Organic electrolytic solution and lithium battery using the same

An organic electrolyte solution, comprising:

• a lithium salt;
• an organic solvent;
• and
• a sulfonate ester-based compound represented by Formula 1,
• R2—O—S(═O)2—R1 <Formula 1>
• wherein, in Formula 1,
• R1 is a C1-C20 alkyl group that is unsubstituted or substituted with halogen, a C5-C20 cycloalkyl group that is unsubstituted or substituted with halogen, a C6-C40 aryl group that is unsubstituted or substituted with halogen, or a C2-C40 heteroaryl group that is unsubstituted or substituted with halogen, and
• R2 is represented by Formula 2:
• wherein, in Formula 2,
• R3 and R4 are each independently hydrogen, a C1-C20 alkyl group that is unsubstituted or substituted with halogen, a C2-C20 alkenyl group that is unsubstituted or substituted with halogen, a C2-C20 alkynyl group that is unsubstituted or substituted with halogen, a C5-C20 cycloalkyl group that is unsubstituted or substituted with halogen, a C6-C40 aryl group that is unsubstituted or substituted with halogen, a C2-C40 heteroaryl group that is unsubstituted or substituted with halogen, or a polar functional group having at least one heteroatom,
• n is an integer selected from 4 to 9, and
• * represents the R2-oxygen bond in Formula 2,
• provided that at least one of R3 and R4 is a C1-C20 alkyl group that is unsubstituted or substituted with halogen, a C2-C20 alkenyl group that is unsubstituted or substituted with halogen, a C2-C20 alkynyl group that is unsubstituted or substituted with halogen, a C5-C20 cycloalkyl group that is unsubstituted or substituted with halogen, a C6-C40 aryl group that is unsubstituted or substituted with halogen, a C2-C40 heteroaryl group that is unsubstituted or substituted with halogen, or a polar functional group having at least one heteroatom.