biostudies-literatureGuo XPriority Academic Program Development of Jiangsu Higher Education InstitutionsChangjiang scholars program of the Ministry of EducationChina Postdoctoral Science FoundationNational Natural Science Foundation of ChinaNatural Science Foundation of Jiangsu Provincee2206084https://www.ebi.ac.uk/biostudies/studies/S-EPMC9896072biostudies-literatureUnknown10(4)Silicon suboxide (SiO_x ) has attracted widespread interest as Li-ion battery (LIB) anodes. However, its undesirable electronic conductivity and apparent volume effect during cycling impede its practical applications. Herein, sustainable rice husks (RHs)-derived SiO₂ are chosen as a feedstock to design SiO_x /iron-nitrogen co-doped carbon (Fe-N-C) materials. Using a facile electrospray-carbonization strategy, SiO_x nanoparticles (NPs) are encapsulated in the nitrogen-doped carbon (N-C) frameworks decorating atomically dispersed iron sites. Systematic characterizations including high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) and X-ray absorption fine structure (XAFS) verify the existence of Fe single atoms and typical coordination environment. Benefiting from its structural and compositional merits, the SiO_x /Fe-N-C anode delivers significantly improved discharge capacity of 799.1 mAh g^-1 , rate capability, and exceptional durability, compared with pure SiO₂ and SiO_x /N-C, which has been revealed by the density functional theory (DFT) calculations. Additionally, the electrochemical tests and in situ X-ray diffraction (XRD) analysis reveal the oxidation of Li_x Si phase and the storage mechanism. The synthetic strategy is universal for the design and synthesis of metal single atoms/clusters dispersed N-C frameworks encapsulated SiO_x NPs. Meanwhile, this work provides impressive insights into developing various LIB anode materials suffering from inferior conductivity and huge volume fluctuations.Advanced science (Weinheim, Baden-Wurttemberg, Germany)Embedding Atomically Dispersed Iron Sites in Nitrogen-Doped Carbon Frameworks-Wrapped Silicon Suboxide for Superior Lithium Storage.PMC9896072U19042152022M722686Q2018270BK20200044Li WLiu YGuo XLi QXu HPang HShi YfalseEmbedding Atomically Dispersed Iron Sites in Nitrogen-Doped Carbon Frameworks-Wrapped Silicon Suboxide for Superior Lithium Storage.Silicon suboxide (SiO_x ) has attracted widespread interest as Li-ion battery (LIB) anodes. However, its undesirable electronic conductivity and apparent volume effect during cycling impede its practical applications. Herein, sustainable rice husks (RHs)-derived SiO₂ are chosen as a feedstock to design SiO_x /iron-nitrogen co-doped carbon (Fe-N-C) materials. Using a facile electrospray-carbonization strategy, SiO_x nanoparticles (NPs) are encapsulated in the nitrogen-doped carbon (N-C) frameworks decorating atomically dispersed iron sites. Systematic characterizations including high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) and X-ray absorption fine structure (XAFS) verify the existence of Fe single atoms and typical coordination environment. Benefiting from its structural and compositional merits, the SiO_x /Fe-N-C anode delivers significantly improved discharge capacity of 799.1 mAh g^-1 , rate capability, and exceptional durability, compared with pure SiO₂ and SiO_x /N-C, which has been revealed by the density functional theory (DFT) calculations. Additionally, the electrochemical tests and in situ X-ray diffraction (XRD) analysis reveal the oxidation of Li_x Si phase and the storage mechanism. The synthetic strategy is universal for the design and synthesis of metal single atoms/clusters dispersed N-C frameworks encapsulated SiO_x NPs. Meanwhile, this work provides impressive insights into developing various LIB anode materials suffering from inferior conductivity and huge volume fluctuations.2023-01-01T00:00:00Z2023 Feb2026-03-31T10:59:06.931Z2025-04-19T13:31:40.469ZS-EPMC98960723647065410.1002/advs.202206084