Sb/N‐Doped Carbon Nanofiber as a Sodium‐Ion Battery Anode

The electrochemical performance of sodium‐ion battery (SIB), which is considered to have high potential to replace the lithium‐ion battery, in cycling stability at large current density needs to be improved. Herein, a hybrid of antimony nanoparticles and nitrogen‐doped hollow porous hard carbon nanofiber (Sb/N‐HPCNF) is synthesized through electrospinning and in situ replacement. As an anode of SIB, Sb/N‐HPCNF presents excellent cycling stability (281 mAh g −1 after 2000 cycles at 2 A g −1 ). Such a performance mainly stems from the hollow porous structure, which promotes the electrolyte diffusion along the pores and provides more active sites for Na + insertion/extraction. This work provides an ingenious strategy for constructing well‐designed structures for advanced energy storage technology.