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Covalent organic frameworks (COFs), featuring designable topological structures and tunable pore architectures, have shown promising potential as cathode materials for high−performance lithium−ion batteries (LIBs). However, the energy density and cycling stability of COFs−based cathodes remain difficult to further improve due to their single type of redox−active centers (n−type or p−type) and intrinsically low electrical conductivity. To address these limitations, a highly conjugated copper porphyrin−based covalent organic framework with bipolar redox−active centers (TBP−COF−Cu) was constructed. The incorporation of Cu2+ ions into the porphyrin units significantly enhances the electronic transport capability of the framework, improves the utilization efficiency of active sites, and effectively promotes lithium−ion diffusion kinetics. When employed as a LIB cathode, TBP−COF−Cu delivers a high specific discharge capacity of 288 mA·h/g at 0.1 A/g, corresponding to an energy density of 639 W·h/kg. Even at a high current density of 5 A/g, a capacity of 81 mA·h/g is retained. After 5000 charge–discharge cycles, the capacity decay rate is as low as 0.0038%, with a capacity retention of 81%. In addition, TBP−COF−Cu exhibits fast ion transport behavior, with a lithium−ion diffusion coefficient of 8.02×10−10 cm2/s. This work provides an effective strategy for designing organic LIB cathode materials that simultaneously achieve high energy density and high−rate performance.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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