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Enhancing Na-ion storage in Na3V2(PO4)3/C cathodes for sodium ion batteries through Br and N co-doping

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Abstract

Na3V2(PO4)3 (NVP) features a three-dimensional open structure, which allows fast migration of Na+ ions, and thus, NVP is a superior cathode material for sodium ion batteries. However, the application of the NVP cathode is limited by its low electronic conductivity. To overcome this limitation, we developed an NVP nanocomposite cathode by doping carbon with bromine (Br) and nitrogen (N) during the sol–gel assisted hydrothermal reaction. The Br- and N-doping leads to the formation of amorphous carbon (a-C) on the surface of NVP particles. The nanocomposite possesses multilevel structures containing both pores with different sizes and aggregated grains (200–300 nm). Since the doped N provides electrons to the carbon matrix, the electronic conductivity of the nanocomposite is enhanced. Br-Doping leads to the drop of activation energy for V4+/V5+ redox reaction. The nanocomposite cathode exhibits a high reversible capacity of 41 mA h g−1 at 10C. Both the superior rate and cycling performances could be attributed to the synergistic effect of the multilevel structure and amorphous carbon.

Graphical abstract: Enhancing Na-ion storage in Na3V2(PO4)3/C cathodes for sodium ion batteries through Br and N co-doping

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Article information


Submitted
28 Dec 2019
Accepted
08 Feb 2020
First published
10 Feb 2020

Inorg. Chem. Front., 2020, Advance Article
Article type
Research Article

Enhancing Na-ion storage in Na3V2(PO4)3/C cathodes for sodium ion batteries through Br and N co-doping

Z. Wang, J. Liu, Z. Du, H. Tao and Y. Yue, Inorg. Chem. Front., 2020, Advance Article , DOI: 10.1039/C9QI01690B

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