Free‐standing electrodes with high energy density and long life are of critical importance to the development of lithium‐ion batteries (LIBs) for flexible/wearable electronic devices. Herein, the free‐standing and foldable V₂O₃/multichannel carbon nanofibers (V₂O₃/MCCNFs) composites are prepared via electrospinning and subsequent carbonization. Such V₂O₃/MCCNFs electrode delivers a superior capacity of 881.1 mAh g⁻¹ at 0.1 A g⁻¹ after 240 cycles. More importantly, the ultralong lifespan is achieved with a high capacity of 487.8 mAh g⁻¹ even after 5000 cycles at a high current density of 5 A g⁻¹ with only 0.00323% decay rate, which shows the best performance among the reported V₂O₃‐based anodes and other metal oxides based free‐standing anodes. Furthermore, this flexible electrode is further applied to the pouch cell, which exhibits prominent capacity of 348.3 mAh g⁻¹ after 500 cycles at 1 A g⁻¹ with 0.094% decay per cycle. The unprecedented performance can be ascribed to synergetic contributions of V₂O₃ and multichannel carbon nanofibers, which not only promote the penetration of electrolyte and reduce the transport length of Li⁺, but also increase active material/electrolyte contact area and buffer the volume change. This work paves the way to develop free‐standing electrode for flexible/wearable electronic devices with ultralong lifespan.

中文翻译：

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可自由站立的，可折叠的V2O3 /多通道碳纳米纤维电极，用于超长寿命的柔性锂离子电池

具有高能量密度和长寿命的自立式电极对于开发用于柔性/可穿戴电子设备的锂离子电池（LIB）至关重要。在此，通过电纺丝和随后的碳化来制备自立且可折叠的V ₂ O ₃ /多通道碳纳米纤维（V ₂ O ₃ / MCCNFs）复合材料。这样的V ₂ O ₃ / MCCNFs电极在240个循环之后在0.1A g ^-1时提供881.1mAh g ^-1的优异容量。更重要的是，即使在5 A g的高电流密度下经过5000次循环后，仍具有487.8 mAh g ^-1的高容量，可实现超长寿命^-1，衰减率仅为0.00323％，在报告的基于V ₂ O ₃的阳极和其他基于金属氧化物的自立阳极中显示出最佳性能。此外，该柔性电极还被应用于袋式电池，该袋式电池在1A g ^-1下500次循环后表现出显着的容量348.3 mAh g ^-1，每循环衰减0.094％。V ₂ O ₃和多通道碳纳米纤维的协同作用可归因于空前的性能，它们不仅促进了电解质的渗透并缩短了Li ⁺的传输长度，还可以增加活性物质/电解质的接触面积并缓冲体积变化。这项工作为开发具有超长使用寿命的柔性/可穿戴电子设备的独立式电极铺平了道路。