NOVELTY - The binder comprises a core-shell structure adhered with a core that is made of styrene-butadiene rubber material. The core is fixed with a shell that is made of copolymer material. The copolymer material is ethylenic unsaturation carboxyclic acid monomer, coupled diene group monomer, acrylic acid ester class monomer, acrylate-based monomer, vinyl monomer or nitrile monomer material. Weight ratio of the shell and the core is 95:5-5:95. The coupled diene group monomer is 1,3-butadiene, isoprene, 2,3-dimethyl-1,3- butadiene or 1,3- pentadiene monomer material.    USE - Binder for an electrode of a secondary battery of an electrochemical energy utilization device, a portable apparatus such as handheld computer, mobile phone and camera, and a vehicle i.e. car e.g. electric vehicle, hybrid electric vehicle, diesel vehicle and petrol vehicle (all claimed).    ADVANTAGE - The core-shell structure is adhered with the core that is made of styrene-butadiene rubber material, and the core is fixed with the shell that is made of copolymer material so as to improve structural stability, recyclability, durability and eco-friendly effect of a secondary battery.    DETAILED DESCRIPTION - The acrylic acid ester class monomer is methyl acrylate, ethyl acrylate, acrylic acid propyl, isopropyl acrylate, acrylic acid n-butyl, acylate isobuthyl, acrylic acid n-amyl, acylate isoamyl, acrylic acid n-hexyl, acrylic acid 2-ethylhexyl, acrylic acid hydroxypropyl, lauryl acylate, methyl methacrylate, ethyl methacrylate, methacrylate propyl, methacrylic acid isopropyl, N-butyl methacrylate, isobutyl methacrylic acid, methacrylic acid n-amyl, isoamyl methacrylic acid, methacrylic acid n-hexyl, methacrylic acid n-ethylhexyl, methacrylic acid 2-ethylhexyl, methacrylate hydroxyethyl or hidroxypropylmethacrylate material. The acrylate-based monomer is methacryloxy ethylethylene urea, beta-carboxyethyl acrylate, aliphatic monoacrylate, dipropylene diacrylate, di-trimethylopropane tetraacrylate, hydroxy ethyl acrylate, di-pentaerythriol hexaacrylate, pentaerythriol triacylate, pentaerythriol tetraacrylate, lauryl acrylate, seryl acrylate, stearyl acrylate, lauryl methacrylate, seryl methacrylate, butyl acrylate, glycidyl methacrylate or stearyl methacrylate material. The vinyl monomer is styrene, P-methylstryene, alpha-methylstyrene, beta-methylstyrene, 2,4-dimethyl styrene, p-ethylstyrene, p-t-butylstyrene, divinylbenzene or vinyl naphthalene material. The nitrile monomer is succinonitrile, sebaconitrile, fluorination nitrile, nitryl chloride, acrylonitrile or methacrylonitrile material. The ethylenic unsaturation carboxyclic acid monomer is acrylic acid, methacrylic acid, crotonic acid, isocrotonic acid, maleic acid, fumaric acid, citraconic acid, mesaconic acid, glutaconic acid or itaconic acid.