钠离子电池（SIBs）因元素丰度高、成本低，在大规模储能领域具有广阔的应用前景，因此探索潜在的适配钠离子电池电极材料具有重要的研究意义。其中，高容量转化型负极材料硫化铁因元素丰度高、成本低、环境友好等优点备受关注。以活性大红染料为碳源，通过溶剂除杂和高温退火过程合成了小于2 nm超薄氮、硫掺杂碳材料包裹二硫化铁（FeS₂/N，S-C）微米颗粒复合材料。三维连续的碳网络与杂原子掺杂，能够协同促进快速的电子传导，可有效缓解二硫化铁储钠过程中的体积膨胀；同时，质量分数低于4%的极低碳含量有助于提升电极和电池的质量及体积能量密度。研究结果表明，FeS₂/N，S-C电极具有较高的可逆比容量（在0.1 A/g电流密度下可逆比容量达到758 mA·h/g）和优异的倍率性能（在10 A/g电流密度下保持207 mA·h/g的可逆比容量）。该研究工作不仅提供了一种潜在的低成本钠离子电池复合负极材料的制备方法，同时探索了高效氮掺杂碳包覆的新思路。

Sodium?ion batteries（SIBs） have broad application prospects in large?scale energy storage due to their high element abundance and low cost.Therefore，it is of great significance to explore potential electrode materials adapted to sodium?ion batteries.Among them，iron sulfide in high capacity conversion anode materials has attracted much attention due to its advantages of high element abundance，low cost and environmental friendliness.Using reactive scarlet dye as carbon source，2 nm ultra?thin nitrogen and sulfur doped carbon materials coated iron disulfide（FeS₂/N，S-C） micron particle composites were synthesized by solvent impurity removal and high temperature annealing.The three?dimensional conductive carbon network and heteroatomic doping promoted the rapid electron conduction，effectively alleviated the volume expansion during the sodium storage process of FeS₂.At the same time，the very low carbon content（~4%） helped to improve the mass and volumetric energy density of the electrode or cell.The results showed that the FeS₂/N，S-C electrode had high reversible specific capacity（758 mA·h/g at 0.1 A/g） and excellent rate performance（207 mA·h/g at 10 A/g）.This work not only provided a potential low?cost composite anode material for sodium?ion batteries，but also explored a new idea of efficient N-doped carbon coating.