Organic electrolytic solution and lithium battery including the same

An organic electrolytic solution, comprising:

• a first lithium salt;
• an organic solvent;
• a bicyclic sulfate-based compound represented by Formula 1 below;
• and
• a monocyclic phosphate-based compound represented by Formula K1 below:
• wherein:
• in Formula 1, each of A1, A2, A3, and A4 is independently a covalent bond, a substituted or unsubstituted C1-C5 alkylene group, a carbonyl group, or a sulfinyl group, wherein both A1 and A2 are not a covalent bond and both A3 and A4 are not a covalent bond,
• in Formula K1, each of A5 and A6 is independently a substituted or unsubstituted C1-C5 alkylene group,
• an amount of the bicyclic sulfate-based compound is from about 0.1 wt % to about 5 wt %, based on a total weight of the organic electrolytic solution, and
• an amount of the monocyclic phosphate-based compound is from about 0.05 wt % to about 5 wt %, based on the total weight of the organic electrolytic solution.