| abstract |
The present invention relates to a silicon-based composite represented by SiO a (a is 0? Y <1); And a carbon coating layer distributed on the surface of the silicon-based composite, and having a bimodal pore structure including nano pores and mesopores, and a lithium secondary battery comprising the same, The initial efficiency and the capacity characteristics can be improved by controlling the oxygen content, and the specific surface area can be controlled together, and the side reaction with the electrolyte can be reduced. |