NEGATIVE ACTIVE MATERIAL, MANUFACTURING METHOD THEREOF AND LITHIUM SECONDARY BATTERY COMPRISING THE SAME

摘要

PURPOSE: A manufacturing method of a negative electrode active material is provided to improve electrochemical performance of a negative electrode by using a styrene butadiene rubber and carboxyl methyl cellulose composite binder. CONSTITUTION: A manufacturing method of a negative electrode active material comprises a step of mixing a metal salt aqueous solution and reducing agent; a step of forming a reducing agent/metal ion sol by mixing the mixture; a step of forming a reducing agent/metal ion gel by heating the sol; a step of sintering the reducing agent/metal ion composite to form Sn-Co-Fe-C composite negative electrode active material; a step of mixing an aqueous binder and conducting agent into the negative electrode active material and manufacturing a negative electrode mixture slurry; and a step of spreading the negative electrode mixture slurry on a CU foil and drying the spread material. [Reference numerals] (AA) Dissolve minimum amount in distilled water at 80°C; (BB) Sn-Co-Fe-C ion mixed solution; (CC) Citric acid(1 molar ratio); (DD) Acrylamide(1-z molar ratio); (EE) N,N'-methylene-bis-acrylamide(z molar ratio); (FF) Stir at 80°C; (GG) (Sn-Co-Fe-C) aqueous solution; (HH) Sn-Co-Fe-C CAM(1 molar ratio); (II) Dry(100°C, 12h); (JJ) Sn-Co-Fe-C composite; (KK) Thermally treat(300°C, 5h, Ar); (LL) Plasticized composite; (MM) Pulverize; (NN) Pulverized plasticized composite; (OO) Thermally treat at 550°C, 3h, Ar, 5°C/min / Pulverize and distribute; (PP) Sn-Co-Fe-C compound anodizing material