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

作者：Zhang, Qi; Zeng, Yaping^*; Ling, Changsheng; Wang, Liu; Wang, Zhiyong^*; Fan, Tian-E; Wang, Heng; Xiao, Jianrong; Li, Xinyu; Qu, Baihua^*

来源：Small, 2022, 18(13): 2107514.

DOI：10.1002/smll.202107514

• sodium-ion batteries
• charge-transfer kinetics
• ultra-long lifespans
• heterointerface engineering
• 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 (Sb2S3 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 Sb2S3/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.

• 单位
  桂林理工大学; 重庆大学