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Enhanced Na+ pseudocapacitance in P, S co-doping carbon anode: raising from the surface modification by sulfur and phosphorus with C-S-P coupling

Abstract

Enhanced phosphorus (7.2 wt%) and sulfur (15.7 wt%) co-doped carbon (PSC) is synthesized via one step sintering the carbon disulfide and red phosphorus in vacuum. It is found that S atoms can act as immobilization sites for phosphorus by covalently bonding with P atoms in the form of C-S-P, thus high-level doping of phosphorus can be realized. Owing to the high-level doping, this co-doped carbon shows enlarged interlayer spacing, improved charge transfer capability and strong adsorption of Na+ ions. When tested as anode for sodium ion batteries, this PSC delivers a high reversible capacity of 513.8 mAh g-1 at 100 mA g-1, excellent rate capability of 181.8 mAh g-1 at 10 A g-1 and superior cycling stability of a capacity of 290.1mAh g-1 after 1000 cycles at 1A g-1.

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Publication details

The article was received on 21 Oct 2019, accepted on 28 Nov 2019 and first published on 02 Dec 2019


Article type: Paper
DOI: 10.1039/C9TA11594C
J. Mater. Chem. A, 2019, Accepted Manuscript

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    Enhanced Na+ pseudocapacitance in P, S co-doping carbon anode: raising from the surface modification by sulfur and phosphorus with C-S-P coupling

    J. Yan, W. Li, P. Feng, R. Wang, M. Jiang, J. Han, S. Cao, K. Wang and K. Jiang, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C9TA11594C

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