Electrolyte composition for lithium secondary battery and lithium secondary battery including the same

A thermosetting electrolyte composition for a lithium secondary battery, the thermosetting electrolyte composition comprising:

• LiPF6 as a first lithium salt,
• a non-aqueous organic solvent, and
• a polymer or oligomer containing:
• a unit represented by Formula 1,
• wherein the polymer or oligomer is included in an amount of 0.6 wt % to 15 wt % based on a total weight of the thermosetting electrolyte composition for a lithium secondary battery:
• wherein, in Formula 1,
• R is substituted or unsubstituted alkylene group having 1 to 5 carbon atoms,
• R1 is —OH or
• wherein R′ is a substituted or unsubstituted alkylene group having 2 to 3 carbon atoms, R″ is hydrogen, —OH, or a substituted or unsubstituted alkyl group having 1 to 3 carbon atoms, and b is an integer of 0 or 1,
• R2 is a substituted or unsubstituted alkylene group having 1 to 5 carbon atoms or a substituted or unsubstituted alkenylene group having 2 to 5 carbon atoms,
• R1 is a substituted or unsubstituted cycloalkyl group having 3 to 10 carbon atoms which contains a ketone group or a substituted or unsubstituted heterocycloalkyl group having 2 to 10 carbon atoms which contains a ketone group,
• a is an integer of 0 or 1, and
• k, m, and n are numbers of repeating units,
• wherein k is an integer of 1 to 7,000,
• m is an integer of 0 to 2,000,
• n is an integer of 1 to 600, and
• n is not 0