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Issue 9, 2017
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A thin multifunctional coating on a separator improves the cyclability and safety of lithium sulfur batteries

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Abstract

Lithium–sulfur batteries are one of the most promising next-generation batteries due to their high theoretical specific capacity, but are impeded by the low utilization of insulating sulfur, unstable morphology of the lithium metal anode, and transport of soluble polysulfides. Here, by coating a layer of nano titanium dioxide and carbon black onto a commercial polypropylene separator, we demonstrate a new composite separator that can confine the polysulfides on the cathode side, forming a catholyte chamber, and at the same time block the dendritic lithium on the anode side. Lithium–sulfur batteries using this separator show a high initial capacity of 1206 mA h g−1 and a low capacity decay rate of 0.1% per cycle at 0.5C. Analyses reveal the electrocatalytic effect and the excellent dendrite-blocking capability of the ∼7 µm thick coating.

Graphical abstract: A thin multifunctional coating on a separator improves the cyclability and safety of lithium sulfur batteries

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Publication details

The article was received on 02 May 2017, accepted on 09 Jul 2017 and first published on 17 Jul 2017


Article type: Edge Article
DOI: 10.1039/C7SC01961K
Citation: Chem. Sci., 2017,8, 6619-6625
  • Open access: Creative Commons BY license
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    A thin multifunctional coating on a separator improves the cyclability and safety of lithium sulfur batteries

    G. Xu, Q. Yan, S. Wang, A. Kushima, P. Bai, K. Liu, X. Zhang, Z. Tang and J. Li, Chem. Sci., 2017, 8, 6619
    DOI: 10.1039/C7SC01961K

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