Composition for polymer electrolyte and lithium secondary battery including polymer electrolyte prepared therefrom

A composition for a polymer electrolyte, comprising:

• a lithium salt, an organic solvent, a polymerization initiator, and a polymerizable oligomer,
• wherein the polymerizable oligomer comprises at least one of an oligomer represented by Formula 1 or an oligomer represented by Formula 2:
• wherein, in Formula 1,
• R′ and R″ are each independently an aliphatic hydrocarbon group or an aromatic hydrocarbon group,
• R1 and R2 are each independently a substituted or unsubstituted alkylene group having 1 to 10 carbon atoms, a substituted or unsubstituted cycloalkylene group having 4 to 20 carbon atoms, a substituted or unsubstituted arylene group having 6 to 20 carbon atoms, a substituted or unsubstituted heterocycloalkylene group having 2 to 20 carbon atoms, —CO—O—R—, where R is an alkylene group having 1 to 10 carbon atoms, —R0—CO—, {where R0 is an alkylene group having 1 to 10 carbon atoms}, or —R3—O—R4—, where R3 and R4 are each independently a substituted or unsubstituted alkylene group having 1 to 10 carbon atoms,
• Ra, Rb, Rc, and Rd are each independently hydrogen or an alkyl group having 1 to 3 carbon atoms,
• n is an integer of 1 to 100, and
• m is an integer of 1 to 100,
• a and c are each independently an integer of 0 to 2, and
• b and d are each independently an integer of 1 to 3,
• wherein, in Formula 2,
• R5, R6, R7, and R8 are each independently a substituted or unsubstituted alkylene group having 1 to 10 carbon atoms, a substituted or unsubstituted cycloalkylene group having 4 to 20 carbon atoms, a substituted or unsubstituted arylene group having 6 to 20 carbon atoms, a substituted or unsubstituted heterocycloalkylene group having 2 to 20 carbon atoms, —CO—O—Rj, where R is an alkylene group having 1 to 10 carbon atoms, —Rk—CO—, where Rk is an alkylene group having 1 to 10 carbon atoms, or —R12—O—R13—, where R12 and R13 are each independently a substituted or unsubstituted alkylene group having 1 to 10 carbon atoms,
• R9, R10, and R11 are each independently an aliphatic hydrocarbon group or an aromatic hydrocarbon group,
• Re, Rf, Rg, and Rh are each independently hydrogen or an alkyl group having 1 to 3 carbon atoms,
• o is an integer of 1 to 100,
• p is an integer of 1 to 100, and
• q is an integer of 1 to 100,
• a1 and c1 are each independently an integer of 0 to 2, and
• b1 and d1 are each independently an integer of 1 to 3.