Vanadium-doped graphitic carbon nitride for high performance lithium-sulfur batteries

Yankang Wang; Yanbo Wang; Chunhong Huang; Qiang Zhang; Zhanghaoran Liu; Fengxiang Zhang

doi:10.1039/d3cc03422d

Vanadium-doped graphitic carbon nitride for high performance lithium-sulfur batteries

Chem Commun (Camb). 2023 Nov 9;59(90):13458-13461. doi: 10.1039/d3cc03422d.

Authors

Yankang Wang^{1

2

3}, Yanbo Wang^{1

2

3}, Chunhong Huang^{1

2}, Qiang Zhang^{1

2}, Zhanghaoran Liu^{1

2

3}, Fengxiang Zhang^{1

2

3}

Affiliations

¹ State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116023, PR China. zhangfx@dlut.edu.cn.
² School of Chemical Engineering, Dalian University of Technology, Panjin 124221, PR China.
³ Dalian Leicester Institute, Dalian University of Technology, Panjin 124221, PR China.

PMID: 37877165
DOI: 10.1039/d3cc03422d

Abstract

To promote polysulfide conversion in lithium sulfur batteries (LSB) and alleviate the shuttle effect, we designed and fabricated a novel catalyst of vanadium-doped graphite phase carbon nitride with nitrogen defects (V@gC₃N₄-ND) and high vanadium loading (3.46 at%) by defect engineering and two-step pyrolysis. Employing a V@gC₃N₄-ND modified separator, the LSB yielded capacities of 934 mA h g^-1 at 1C and 404 mA h g^-1 at 4C; the former was retained by 61% and 45% after 500 and 1000 cycles, respectively. In particular, the initial capacity of the battery reached 969 mA h g^-1 at a sulfur loading of 10.0 mg cm^-2. This work provides a facile route to the preparation of high-loading vanadium active site catalysts with nitrogen defects in the support, which are promising for high performance LSB applications.