NOVELTY - The electrolyte comprises gel polymer composition that comprises corrosion inhibitor, polymeric monomer i.e. acrylate compound, polymerization initiator, electrolyte salt i.e. imide salt, and transmitted solvent. The polymeric monomer comprises corrosion suppressing functional group material that is phosphate group or sulfate group material. The corrosion inhibitor is trimethyl silyl phosphate, triethylsilyl phosphate, sodium hydride, sodium phosphate, sodium, sodium sulfate, methylene methane di sulfonate, propane sultone, propenesultone, ethylene sulfate or ethylene sulfite.    USE - Gel polymer electrolyte for a secondary battery e.g. secondary lithium battery, cylinder-type battery, angular-type battery and pouch-type battery (all claimed), of an electronic equipment e.g. mobile phone, notebook computer and camcorder.    ADVANTAGE - The electrolyte comprises the gel polymer composition that comprises the corrosion inhibitor, the polymeric monomer, the polymerization initiator, the electrolyte salt and the transmitted solvent so as to effectively prevent corrosion of an anode of a secondary battery, so that operating performance of the secondary battery can be easily improved.    DETAILED DESCRIPTION - The polymeric monomer is 2-cyanoethylacrylate, tetraethylene glycol diacrylate, polyethylene glycolarylate 1,4-butandiol diacrylate, 1,6-hexanediol diacrylate, trimethylolpropane triacylate, trimethylolpropane captive Foxy rate triacylate, ditrimethylolpropane tetraacrylate, pentaerythritol tetraacrylate, pentaerythritol ethoxylate tetraacrylate, dipentaerythritol pentaacrylate, dipentaerythritol hexaacrylate, polyethylene glycol diglycidyl ether, 1,5-hexadiene diepoxide, glycerol propoxy rate triglycidyl ether, vinyl cyclohexene dioxide, 1,2,7,8-diepoxyoctane, 4-vinyl cyclohexene dioxide, butyl glycidyl ether, diglycidyl 1,2-cyclohexane dicarboxylate, ethylene glycol diglycidyl ether, glycerol triglycidyl ether and glycidyl methacrylate. The corrosion suppressing functional group material is ethyl glycol methacrylate phosphate, mevinphos, 2-methacryloyloxyethyl choline phosphate, bis 2 -(methacryloyloxy) ethyl phosphate, methyl (2E) -3 ((dimethoxyphosphoryl) oxy) boot -2-enoate, mono acryloxyethyl phosphate, 10 -(phosphonooxy) decyl methacrylate, 2-diethoxy phosphynyl oxy ethylmethacrylate, (phosphonooxy) propane -1,3-diyl bismethacrylate, 2-sulfoethyl methacrylate, (2 -(methacryloyloxy) ethyl) dimethyl -(3-sulphopropyl) ammonium hydroxide, 2-propenoic acid, 4- ((methyl sulfonyl) oxy) butyl ester, methacrylic acid 2 -(methansulfonyloxy) ethyl-ester and acrylic acid 2 -(methansulfonyloxy) ethyl-ester. The electrolyte is coated on a protection film that is adhered to an insulating layer. The protection film comprises PET group film, polyimide group film or polypropylene group film. The insulating layer is made of PET, polypropylene, polyester, polyphenylenesulfide, polyimide, acetate, glass cloth, polyvinylidene fluoride, fluorinated vinylidene hexa fluoro propylene copolymer, epoxy-based resin or polyamide-based resin. An INDEPENDENT CLAIM is also included for a secondary battery.