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rGO-CNT aero gel covalently bonded with a nitrogen-rich polymer as a polysulfide adsorptive cathode for high sulfur loading lithium sulfur battery

Abstract

The development of high capacity lithium-sulfur (Li-S) battery is hampered by both the shuttle effect of polysulfide and low sulfur areal loading problems. To inhibit the shuttle effect, a polysulfide adsorptive polymer polyethylenimine (PEI) is covalently bonded with reduced graphene oxide (rGO) in one-step hydrothermal reaction. Meanwhile, multi-wall carbon nanotube (MWCNT) is simultaneously interweaved with rGO. The resultant PEI-rGO-MWCNT aero gel (PEI-GC) provides ample chemisorption domains of amine groups and abundant electric contact sites. Density functional theory (DFT) calculations prove a binding energy of 2.43 eV between PEI and polysulfide. The PEI-GC cell achieved a high capacity of 933 mAh g-1 for the 500th cycle at 1 C, stable rate performance up to 10 C, and low self-discharge rate. The covalent bond between PEI-rGO experiences no degradation during the 500 cycles. Moreover, PEI-GC achieved excellent cycling performance at high sulfur loading up to 18 mg cm-2.

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Publication details

The article was received on 25 Apr 2017, accepted on 08 Jun 2017 and first published on 08 Jun 2017


Article type: Paper
DOI: 10.1039/C7TA03552G
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    rGO-CNT aero gel covalently bonded with a nitrogen-rich polymer as a polysulfide adsorptive cathode for high sulfur loading lithium sulfur battery

    X. Hong, J. Jin, T. Wu, Y. Lu, S. Zhang, C. Chen and Z. Wen, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA03552G

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