| 摘要 |
The present invention relates to an anode active material and a preparation method therefor and, particularly, to an anode active material comprising: a core including artificial graphite and hard carbon; and a shell encompassing the core and including natural graphite, wherein the shell is formed such that the natural graphite is stacked and structured therein so as to cover the surface of the core. The anode active material according to the present invention enables natural graphite to fully encompass artificial graphite and hard carbon, thereby exhibiting a high initial efficiency and lifespan since hard carbon, which exhibits a low initial efficiency and has high electrolyte consumption, is not exposed to the outside. In addition, since all of the natural graphite, artificial graphite, and hard carbon are used, a high output property can be exhibited due to a low diffusion resistance of lithium ions compared to when only the natural graphite is used. |
