ZIF67‐Derived Carbon@SiO2 Anode Materials for Lithium Ion Batteries: Preparation, Characterization, and Performance

Silicon dioxide (SiO 2 ) is considered a promising anode material for lithium‐ion batteries (LIBs) due to its high theoretical specific capacity, low operating potential, and natural abundance. However, its practical application is limited by severe volume expansion and continuous formation of unstable solid electrolyte interphases (SEI), leading to rapid capacity degradation. Herein, a composite material of ZIF67‐derived carbon and SiO 2 (ZIF67‐C@SiO 2 ) was fabricated via a simple in situ coating method to address these issues. The porous and nitrogen‐doped carbon framework from ZIF67 not only accommodates the volume changes of SiO 2 but also enhances electronic conductivity and lithium‐ion diffusion. Electrochemical tests show that ZIF67‐C@SiO 2 delivers a high reversible capacity of 849.7 mAh·g −1 with nearly 100% Coulombic efficiency over 100 cycles. In comparison, pure SiO 2 and ZIF67‐C exhibit much lower capacities of 98.67 mAh·g −1 and 396.5 mAh·g −1 , respectively. Moreover, ZIF67‐C@SiO 2 maintains a capacity of 566 mAh·g −1 after 200 cycles at 1 A·g −1 with a Coulombic efficiency of 99.6%. These results highlight the synergistic effect between ZIF67‐derived carbon and SiO 2 , offering valuable insights into the design of high‐performance SiO 2 ‐based anode materials for next‐generation LIBs.