Constructing Biomass‐Based Ultrahigh‐Rate Performance SnOy@C/SiOx Anode for LIBs via Disproportionation Effect

Abstract To break the stereotype that silica can only be reduced via a magnesiothermic and aluminothermic method at low‐temperature condition, the novel strategy for converting silica to SiO x using disproportionation effect of SnO generated via low‐temperature pyrolysis coreduction reaction between SnO 2 and rice husk is proposed, without any raw materials waste and environmental hazards. After the low‐temperature pyrolysis reaction, SnO y @C/SiO x composites with unique structure (Sn/SnO 2 dispersed on the surface and within pores of biochar as well as SiO x residing in the interior) are obtained due to the exclusive biological properties of rice husk. Such unique structural features render SnO y @C/SiO x composites with an excellent talent for repairing the damaged structure and the highly electrochemical storage ability (530.8 mAh g −1 at 10 A g −1 after 7500 cycles). Furthermore, assembled LiFePO 4 ||SnO y ‐50@C/SiO x full cell displays a high discharge capacity of 463.7 mAh g −1 after 100 cycles at 0.2 A g −1 . The Li + transport mechanism is revealed by density functional theory calculations. This work provides references and ideas for green, efficient, and high‐value to reduce SiO 2 , especially in biomass, which also avoids the waste of raw materials in the production process, and becomes an essential step in sustainable development.