Structural Modification and Deformable Design of Electrospun Sn@C Nanofiber Anodes Through Oxide Doping for Flexible Lithium-Ion Batteries

en This link goes to a English section zh This link goes to a Chinese section Size-controllable Sn nanoparticles are designed in this work via oxide doping to be uniformly embedded into flexible N-doped carbon nanofibers, in which the agglomeration and migration of Sn are effectively restrained due to the suppressive effect of selected oxides, including SiO 2 , TiO 2 , and ZnO. Benefiting from unique merits of the embedment structure, such as ultrahigh aspect ratio, superior adhesion, and ideal stability, the flexible freestanding and highly robust electrode (Sn/TiO 2 @C, STC) is fabricated and exhibits a reversible specific capacity of 968.4 mAh g −1 after 100 cycles at 0.1 A g −1 . Moreover, the STC electrode contributes to a cycle lifespan of over 1000 cycles with a high specific capacity of 519.7 mAh g −1 at 1.0 A g −1 and a capacity decay as low as 0.00185% per cycle. Remarkably, practical application potential of the STC electrode was demonstrated by being assembled into a pouch cell, which not only works stably under bending states but also presents a specific capacity of 954.8 mAh g −1 after 150 cycles at 0.1 A g −1 . This composite fiber anode avoids extra use of polymer binder, current collector, and conductive additive, and exhibits a great potential in the practical application of flexible energy storage devices. 摘要 en This link goes to a English section zh This link goes to a Chinese section 本文通过氧化物掺杂手段, 设计出了尺寸可控的Sn纳米颗粒, 并使其均匀嵌入N原子掺杂的柔性碳纳米纤维中。由于氧化物的抑制作用, 包括SiO 2 , TiO 2 和ZnO, Sn相的团聚和迁移问题得到了有效改善。这种嵌入式纤维结构具有超高的长径比、优异的附着力和结构稳定性, 能够制备出柔性且坚固的Sn/TiO 2 @C (STC) 自支撑电极, 其在0.1 A g −1 电流密度下循环100次后可保持968.4 mAh g −1 的可逆比容量。此外, 在1.0 A g −1 电流密度下, STC电极表现出1000圈循环寿命和519.7 mAh g −1 的高比容量, 单圈容量衰减低至0.00185%。通过组装袋状电池来证明该电极材料的实际应用能力, 在弯曲状态下, 袋状电池仍能稳定工作, 0.1 A g −1 下经过150次循环后获得954.8 mAh g −1 比容量。这种复合纳米纤维阳极无需使用粘结剂、集流体和导电剂, 展现出了在柔性储能设备实际应用中的巨大潜力。