We successfully combined electrospinning with in situ polymerization methods to synthesize the PANI-coated ZnFe₂O₄ nanofibers which possess the abundant pore structure. The lithium storage properties of PANI-coated ZnFe₂O₄ nanofibers as anode materials for lithium-ion batteries have been discussed for the first time. PANI nanoparticles were directly coated on the surface of the ZnFe₂O₄ nanofibers, increasing the electrical conductivity, and also acting as the protect shell to enhance the mechanical strength of material. The electrochemical performance showed that 15% PANI incorporated ZnFe₂O₄ composite nanofibers (ZP-15) exhibited the highest reversible capacity of 1142 mAhg⁻¹ after 50 cycles, which was much higher than that of pure ZnFe₂O₄ nanofibers (628 mAhg⁻¹), 10% PANI incorporated ZnFe₂O₄ composite nanofibers (ZP-10, 975 mAhg⁻¹), and 20% PANI incorporated ZnFe₂O₄ composite nanofibers (ZP-20, 536 mAhg⁻¹). Additionally, the ZP-15 composite nanofibers achieved outstanding cycling rate capacity of 852, 738, 609 and 539 mAhg⁻¹ with current densities range from 500 to 5000 mA g⁻¹, and exhibited a specific capacity of 1082 mAhg⁻¹ when the current reverted to 50 mA g⁻¹ from the high rate charge-discharge cycles. The enhanced electrochemical performance of PANI-coated ZnFe₂O₄ nanofibers can be attributed to the PANI providing a highly electrical conductive medium, which can promote electron transfer and facilitate the Li⁺ transport in the lithiation/delithiation process, also can reduce self-discharge; moreover, the PANI layer covered on the surface of ZnFe₂O₄ nanofibers can be as buffer matrix to restrain the stress of volume expansion to get stable structure.

我们成功地将静电纺丝与原位聚合方法相结合，以合成具有丰富孔结构的PANI涂层ZnFe ₂ O ₄纳米纤维。首次讨论了PANI包覆的ZnFe ₂ O ₄纳米纤维作为锂离子电池负极材料的储锂性能。将PANI纳米颗粒直接涂覆在ZnFe ₂ O ₄纳米纤维的表面上，提高了导电性，还充当了保护壳，以增强材料的机械强度。电化学性能表明15％的PANI掺入了ZnFe ₂ O ₄复合纳米纤维（ZP-15）在50次循环后表现出最高的可逆容量1142 mAhg ^-1，远高于纯ZnFe ₂ O ₄纳米纤维（628 mAhg ^-1），掺有10％PANI的ZnFe ₂ O ₄复合材料的可逆容量。纳米纤维（ZP-10，975 mAhg ^-1）和20％的PANI结合的ZnFe ₂ O ₄复合纳米纤维（ZP-20，536 mAhg ^-1）。此外，ZP-15复合纳米纤维的出色循环速率能力达到852、738、609和539 mAhg ^-1，电流密度范围为500至5000 mA g ^-1并且，当电流从高速率充放电循环恢复为50mA g ^-1时，显示出1082 mAhg ^-1的比容量。PANI涂层的ZnFe ₂ O ₄纳米纤维的电化学性能增强，可以归因于PANI提供了高导电性介质，可以在锂化/脱锂过程中促进电子转移并促进Li ^+的运输，还可以减少自放电; 此外，覆盖在ZnFe ₂ O ₄纳米纤维表面的PANI层可以作为缓冲基体，以抑制体积膨胀的应力，从而获得稳定的结构。