Composition for gel polymer electrolyte and lithium secondary battery including the same

An electrolyte composition for a gel polymer electrolyte, comprising:

• a solvent;
• a lithium salt;
• and
• a first monomer represented by the following Formula 1:
• R—CH(3-n)N═C═O)n [Formula 1]
• in Formula 1,
• R is a C1-5 alkyl group including an acrylate group or a methacrylate group or a C1-20 aryl group including an acrylate group or a methacrylate group, and
• n is an integer of 2 to 3, and
• a second monomer, wherein the second monomer includes one or more functional groups selected from the group consisting of an acrylate group, a vinyl group, an epoxy group, an amino group, an amide group, an imide group, a hydroxyl group, a methylol group and a carboxyl group,
• wherein a content of the first monomer is in a range of 0.2 to 5 wt % based on the electrolyte composition, and
• wherein a content of the first monomer and the second monomer is in a range of 0.5 to 20 wt % based on the electrolyte composition.