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Porous Nitrogen-Doped Carbon Nanofibers Assembled with Nickel Nanoparticles for Lithium-Sulfur Battery

Abstract

High-efficiency cathodes play a key role in pursuit of high-capacity and long-life lithium-sulfur (Li-S) batteries. However, a number of Li-S batteries currently reported suffer from severe drawbacks such as poor electrical conductivity, low S loading, and a deleterious shuttle effect caused by intermediate polysulfides. We report carbonyl groups modified porous N-doped carbon nanofibers (PCNF) assembled with nickel along with high S areal loading for efficient cathodes in Li-S batteries. Outstanding electrochemical performances are attributed to three effects: 1) PCNF afford large inner spaces for high S loading and accommodating volume expansion; 2) high electrical conductivity is provided by carbon nanofibers skeleton, and electrocatalytically active Ni species distributed in both internal to and on surface sites of PCNF further significantly facilitate the kinetics of polysulfides redox reaction; 3) carbonyl anchored on Ni/PCNF can act as immobilizers for anchoring S atoms and enabling polysulfides trapping during cycling. Benefiting from these advantages, this rational cathode design with high S loading (64.8 wt%) exhibits high specific capacity, outstanding rate capability, and good long cycling stability.

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Publication details

The article was received on 05 Sep 2018, accepted on 29 Nov 2018 and first published on 30 Nov 2018


Article type: Paper
DOI: 10.1039/C8NR07220E
Citation: Nanoscale, 2018, Accepted Manuscript
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    Porous Nitrogen-Doped Carbon Nanofibers Assembled with Nickel Nanoparticles for Lithium-Sulfur Battery

    Q. Li, J. Guo, J. Zhao, C. Wang and F. Yan, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR07220E

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