1. A lithium secondary battery comprising:a cathode;
a separator, wherein the separator is a porous polymer film or a porous nonwoven fabric; and
a gel polymer electrolyte,
wherein the gel polymer electrolyte comprises an acrylate-based polymer,
wherein the cathode comprises a cathode active material consisting of any one selected from the group consisting of compounds of Chemical Formulas 1, 3, LiFePO4 and a mixture of two or more thereof:
(where M is one or more elements selected from the group consisting of Al, magnesium (Mg), Ni, Co, manganese (Mn), Ti, gallium (Ga), copper (Cu), vanadium (V), niobium (Nb), Zr, cerium (Ce), indium (In), zinc (Zn), and yttrium (Y), X is one or more elements selected from the group consisting of oxygen (O), fluorine (F), and nitrogen (N), A is P, S, or a mixed element thereof, 0?a?0.2, and 0.5?x?1),
wherein the gel polymer electrolyte is formed by in-situ polymerization in the lithium secondary battery of a composition consisting of an electrolyte solution solvent, an ionizable lithium salt, a polymerization initiator, and a monomer selected from the group consisting of ditrimethylolpropane tetraacrylate, dipentaerythritol pentaacrylate, dipentaerythritol hexaacrylate, and a mixture of two or more thereof, wherein the electrolyte solution solvent is linear carbonate, cyclic carbonate, or a combination thereof, and
wherein the anode comprises an anode active material comprising a carbon material.