Fast Sodium Storage with Ultralong Cycle Life for Nitrogen Doped Hollow Carbon Nanofibers Anode at Elevated Temperature

作者：Chen, Zhuowen; Duan, Huanhuan; Xu, Zhiguang; Chen, Caihong^*; Yan, Yurong^*; Wu, Songping^*

来源：Advanced Materials Interfaces, 2020, 7(9): 1901922.

DOI：10.1002/admi.201901922

• carbon nanofibers
• elevated temperature
• nitrogen doped
• pseudocapacitive
• sodiation
• desodiation

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 degrees 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.