Precursor composition for preparing polymer electrolyte, and polymer electrolyte and secondary battery prepared by using the same

A precursor composition for preparing a polymer electrolyte, comprising:

• a lithium salt,
• a non-aqueous organic solvent,
• a polymerization initiator,
• an oligomer represented by Formula 1, and
• a compound represented by Formula 2,
• wherein the oligomer represented by the Formula 1 and the compound represented by the Formula 2 are included in a weight ratio of 1:0.01 to 1:4,
• wherein the Formula 1 is:
• wherein, in the Formula 1,
• R, R1, and R2 are each independently an alkylene group having 1 to 5 carbon atoms,
• A and A′ are each independently a unit containing one or more (meth)acrylate groups,
• B is a unit containing at least one amide group, and
• n, m, and k are numbers of repeating units,
• wherein n is an integer of 1 to 10,000,
• m is an integer of 1 to 1,000, and
• k is an integer of 1 to 100,
• wherein the Formula 2 is:
• wherein, in the Formula 2,
• R3 is —CR5═CH2 or -R6-CF3,
• R5 is hydrogen or an alkyl group having 1 to 3 carbon atoms,
• R6 is an alkylene group having 1 to 20 carbon atoms which is substituted with at least one fluorine element,
• R4 is an alkylene group having 1 to 20 carbon atoms which is unsubstituted or substituted with at least one fluorine or an alkyl group having 1 to 20 carbon atoms which is unsubstituted with fluorine,
• p is an integer of 0 or 1, and
• when R3 is -R6-CF3, p is 0, and R4 is the alkyl group having 1 to 20 carbon atoms which is unsubstituted with fluorine.