(689e) N-Doped Porous Carbon Materials Produced from Covalent Organic Frameworks As Anode for Lithium-Ion Batteries

Covalent organic frameworks (COFs), a distinctive category of porous crystalline materials comprised of non-metallic elements (H, C, N, and O) interconnected by strong covalent bonds, manifesting in two-dimensional (2D) or three-dimensional (3D) structures. COFs are recognized as ideal precursors for the in-situ doping of heteroatoms into carbon matrix with uniform porosity and designable, precisely ordered porous structure. In this work, nitrogen-containing COFs were directly pyrolyzed to create nitrogen-doped porous carbon material (NPC). NPC shows high reversible charge capacities when used as the anode material in lithium-ion batteries. At current densities of 1A/g and 5A/g, NPC exhibits maximum reversible charge capacities of 436.8 mAh/g and 256.9 mAh/g, respectively. Moreover, the prepared NPC demonstrates excellent cycling stability and keeps Coulombic efficiency near 100% during the1000 cycles at 1A/g and 5000 cycles at 5A/g. These results indicated that excellent electrochemical performance of NPC is attributed to its nitrogen doping, porous structure, and high specific surface area.