Boosting Fast Sodium Ion Storage by Synergistic Effect of Heterointerface Engineering and Nitrogen Doping Porous Carbon Nanofibers

Heterointerface engineering with multiple electroactive and inactive supporting components is considered an efficient approach to enhance electrochemical performance for sodium-ion batteries (SIBs). Nevertheless, it is still a challenge to rationally design heterointerface engineering and understand the synergistic effect reaction mechanisms. In this paper, the two-phase heterointerface engineering (Sb₂ S₃ and FeS₂ ) is well designed to incorporate into N-doped porous hollow carbon nanofibers (Sb-Fe-S@CNFs) by proper electrospinning design. The obtained Sb-Fe-S@CNFs are used as anode in SIBs to evaluate the electrochemical performance. It delivers a reversible capacity of 396 mA h g^-1 after 2000 cycles at 1 A g^-1 and exhibits an ultra-long high rate cycle life for 16 000 cycles at 10 A g^-1 . The admirable electrochemical performance is mainly attributed to the following reasons: The porous carbon nanofibers serve as an accelerator of the electrons/ions and a buffer to alleviate volume expansion upon long cyclic performance. The abundant phase boundaries of Sb₂ S₃ /FeS₂ exert low Na⁺ adsorption energy and greatly promote the charge transfer in the internal electric field calculated by first-principle density functional theory. Therefore, the as-prepared Sb-Fe-S@CNFs represents a promising candidate for an efficient anode electrode material in SIBs.