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Oxygen-deficient titanium dioxide as a functional host for lithium–sulfur batteries

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Abstract

The shuttling of polysulfides with sluggish redox kinetics has severely retarded the advancement of lithium–sulfur (Li–S) batteries. In this work oxygen-deficient titanium dioxide (TiO2) has been investigated as a novel functional host for Li–S batteries. Experimental and first-principles density functional theory (DFT) studies reveal that oxygen vacancies Image ID:c9ta01598a-t1.gif help to reduce polysulfide shuttling and catalyze the redox kinetics of sulfur/polysulfides during cycling. Consequently, the resulting TiO2/S composite cathode manifests superior electrochemical properties in terms of high capacity (1472 mA h g−1 at 0.2C), outstanding rate capability (571 mA h g−1 at 2C), and excellent cycling properties (900 mA h g−1 over 100 cycles at 0.2C). The present strategy offers a viable way through vacancy engineering for the design and optimization of high-performance electrodes for advanced Li–S batteries and other electrochemical devices.

Graphical abstract: Oxygen-deficient titanium dioxide as a functional host for lithium–sulfur batteries

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Publication details

The article was received on 12 Feb 2019, accepted on 18 Mar 2019 and first published on 05 Apr 2019


Article type: Paper
DOI: 10.1039/C9TA01598A
Citation: J. Mater. Chem. A, 2019, Advance Article

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    Oxygen-deficient titanium dioxide as a functional host for lithium–sulfur batteries

    H. Wang, K. Yin, N. Qin, X. Zhao, F. Xia, Z. Hu, G. Guo, G. Cao and W. Zhang, J. Mater. Chem. A, 2019, Advance Article , DOI: 10.1039/C9TA01598A

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