Sodium-ion batteries (SIBs) have been attracting considerable attention as a promising candidate for large-scale energy storage because of the abundance and low-cost of sodium resources. However, lack of appropriate anode materials impedes further applications. Herein, a novel self-template strategy is designed to synthesize uniform flowerlike N-doped hierarchical porous carbon networks (NHPCN) with high content of N (15.31 at.%) assembled by ultrathin nanosheets via a self-synthesized single precursor and subsequent thermal annealing. Relying on the synergetic coordination of benzimidazole and 2-methylimidazole with metal ions to produce a flowerlike network, a self-formed single precursor can be harvested. Due to the structural and compositional advantages, including the high N doping, the expanded interlayer spacing, the ultrathin two-dimensional nano-sized subunits, and the three-dimensional porous network structure, these unique NHPCN flowers deliver ultrahigh reversible capacities of 453.7 mAh·g⁻¹ at 0.1 A·g⁻¹ and 242.5 mAh·g⁻¹ at 1 A·g⁻¹ for 2,500 cycles with exceptional rate capability of 5 A·g⁻¹ with reversible capacities of 201.2 mAh·g⁻¹. The greatly improved sodium storage performance of NHPCN confirms the importance of reasonable engineering and synthesis of hierarchical carbon with unique structures.

钠离子电池（SIB）由于钠资源丰富且成本低廉，已成为大规模储能的有前途的候选者而受到了广泛的关注。然而，缺乏合适的阳极材料阻碍了进一步的应用。在本文中，设计了一种新颖的自模板策略，以合成由超薄纳米片通过自合成的单个前驱体组装的均匀的花状N掺杂的分级多孔碳网络（NHPCN），其中N含量高（15.31 at。％）。 。依靠苯并咪唑和2-甲基咪唑与金属离子的协同配位以产生花状网络，可以收获自形成的单一前体。由于结构和成分上的优势，包括高N掺杂，扩展的层间间距，^-1 0.1 A·^克-1和242.5毫安·^克-1 1个A·^克-1为2500个循环，5 A的特殊速率能力·^克-1与201.2毫安的可逆容量·^克-1。NHPCN的钠存储性能大大提高，证实了合理工程设计和合成具有独特结构的分级碳的重要性。