Sodium ion batteries have been suffering low reversible capacity, poor rate, and less cycling reliability upon sodiation/desodiation. To address those formidable issues, electrospinning combined with hard template route is adopted here to collect loofah‐like nitrogen‐doped hollow carbon nanofibers (NHCNFs) derived from sustainable and low‐cost resources, that is, renewable acrylic yarn. NHCNFs render a remarkable reversible capacity of 143 mAh g⁻¹ for 5000 cycles at a current density of 10 A g⁻¹ at ambient temperature. More importantly, NHCNFs possesses an impressive capability in tackling the elevated temperature environment, affording an admirable reversible capacity of 156 mAh g⁻¹ at a high rate of 15 A g⁻¹ even after 10 000 cycles under 50 °C. These superior performances could be attributed to the combination of the following factors: delicately designed microstructure with hollow bead‐like channels, pseudocapacitive behavior and accelerated kinetics. Such an excellent attribute enables loofah‐like NHCNFs to be a promising low‐cost and environment‐friendly anode for sodium ion rechargeable batteries.

中文翻译：

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氮掺杂空心碳纳米纤维阳极在高温下的快速储钠和超长循环寿命

钠离子电池的可逆容量低，速率低，并且在进行糖化/脱氧处理后循环可靠性较低。为了解决这些棘手的问题，此处采用静电纺丝与硬模板工艺相结合的方法，收集源自可持续和低成本资源（即可再生丙烯酸纱线）的丝瓜状掺氮空心碳纳米纤维（NHCNF）。NHCNF在环境温度下以10 A g ^-1的电流密度提供5000次循环时143 mAh g ^-1的显着可逆容量。更重要的是，NHCNFs在应对高温环境方面具有令人印象深刻的能力，在15 A g ^-1的高速率下可提供156 mAh g ^-1的可逆容量即使在50°C下进行10000次循环之后。这些优异的性能可归因于以下因素的组合：精心设计的具有空心珠状通道的微观结构，拟电容行为和加速动力学。如此优异的性能使类似丝瓜络的NHCNFs成为钠离子可充电电池极有希望的低成本，环保阳极。