Honeycomb-Like Porous Carbon Framework with Consecutive Conductive Channels for Stable SiOx/C Anodes

Silicon oxide (SiOx) materials have been extensively researched. However, slow intrinsic kinetics and significant volume changes hinder the practical deployment of SiOx anodes. Herein, an in situ molecular polymerization strategy, in which a loading substrate (PM) is introduced into a mixed solution of silane, is devised to construct SiOx/C composites with honeycomb porous frameworks through one-step condensation followed by carbonization at 900 °C without any template or additive. The uniform dispersion of SiOx/C facilitates rapid Li+ transport and stress dissipation, while abundant pore volume accommodates SiOx/C expansion during lithiation/delithiation, thereby alleviating mechanical stress and enhancing electrode-electrolyte wettability. The continuous honeycomb-like channel changes capacitive behavior of the anode, improving lithium-ion diffusion kinetics and electrochemical performances at high current densities. The PM@SiOx/C anode delivers 95.8% capacity retention after 500 cycles at 2 A g-1, which is attributed to the dual protection from both well-dispersed carbon and honeycomb porous frameworks. This molecular polymerization strategy facilitates the scalable production of Si-based porous materials, simultaneously establishing a distinctive way to prepare template-free porous frameworks.