Ultrafast and ultrastable FeSe2embedded in nitrogen-doped carbon nanofibers anode for sodium-ion half/full batteries

Chen Chen; Qilin Hu; Hongyu Xue; Han Li; Wenkai Li; Shuai Cao; Tao Peng; Ya Yang; Yongsong Luo

doi:10.1088/1361-6528/ad06d7

Ultrafast and ultrastable FeSe₂embedded in nitrogen-doped carbon nanofibers anode for sodium-ion half/full batteries

Nanotechnology. 2023 Nov 17;35(5). doi: 10.1088/1361-6528/ad06d7.

Authors

Chen Chen¹, Qilin Hu¹, Hongyu Xue¹, Han Li¹, Wenkai Li¹, Shuai Cao¹, Tao Peng¹, Ya Yang¹, Yongsong Luo^{1

2}

Affiliations

¹ Key Laboratory of Microelectronics and Energy of Henan Province, Henan Joint International Research Laboratory of New Energy Storage Technology, School of Physics and Electronic Engineering, Xinyang Normal University, Xinyang 464000, People's Republic of China.
² School of Physics and Electronic Engineering, Nanyang Normal University, Nanyang 473061, People's Republic of China.

PMID: 37879321
DOI: 10.1088/1361-6528/ad06d7

Abstract

Transition metal selenides are considered as promising anode materials for fast-charging sodium-ion batteries due to their high theoretical specific capacity. However, the low intrinsic conductivity, particle aggregation, and large volume expansion problems can severely inhibit the high-rate and long-cycle performance of the electrode. Herein, FeSe₂nanoparticles embedded in nitrogen-doped carbon nanofibers (FeSe₂@NCF) have been synthesized using the electrospinning and selenization process, which can alleviate the volume expansion and particle aggregation during the sodiation/desodiation and improve the electrical conductivity of the electrode. The FeSe₂@NCF electrode delivers the outstanding specific capacity of 222.3 mAh g^-1at a fast current density of 50 A g^-1and 262.1 mAh g^-1at 10 A g^-1with the 87.8% capacity retention after 5000 cycles. Furthermore, the Na-ion full cells assembled with pre-sodiated FeSe₂@NCF as anode and Na₃V₂(PO₄)₃/C as cathode exhibit the reversible specific capacity of 117.6 mAh g^-1at 5 A g^-1with the 84.3% capacity retention after 1000 cycles. This work provides a promising way for the conversion-based metal selenides for the applications as fast-charging sodium-ion battery anode.

Keywords: FeSe2 nanoparticles; electrospinning; fast charging; full batteries; long-cycle performance.