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【目的】Fe_7S8具有理论比容量高、成本低的优点，是一类富有潜力的钾离子电池负极材料.然而其固有的低电导率和较大的体积膨胀严重限制了实际应用.黏结剂本身的力学性能及其与活性物质的相互作用对固态电解质(SEI)膜的形成起着关键的作用，稳定的SEI膜能够有效提高电池的循环稳定性.本研究通过使用不同黏结剂，改善了铁基硫化物负极SEI膜的稳定性，缓解了循环过程中由于体积变化引起的电极粉化和脱落等问题.【方法】采用静电纺丝法结合高温硫化制备了Fe_7S8/C纳米纤维(Fe_7S8/CNFs)负极材料，使用聚丙烯酸(PAA)和聚偏氟乙烯(PVDF)作为黏结剂制备不同的电极，分别命名为Fe_7S8/CNFs-PAA和Fe_7S8/CNFs-PVDF,并使用物理表征和电化学测试分析了PAA能够改善电池性能的原因.【结果】对比发现，Fe_7S8/CNFs-PAA电极在100 mA·g-1下循环150次后具有412.1 mAh·g-1的可逆放电比容量，而Fe_7S8/CNFs-PVDF电极仅有154.0 mAh·g-1.在2 000 mA·g-1的大电流下，Fe_7S8/CNFs-PAA电极可提供214.4 mAh·g-1的高容量.即使在1 000 mA·g-1下，经过1 000次循环后，仍能保持191.1 mAh·g-1的可逆容量，而Fe_7S8/CNFs-PVDF电极容量迅速衰减，仅为39.9 mAh·g-1.【结论】Fe_7S8/CNFs-PAA优异的电化学性能主要是由于PAA黏结剂能实现Fe_7S8活性材料间的稳定黏合，并促进电极表面SEI膜的形成，从而使Fe_7S8/CNFs-PAA电极具有更小的电化学阻抗及优异的抗应变能力，有利于充放电时电子/离子的快速传输及循环稳定性的提升.
Abstract：【Objective】Fe_7S8 possesses high theoretical specific capacity and low cost, making it a promising anode material for potassium-ion batteries.However, its inherent low electrical conductivity and significant volume expansion severely limit practical applications.The mechanical properties of the binder itself and its interaction with the active material play a crucial role in the formation of the solid electrolyte interphase(SEI) film.A stable SEI film can effectively enhance the battery′s cycling stability.This study employed diverse binders to enhance the stability of the SEI film on iron-based sulphide anodes, mitigating issues such as electrode pulverisation and detachment caused by volume changes during cycling.【Method】Fe_7S8/C nanofibre(Fe_7S8/CNFs) anode material was prepared via electrospinning combined with high-temperature vulcanisation.Electrodes were fabricated using polyacrylic acid(PAA) and polyvinylidene fluoride(PVDF) as binders, designated Fe_7S8/CNFs-PAA and Fe_7S8/CNFs-PVDF respectively.Physical characterisation and electrochemical testing analysed the mechanism by which PAA enhances battery performance.【Result】Comparative analysis revealed that the Fe_7S8/CNFs-PAA electrode exhibited a reversible discharge capacity of 412.1 mAh·g-1 after 150 cycles at 100 mA·g-1, whereas the Fe_7S8/CNFs-PVDF electrode yielded only 154.0 mAh·g-1.At a high current of 2 000 mA·g-1, the Fe_7S8/CNFs-PAA electrode delivered a high capacity of 214.4 mAh·g-1.Even at 1 000 mA·g-1, the reversible capacity remained at 191.1 mAh·g-1 after 1 000 cycles, whereas the Fe_7S8/CNFs-PVDF electrode exhibited rapid capacity decay to only 39.9 mAh·g-1.【Conclusion】The superior electrochemical performance of Fe_7S8/CNFs-PAA stems primarily from the PAA binder, which achieves stable bonding between Fe_7S8 active materials and promotes the formation of the SEI film on the electrode surface.This endows the Fe_7S8/CNFs-PAA electrode with lower electrochemical impedance and excellent strain resistance, facilitating rapid electron/ion transport during charge/discharge cycles and enhancing cycling stability.
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基本信息:
DOI：10.13715/j.issn.2096-644X.20250503.0001
中图分类号:TQ437;TM912;TQ340.64
引用信息:
[1]雷坤婷,丁燕怀,尹睿,等.静电纺丝制备Fe_7S_8/C纳米纤维及黏结剂对其储钾性能影响分析[J].湘潭大学学报(自然科学版),2026,48(01):13-26.DOI:10.13715/j.issn.2096-644X.20250503.0001.
基金信息:
国家自然科学基金项目(52372230)
2025-07-14
2025-07-14
2025-07-14