The rate performances of the prepared anodes were examined at different current densities. As shown in Fig. , the specific capacity of the COF@bio-40 electrode was retained at 1,068, 946, 854, 789, and 667 mAh g⁻¹ at current densities of 100, 200, 500, 1,000, and 2,000 mA g⁻¹, respectively. When the current density was resumed to 100 mA g⁻¹, the specific capacity of the COF@bio-40 electrode reverted to 1,098 mAh g⁻¹, illustrating that COF@bio-40 exhibited outstanding rate performance and excellent stability. However, the rate performances of CNT, COF@bio, COF@bio-20, and COF@bio/40 were inferior to that of the COF@bio-40 electrode (Figs. S27-30), indicating that COF@bio-40 demonstrated improved lithium-storage performance compared to COF@bio, COF@bio-20, and COF@bio/40. The specific capacity of COF@bio-40 can be attributed to the contributions from both COF@bio and CNT, with CNT exhibiting a