| 摘要 |
The present invention relates to a negative electrode active material and a method for preparing the same and, more specifically, to a negative electrode active material obtained by modifying a surface of artificial graphite with nitrogen atoms, the nitrogen atoms having a content of 5-10 wt% on the basis of all atoms existing in the outermost shell of the negative electrode active material. The negative electrode active material according to the present invention, which is obtained by modifying a surface of artificial graphite with nitrogen, has improved dispersibility in an aqueous system, so the affinity between a binder and the negative electrode active material is improved, thereby increasing the binding strength of an electrode. In addition, only a particular quantity of the surface of the artificial graphite is modified with nitrogen, and thus the battery capacity is maintained high. Furthermore, in the method for preparing a negative electrode active material according to the present invention, only 10-20 wt% of an oxygen-containing functional group is linked to the artificial graphite through a mild oxidation process, so the nitrogen is easily attached to the artificial graphite to allow the artificial graphite to exhibit hydrophilicity, and the artificial graphite becomes an electrical conductor due to the maintenance of original crystallinity thereof, leading to excellent battery efficiency. |
