Furthermore, the long-term cycling performances of pure COF@bio, COF@bio-20, COF@bio/40, and CNT were also evaluated under the same conditions (Figs. ). The discharge capacities of COF@bio-20 and pure COF@bio showed similar trends of increase followed by a decrease, akin to COF@bio-40. However, COF@bio-40 required less activation time and delivered a higher capacity. The maximum capacity of COF@bio-20 in the long-term cycle test reached 558 mAh g⁻¹, stabilizing at 166 mAh g⁻¹ under 2,000 mA g⁻¹ (Fig. ). In contrast, pure COF exhibited a maximum capacity of only 243 mAh g⁻¹, stabilizing at 183 mAh g⁻¹ by the five-hundred-fourth cycle under similar conditions (Fig. ). The higher maximum capacity of COF@bio-20 compared to COF@bio may be related to the presence of CNT. Regarding COF@bio/40 (Fig. ), the specific capacity initially peaked at about 500 mAh g⁻¹, then dropped rapidly before stabilizing at 128 mAh g⁻¹. The low specific capacity of COF@bio/40 may be linked to the limited exposure and utilization of active sites, indicating that the in-situ growth method was superior to simple physical mixing. For pure CNT, the specific capacity quickly stabilized at only 228 mAh g⁻¹ under 2,000 mA g⁻¹ (Fig. ), demonstrating the vital role of CNT in COF@bio-20 and COF@bio-40.