NOVELTY - Preparation of lithium-ion battery involves drying positive plate formed by coating anode slurry prepared using lithium-iron phosphate, conductive agent, carboxymethyl cellulose and styrene-butadiene rubber on aluminum foil, and cathode sheet formed by coating cathode slurry prepared using hard carbon, conductive agent, carboxymethyl cellulose and styrene-butadiene rubber on copper foil, rolling respectively, cutting using machine, vacuum-drying in vacuum drying box at 100 degrees C, and assembling obtained positive and negative electrodes in glove box filled with argon gas.    USE - Preparation of lithium-ion battery e.g. 2025-type button battery, square battery, soft-package battery and cylindrical battery (all claimed).    ADVANTAGE - The lithium-ion battery having improved cycling characteristics is economically, environmentally-friendly and safely prepared.    DETAILED DESCRIPTION - Preparation of lithium-ion battery involves preparing anode slurry by taking (in wt.%) anode active lithium-iron phosphate (78-82), conductive agent (10-15), thickening agent (1-3) and adhesive (1-3), obtaining mixture (M1) by dispersing dried lithium-iron phosphate and conductive agent in acetone solution and stirring for 1 hours, dissolving carboxymethyl cellulose as thickening agent in deionized water, adding mixture, stirring obtained carboxymethyl cellulose solution (CC1) for 1-2 hours, adding carboxymethyl cellulose solution (CC1) with styrene-butadiene rubber as adhesive, stirring for 2-4 hours to obtain anode slurry, preparing cathode slurry by taking hard carbon (90-95), conductive agent (0.5-1.5), thickening agent (1-3) and adhesive (1-3), adding hard carbon and conductive agent, stirring, dispersing in acetone solution for 1 hours to obtain mixture (M2), adding carboxymethyl cellulose as thickening agent dissolved in deionized water, stirring for 1-2 hours to obtain carboxymethyl cellulose solution (CC2), adding solution (CC2) with styrene-butadiene rubber as adhesive and stirring for 2-4 hours to obtain cathode slurry, forming positive plate by coating anode slurry on aluminum foil using 200 mu m-sized applicator, forming cathode sheet by coating cathode slurry on copper foil using 150 mu m-sized applicator, drying positive plate and cathode sheet in oven, rolling dried positive plate and cathode sheet using roller, cutting obtained positive electrode sheet and negative electrode sheet to diameter of 16 mm using machine, vacuum-drying in vacuum drying box at 100 degrees C, and assembling obtained positive and negative electrodes in glove box filled with argon gas to obtain predetermined lithium-ion battery.