Polymer electrolyte, lithium secondary battery using same, and method for manufacturing lithium secondary battery

A lithium secondary battery comprising:

• a positive electrode and a negative electrode that allow occlusion and release of lithium;
• and a polymer electrolyte disposed between the positive electrode and the negative electrode,
• wherein the polymer electrolyte comprises:
• a porous separator having a plurality of nanofibers;
• and
• a gel polymer portion impregnated in the porous separator,
• wherein the gel polymer portion is formed by a polymerization reaction of a gel polymer forming monomer, from an electrolytic solution that is impregnated into in the porous separator and comprising an organic solvent, a lithium salt solute, the gel polymer forming monomer, and a polymerization initiator.

A lithium secondary battery comprising:

• an electrode assembly in which a plurality of unit positive electrode cells and a plurality of unit negative electrode cells are separated and are alternately stacked by using a pair of porous separators;
• a compression band for taping an outer circumference of the electrode assembly;
• a case in which the electrode assembly taped with the compression band is contained;
• and
• a polymer electrolyte disposed between each unit positive electrode cell and each unit negative electrode cell,
• wherein the polymer electrolyte comprises:
• the porous separators;
• and a gel polymer portion impregnated in the porous separator,
• wherein the gel polymer portion is formed by a polymerization reaction of a gel polymer forming monomer, from an electrolytic solution that is impregnated into in the porous separators and comprising an organic solvent, a lithium salt solute, the gel polymer forming monomer, and a polymerization initiator.