期刊
JOURNAL OF POWER SOURCES
卷 451, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2020.227790
关键词
Fe7S8; Carbon nanofibers; Anode; Sodium-ion batteries; S; N-co-doping
资金
- Australian Research Council Linkage Project [DP160102627, DE170100928]
- National Natural Science Foundation of China [51771236, U1904216]
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 nanopartides 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.
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