In Situ Grown Functional Interfaces for Enhanced Lithium‐Ion Transport in Silicon–Carbon Anodes

Abstract

Chemical vapor deposition‐derived silicon–carbon (CVD‐Si/C) materials are promising Si‐based anodes for next‐generation lithium‐ion batteries (LIBs), offering high capacity, improved initial coulombic efficiency (ICE), and mitigated volume expansion. However, the fast‐charging capability of CVD‐Si/C anodes is severely limited by the discontinuous distribution of nanosized Si within the highly porous carbon framework, which disrupts Li + transport pathways. Recently, Lu et al. developed a novel CVD‐Si/C anode material (SSC@LSO) featuring a continuous Li + transport interface (Li x SiO y layer), which effectively mitigates volume expansion and suppresses parasitic electrolyte reactions. Consequently, the SSC@LSO anode delivers markedly enhanced rate capability and cycling durability. Notably, Ah‐level pouch cells demonstrate outstanding practical application‐level performance, retaining 91.7% capacity after 1000 cycles at 25°C and sustaining 86.9% capacity utilization at 5C, underscoring its promise for high energy LIBs.