NOVELTY - The composition comprises conjugated dienes latex particle, acrylic acid ester system latex particle, where content of the latex particle is in 50-90 wt.% based on total mass of solid content. The conjugated dienes latex particles are made of 39-80 wt.% aromatic vinyl compound that comprises 29-70 wt.% vinyl cyanide, polymeric composition of 30-70 wt.% conjugate diene series, 10-60 wt.% acrylamide group compound, acrylic acid ester system compound i.e. acrylic acid ester compound, or 1-15 wt.% unsaturated mono carboxylic acid system compound.    USE - Binder composition for a lithium secondary battery of a battery pack (all claimed).    ADVANTAGE - The composition improves excellent connectivity between an electrode material and a current collector so as to maintain charging/discharging state of a battery in a stable manner, so that initial quantity and service life of the battery can be improved.    DETAILED DESCRIPTION - The conjugate diene series is selected from 1,3- butadiene, isoprene, chloroprene or piperidine. The acrylic acid ester compound comprises C1-C14 alkyl group e.g. methyl acrylate, ethyl acrylate, propyl acrylate, isopropyl acrylate, n-butyl acrylate, isobutyl acrylate, n- amylacrylate, isoamyl acrylate, n-ethylhexyl acrylate, 2-ethylhexyl acrylate, 2-hydroxy ethyl acrylate, methylmethacrylate, ethylmethacrylate, profile mecrylate, isopropyl mecrylate, n-butylmethacrylate, isobutyl methacrylate, n-amylmethacrylate, isoamyl methacrylate, n-hexylmethacrylate, n-ethylhexylmethacrylate, 2 ethylhexyl methacrylate, hydroxyethyl methacrylate or hydroxypropyl methacrylate. The aromatic vinyl compound comprises styrene, alpha-methylstyrene, beta-methylstyrene, p-methylstryene, p-t-butylstyrene or vinyl toluene. The vinyl cyanide comprises monomer that is made of acrylonitrile, methacrylonitrile or cyanogen functional group. The acrylamide group compound comprises acrylamide, n-methylolacrylamide, n-butoxymethyl acrylamide, methacrylate, n-methylolmethacrylamide or n-butoxy methylmethacrylamide. The unsaturated mono carboxylic acid system compound comprises crotonic acid, isocrotonic acid, maleic anhydride, fumaric acid, itaconic acid, acrylic acid or methacrylic acid.