▎ 摘　　要

NOVELTY - A silicon-carbon composite material comprises a core containing silicon-based material and a coating layer (A) and a coating layer (B) on the surface of the inner core. The coating layer (A) is a conductive layer, and the coating layer (B) is a conductive ion layer. The coating layers (A, B) are provided in any order. USE - Silicon-carbon composite material for secondary lithium battery. ADVANTAGE - The silicon-carbon composite material has strong expansion proof property due to the presence of the composite coating layer having electrical conductivity (or ion-conducting) capability and reinforcing and toughening properties. The composite material reduces electrolyte consumption and improves battery cycle performance. The composite material is prepared by a simple and easy to implement process suitable for large-scale industrial production. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of the composite mateiral.