Figure 4.

a) The 2nd, 3rd, 5th, 10th, 50th, and 100th charge/discharge profiles of NCNF@CS‐6h at 0.2 A g⁻¹ for KIBs (inset is the charge/discharge profiles of the first cycle). b) Charge/discharge capacity and Coulombic efficiency of NCNF@CS‐6h at 0.2 A g⁻¹. Comparison of c) cycling stability and d) rate performance under different current densities of the as‐prepared three NCNF@CS samples. e) Long‐term cycling stability and Coulombic efficiency at a high current density of 2.0 A g⁻¹ over 600 cycles.