The practical application of Pyrite iron disulfide (FeS₂) as anode material of sodium-ion battery is limited by its low electronic conductivity, large volume changes during charge/discharge. To overcome these challenges, a novel structure design single-walled carbon nanotubes (SWCNTs) composited polyaniline (PANI)-wrapped FeS₂ (FeS₂-PANI-SWCNTs) electrodes are successfully achieved in this work. PANI can protect the FeS₂ particles from collapse and offer a protective layer to relive the polysulfides shuttling effect, and also promote the electron and Na⁺ diffusion during the chemical conversion process. Under the dual protection of PANI and SWCNTs, the FeS₂-PANI-SWCNTs film electrode demonstrates a good structural integrity, which accounts for the excellent rate capability and long cycling performance. In addition, the PANI coating and SWCNT network in the fabricated electrode can synergistically anchor polysulfides and therefore strongly suppress shuttle effect during the charge–discharge processes, resulting in less capacity loss. The anode with a loading 3.2 mg cm⁻² of FeS₂ coated with PANI exhibits the initial coulombic efficiency of 81.5% and delivers a specific capacity of 625.8 mAh g⁻¹ after 100 cycles at 200 mA g⁻¹. High flexible and binder-free FeS₂-PANI-SWCNTs film anode demonstrates a reversible capacity of 537 mAh g⁻¹ after 550 cycles at 1 A g⁻¹. This research may offer an efficient method to improve electrochemical performance of the metal sulfides in sodium-ion batteries.

硫铁矿二硫化铁（FeS ₂）作为钠离子电池负极材料的实际应用受限于其低电导率、充放电过程中体积变化大等问题。为了克服这些挑战，本工作成功地实现了一种新型结构设计的单壁碳纳米管（SWCNTs）复合聚苯胺（PANI）包裹的FeS ₂（FeS ₂ -PANI-SWCNTs）电极。PANI可以保护FeS ₂颗粒不坍塌，并提供保护层以重现多硫化物穿梭效应，并在化学转化过程中促进电子和Na ^+扩散。在 PANI 和 SWCNT 的双重保护下，FeS ₂-PANI-SWCNTs薄膜电极表现出良好的结构完整性，这说明了优异的倍率性能和长循环性能。此外，制备电极中的聚苯胺涂层和单壁碳纳米管网络可以协同锚定多硫化物，因此在充放电过程中强烈抑制穿梭效应，从而减少容量损失。负载3.2 mg cm ^-2的涂有PANI的FeS ₂的阳极表现出81.5%的初始库仑效率，并在200 mA g ^{-1下100次循环后提供625.8 mAh g -1}的比容量。高柔韧性和无粘合剂的 FeS _{2 -PANI-SWCNTs 薄膜阳极表现出 537 mAh g} ^-1的可逆容量在 1 A g ^-1下 550 次循环后。该研究可能为提高钠离子电池中金属硫化物的电化学性能提供一种有效的方法。