Nitrogen (N)-doped carbon is widely used as an anode material for Li-ion battery (LIB). However, the identification of a specific type of N-configuration responsible for Li-ion storage in N-doped carbon is an elusive topic for LIB. Herein, the N-doped porous carbon nanofibers (N-pCNFs) with various atomic percentages of N and different types of N-configurations are prepared by carbonization of polyacrylonitrile-Zeolitic imidazolate framework-8 fibres at 800, 900, and 1000 °C in N₂ atmosphere. The N content of pCNFs-800, N-pCNFs-900, and N-pCNFs-1000 samples are found to be 12.9, 9.4, and 4.8% atomic percentage, respectively. The free-standing/binder-free N-pCNFs-800, N-pCNFs-900, and N-pCNFs-1000 anode electrodes deliver the reversible Li storage capacity of 650, 805, and 520 mAh g⁻¹, respectively at 0.1 C-rate. The ex-situ X-ray diffraction, scanning electron, and transmission electron microscopic results of N-pCNFs-900 indicate the formation of the solid electrolyte interface (SEI) layer. Further, the ex-situ X-ray photoelectron spectroscopy (XPS) analysis of N-pCNFs-900 identifies the presence of LiF, Li_xPF_5-x, Li_xPOF_5-x, Li-O-C, and R-COOLi constituents of the SEI layer and the deconvoluted XPS N1s spectra confirms that the pyridinic-N is responsible for Li-ion storage sites in N-pCNFs.

掺氮（N）的碳被广泛用作锂离子电池（LIB）的负极材料。然而，对于负责锂离子在N掺杂碳中存储的特定N-构型的识别，对于LIB来说是个难以捉摸的话题。本文中，通过在800、900和1000°C下分别碳化聚丙烯腈-沸石咪唑酸酯骨架8纤维，制备具有各种原子百分比的N和不同类型N构型的N掺杂多孔碳纳米纤维（N-pCNFs）。 N ₂气氛。发现pCNFs-800，N-pCNFs-900和N-pCNFs-1000样品的N含量分别为12.9、9.4和4.8％原子百分比。独立/无粘合剂的N-pCNFs-800，N-pCNFs-900和N-pCNFs-1000阳极电极可提供650、805和520 mAh g ^-1的可逆Li存储容量，分别为0.1 C速率。所述非原位的N- PCNFS-900的X-射线衍射，扫描电子，和透射电子显微镜结果表明，该固体电解质界面（SEI）层的形成。此外，非原位的N- PCNFS-900识别LIF存在的X射线光电子能谱（XPS）分析，李_X PF _5-X ，李_X POF _5-X ，栗-OC，和R-COOLi成分SEI层的X射线衍射和去卷积的XPS N1s光谱证实，吡啶-N负责N-pCNFs中的锂离子存储位点。