Nickle sulfides are attractive anode materials for sodium-ion batteries (SIBs) due to their rich structures and natural abundance. However, their applications are greatly hindered by the large volume expansion and poor cycling properties. The introduction of hollow structures and heteroatom-doped carbon layers are effective ways to solve these issues. Here, nitrogen, sulfur co-doped carbon coated Ni₃S₂ (abbreviated as, Ni₃S₂@NSC) nanotubes were prepared by a novel templating route. During the annealing process, NiS₂ acts as both a precursor to Ni₃S₂ and an S-doped sulfur source. No additional sulfur source was used during the S-doping procedure, suggesting an atomically economic synthesis process. As anodes for sodium-ion half-cells, Ni₃S₂@NSCs exhibited high discharge capacity of 481 mA h g^-1 at 0.1 A g^-1 after 100 cycles with exceptional capacity retention of 98.6%. Furthermore, they maintained excellent rate capability of 318 mA h g^-1 even at elevated current density of 5 A g^-1. Sodium-ion full-cells assembled from the Ni₃S₂@NSC anodes and Na₃V₂(PO₄)₃ (NVP@C) cathodes also presented superior capacities and cyclabilities. These features can be attributed to the N, S co-doped carbon coated hollow structure that provided sufficient contact between the electrode and electrolyte, enhanced surface ion storage performance (capacitive effect), and improved structural stability of electrode materials.

硫化镍由于其丰富的结构和天然的丰度，是钠离子电池（SIB）的有吸引力的阳极材料。但是，它们的应用由于大体积膨胀和差的循环性能而受到极大的阻碍。中空结构和杂原子掺杂碳层的引入是解决这些问题的有效方法。在此，通过新颖的模板化方法制备了氮，硫共掺杂的碳包覆的Ni ₃ S ₂（缩写为Ni ₃ S ₂ @NSC）纳米管。在退火过程中，NiS ₂既是Ni ₃ S ₂的前体以及硫掺杂的硫源 在S掺杂过程中没有使用额外的硫源，这暗示了原子经济的合成过程。作为钠离子半电池的阳极，Ni ₃ S ₂ @NSCs经过100次循环后，在0.1 A g ^-1下表现出481 mA hg ^-1的高放电容量，并具有98.6％的出色容量保持率。此外，即使在5 A g ^-1的高电流密度下，它们也保持了318 mA hg ^-1的出色的速率能力。由Ni ₃ S ₂ @NSC阳极和Na ₃ V ₂（PO ₄）₃组装而成的钠离子全电池（NVP @ C）阴极也具有出色的容量和可循环性。这些特征可以归因于N，S共掺杂的碳涂覆的中空结构，其在电极和电解质之间提供了充分的接触，增强了表面离子的存储性能（电容效应），并改善了电极材料的结构稳定性。