| abstract |
The present invention relates to a negative electrode active material and a method for preparing the same, and particularly relates to a negative electrode active material comprising: a core comprising artificial graphite and hard carbon; and a shell surrounding the core and comprising natural graphite, wherein the shell is such that the natural graphite The stacks and structures therein are formed in such a way as to cover the surface of the core. The anode active material according to the present invention allows natural graphite to completely surround artificial graphite and hard carbon, thereby showing high initial efficiency and lifespan since hard carbon showing low initial efficiency and having high electrolyte consumption is not exposed to the outside. In addition, since natural graphite, artificial graphite, and hard carbon are all used, high output properties can be exhibited due to low lithium ion diffusion resistance as compared to using only natural graphite. |