The carbon material is considered as the promising anode for potassium ion battery owing to the merits of wide source and structural robustness. However, the limited capacity and the slow kinetics limit the development of carbon materials. Herein, the porous nitrogen-and-phosphorus co-doped carbon material are prepared using the O₂-NH₃ reactive pyrolysis of cellulose with the additional phosphating treatment. As compared with the pristine carbon obtained by the direct pyrolysis of cellulose, the capacity of nitrogen-and-phosphorus co-doped carbon rises from 140 to 253 mAh g⁻¹, and the capacity increases significantly even at high current density (from 16 to 76 mAh g⁻¹ at 20 A g⁻¹). Under the guidance of theoretical simulation, the enhancement of potassium storage capacity and kinetics is explored by combining spectral characterization and electrochemical research. On this basis, the synergistic effect of nitrogen and phosphorus co-doping can improve the potassium storage performance. This study has reference significant for heteroatom modification of carbon materials for potassium storage anodes.

碳材料具有来源广泛和结构坚固等优点，被认为是有前途的钾离子电池负极。然而，有限的容量和缓慢的动力学限制了碳材料的发展。_{在此，利用纤维素的O 2} -NH ₃反应性热解和额外的磷化处理制备多孔氮磷共掺杂碳材料。与纤维素直接热解得到的原始碳相比，氮磷共掺杂碳的容量从 140 提高到 253 mAh g ^-1，即使在高电流密度（从 16 到76 mAh g ^-1在 20 A g ^-1）。在理论模拟的指导下，结合光谱表征和电化学研究，探索了钾储存容量和动力学的增强。在此基础上，氮磷共掺杂的协同作用可以提高储钾性能。该研究对储钾负极碳材料的杂原子改性具有参考意义。