GRAPHENE-WRAPPED POROUS SILICON-CARBON COMPOSITE AND PREPARATION METHOD THEREOF

摘要

The present invention relates to a porous silicon-carbon composite, a method for producing the same, and a negative electrode and a lithium secondary battery including the same. The porous silicon-carbon composite includes: a core including a plurality of active particles, a conductive material formed on portions of the surfaces of the active particles, first pores, and second pores; and a first shell layer which is applied to coat the core and includes graphene. The active particles include a plurality of silicon particles, silicon oxide particles, or combination thereof. The first pores exist in the core and are formed by coagulation between the active particles. The second pores exist to be irregularly dispersed in the core and are in globular shapes. An average diameter of the second pores is smaller than an average diameter of the active particles.