C 1 -C 30 alkyl group, a C 2 -C 30 alkenyl group, a C 2 -C 30 alkynyl group, a C 1 -C 30 alkyl group substituted with one or more fluorine atoms, a C 2 -C 30 alkenyl group substituted with one or more fluorine atoms, or a C 2 -C 30 alkynyl group substituted with one or more fluorine atoms; R 1 through R 6 in the second compound are each independently selected from the group consisting of a fluorine atom and -OT 1, wherein T 1 is a C 1 -C 10 alkyl group; a C 2 -C 10 alkenyl group; a C 6 -C 14 aryl group; a C 1 -C 10 alkyl group substituted with at least one fluorine atom; a C 2 -C 10 alkenyl group substituted with at least one fluorine atom; or a C 6 -C 14 aryl group substituted with at least one fluorine atom, with the proviso that R 1 through R 6 cannot all be simultaneously fluorine atoms or all be simultaneously -OT 1 Q 1 is a C 2 -C 30 alkyl group substituted with one or more fluorine atoms; Q 2 is a C 1 -C 30 alkyl group, a C 2 -C 30 alkenyl group, a C 2 -C 30 alkynyl group, a C 1 -C 30 alkyl group substituted with one or more fluorine atoms, a C 2 -C 30 alkenyl group substituted with one or more fluorine atoms, or a C 2 -C 30 alkynyl group substituted with one or more fluorine atoms; R 1 through R 6 in the second compound are each independently selected from the group consisting of a fluorine atom and -OT 1, wherein T 1 is a C 1 -C 10 alkyl group; a C 2 -C 10 alkenyl group; a C 6 -C 14 aryl group; a C 1 -C 10 alkyl group substituted with at least one fluorine atom; a C 2 -C 10 alkenyl group substituted with at least one fluorine atom; or a C 6 -C 14 aryl group substituted with at least one fluorine atom, with the proviso that R 1 through R 6 cannot all be simultaneously fluorine atoms or all be simultaneously -OT 1 wherein the number ratio of fluorine atoms to hydrogen atoms in the first compound is 1 or above, and characterized in that the amount of the first compound is in the range of from 10 parts by volume to 30 parts by volume based on 100 parts by volume of the total volume of the nonaqueous organic solvent, the first compound, and the second compound.