Preparation and Lithium Storage Performance of Si/C Composites as Anode Materials for Lithium-Ion Batteries: A Review

Silicon offers a theoretical specific capacity of up to 4200 mAh g⁻¹, positioning it as one of the most promising materials for next-generation lithium-ion batteries (LIBs). However, during lithium insertion and deinsertion, Si undergoes significant volume expansion, leading to rapid capacity degradation, which has limited its application as an anode material in LIBs. To address this issue, coupling Si with carbon enables the combination of the high lithiation capacity of Si with the excellent mechanical strength and electrical conductivity of carbon. This synergy makes silicon/carbon composites (Si/C) ideal candidates for LIB anodes. In this review, recent advancements in Si/C composite materials for LIBs are categorized based on synthesis methods and design principles. The review also summarizes the morphological characteristics and electrochemical performance of these materials. Additionally, other factors influencing the performance of Si/C anodes are discussed, and future development prospects for Si/C anodes are briefly explored.