Patent ID: 8524401

Claim:
A lithium battery comprising: a negative electrode comprising a negative active material; a positive electrode comprising a positive active material; and an electrolyte, wherein the electrolyte comprises a nonaqueous organic solvent, lithium salt, a first compound represented by Formula 1 below, and a second compound represented by Formula 2 below: wherein, Q 1 is a C 2 -C 30 alkyl group substituted with one or more —F; 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 —F, a C 2 -C 30 alkenyl group substituted with one or more —F, or a C 2 -C 30 alkynyl group substituted with one or more —F; R 1 through R 6 in the second compound are each independently selected from the group consisting of —F and —OT 1 , wherein T 1 is a C 1 -C 30 alkyl group; a C 2 -C 30 alkenyl group; a C 2 -C 30 alkynyl group; a C 6 -C 12 cycloalkyl group; a C 5 -C 30 aryl group; a C 1 -C 30 alkyl group substituted with at least one substituent selected from the group consisting of —F, a hydroxyl group, and a carboxyl group; a C 2 -C 30 alkenyl group substituted with at least one substituent selected from the group consisting of —F, a hydroxyl group, and a carboxyl group; a C 2 -C 30 alkynyl group substituted with at least one substituent selected from the group consisting of —F, a hydroxyl group, and a carboxyl group; a C 6 -C 12 cycloalkyl group substituted with at least one substituent selected from the group consisting of —F, a hydroxyl group, and a carboxyl group; or a C 5 -C 30 aryl group substituted with at least one substituent selected from the group consisting of —F, a hydroxyl group, and a carboxyl group, wherein a case where all R 1 through R 6 are —F or —OT 1 is excluded and the number ratio of fluorine atoms to hydrogen atoms in the first compound is 1 or above, wherein an amount of the first compound is in a range of about 10 parts by volume to about 30 parts by volume based on 100 parts by volume of a total volume of the nonaqueous organic solvent, the first compound, and the second compound, and wherein an amount of the second compound is in a range of 5 parts by volume to about 10 parts by volume based on 100 parts by volume of a total volume of the nonaqueous organic solvent, the first compound, and the second compound.