▎ 摘　　要

NOVELTY - A porous silicon-carbon composite comprises core including active particles comprising pores (a) and pores (b) and conductive material formed on at least a portion of the surfaces of the active particles and shell layer coated on the core and including graphene. The active particles include silicon particles and/or silicon oxide particles. The pore (a) is inside the core and is formed by the cohesion of active particles. The pore (b) is irregularly dispersed inside the core, has an average diameter smaller than the average diameter of the active particles, and has globular shape. USE - Porous silicon-carbon composite is used for negative electrode active material for lithium secondary battery (all claimed) for video camera, mobile phone and laptop. ADVANTAGE - The porous silicon-carbon composite has excellent electroconductivity and mechanical strength, and is efficiently manufactured by a simple process. The lithium secondary battery containing the negative electrode active material obtained using porous silicon-carbon composite has high cycle characteristics and capacity retention rate. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) preparation of porous silicon-carbon composite; and (2) negative electrode active material.