METHOD FOR PREPARING A NEGATIVE ELECTRODE ACTIVE MATERIAL

摘要

The present invention relates to a method for preparing a negative electrode active material, the method being characterized by comprising the steps of: (a) preparing a coating mixture by mixing a hydrophilic substance with a precursor for a raw material of at least one substance selected from the group consisting of low crystalline carbon and amorphous carbon and then by purifying the resultant mixture, wherein the hydrophilic substance contains an oxide capable of absorbing and desorbing ions; (b) mixing the coating mixture with a crystalline carbonaceous substance to prepare a core-shell precursor in which a core including the crystalline carbonaceous substance is coated with the coating mixture; (c) carbonizing a raw material of at least one substance selected from the group consisting of low crystalline carbon and amorphous carbon, into at least one substance selected from the group consisting of low crystalline carbon and amorphous carbon by calcination of the core-shell precursor.