Figure 4.

a,b) CV curves of SiO _x /N–C and SiO _x /Fe–N–C, respectively; c) Cycling stability of the SiO₂, SiO _x /N–C and SiO _x /Fe–N–C samples at 100 mA g⁻¹; d) Rate performance of SiO₂, SiO _x /N–C, and SiO _x /Fe–N–C; e) Long‐term cyclability of SiO _x /Fe–N–C at 5 A g⁻¹. DFT calculations of the SiO _x /Fe–N–C, SiO _x /N–C, and α‐SiO₂ samples. f–h) The calculated geometry configurations; i) The calculated Li adsorption energy; j) The DOS results.