S/N-doped carbon nanofibers affording Fe7S8 particles with superior sodium storage

Authors

Xiu Li, University of WollongongFollow
Tao Liu
Yunxiao Wang, University of WollongongFollow
Shulei Chou, University of WollongongFollow
Xun Xu, University of WollongongFollow
Anmin Cao
Libao Chen

RIS ID

141285

Publication Details

Li, X., Liu, T., Wang, Y., Chou, S., Xu, X., Cao, A. & Chen, L. (2020). S/N-doped carbon nanofibers affording Fe7S8 particles with superior sodium storage. Journal of Power Sources, 451

Abstract

2020 Iron sulfides draw much attention as electrode candidates for sodium-ion batteries (SIBs) due to the rich chemical stoichiometries and high capacity. However, they usually exhibit poor cycling performance due to the large volume change during sodiation/desodiation process. In this work, we embed Fe7S8 nanoparticles into sulfur, nitrogen-doped carbon (S/N-C) nanofibers through electrospinning/sulfurization processes. The heteroatom doped carbon matrixes could effectively protect the Fe7S8 from structural collapse, obtaining a stable cycling performance. Moreover, the conductive matrixes with 1D structure can facilitate the diffusion of electrons, leading to good rate capability. As results, the as-designed Fe7S8@S/N-C nanofibers present a discharge capacity of 347 m Ah g−1 after 150 cycles at 1 A g−1 and a high rate capacity of 220 m Ah g−1 at 5 A g−1 in virtue of unique structural characteristics.