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Highly efficient and green fabrication of a modified C nanofiber interlayer for high-performance Li-S batteries

Abstract

Rechargeable Li-S batteries hold great promise for energy storage applications due to exhibiting high theoretical capacity, low cost, and non-toxicity. However, the practical application of these batteries is hindered by their low electronic conductivity and short cycling lifetime. Herein, we present a simple and efficient strategy for improving the performance of Li-S batteries, utilizing excimer ultraviolet radiation to produce a functional C nanofiber interlayer (EUV-CNF). In the presence of water and oxygen, the above irradiation results in the formation of oxygenated functional groups (e.g., OH and C=O) and nanopores on the interlayer surface. Compared to the sulfur cathode with a pristine C nanofiber (CNF) interlayer, that with the EUV-CNF interlayer exhibits a higher capacity of 917 mA h g–1 after 200 cycles at 0.2 C and a lower average capacity fading per cycle (0.16%). This excellent cycling performance is attributed to the functionalization of the CNF interlayer, which not only improves cathode conductivity but also allows effective trapping of polysulfides within the cathode without hampering Li-ion conductivity. Thus, this work presents a simple, efficient, and environmentally friendly approach to improving the performance of Li-S batteries and thus paves the way to expanding their application scope.

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Publication details

The article was received on 01 Nov 2017, accepted on 03 Jan 2018 and first published on 04 Jan 2018


Article type: Paper
DOI: 10.1039/C7TA09641K
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Highly efficient and green fabrication of a modified C nanofiber interlayer for high-performance Li-S batteries

    K. Wu, Y. Hu, Z. Shen, R. Chen, X. He, Z. Cheng and P. Pan, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C7TA09641K

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