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Interwoven V2O5 Nanowire/Graphene Nanoscroll Hybrid Assembled as Efficient Polysulfide-Trapping-Conversion Interlayer for Long-Life Lithium-Sulfur Batteries

Abstract

Introducing an interlayer between cathode and separator has been an alternative strategy for blocking the shuttling of soluble polysulfides in lithium-sulfur (Li-S) batteries, but it still remains a challenge to tailor the interlayer components, structure and chemistry for realizing efficient conversion of polysulfides into insoluble lithium sulfides. Herein, a flexible self-standing hybrid interlayer is engineered by intertwining one-dimensional (1D) V2O5 nanowires (NWs) with graphene nanoscrolls (GNS) into a robust interconnected 3D network to be featured as both upper current collector and physical/chemical polysulfide-trapper. The highly conductive and open GNS framework provide bicontinuous transfer channels for rapid electron and ion transport across the cathode/separator interface, whilst the V2O5 NWs act as ideal redox mediators to dynamically block polysulfide dissolution and facilitate their conversion into sulfides via formation of active intermediate polythionate complexes. Thus, the cells with 70 wt% sulfur content in the whole cathode have a significantly improved performances with a long cycling life of 1000 cycles, a low capacity decay of 0.041% per cycle, and a considerable areal capacity of over 4 mA h cm-2 even at a high sulfur loading of 5.5 mg cm-2. This novel interlayer design strategy holds great potential in promoting the practical use of Li-S batteries.

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Publication details

The article was received on 10 Jul 2018, accepted on 08 Aug 2018 and first published on 09 Aug 2018


Article type: Paper
DOI: 10.1039/C8TA06610H
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Interwoven V2O5 Nanowire/Graphene Nanoscroll Hybrid Assembled as Efficient Polysulfide-Trapping-Conversion Interlayer for Long-Life Lithium-Sulfur Batteries

    Y. Guo, Y. Zhang, Y. Zhang, M. Xiang, H. Wu, H. Liu and S. Dou, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA06610H

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