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

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Hong-En Wang
  • Kaili Yin
  • Ning Qin
  • Xu Zhao
  • Fan-Jie Xia
  • Zhi-Yi Hu
  • Guanlun Guo
  • Guozhong Cao

Detail(s)

Original languageEnglish
Pages (from-to)10346-10353
Journal / PublicationJournal of Materials Chemistry A
Volume7
Issue number17
Online published5 Apr 2019
Publication statusPublished - 7 May 2019

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 (Vo¨) 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.

Citation Format(s)

Oxygen-deficient titanium dioxide as a functional host for lithium-sulfur batteries. / Wang, Hong-En; Yin, Kaili; Qin, Ning; Zhao, Xu; Xia, Fan-Jie; Hu, Zhi-Yi; Guo, Guanlun; Cao, Guozhong; Zhang, Wenjun.

In: Journal of Materials Chemistry A, Vol. 7, No. 17, 07.05.2019, p. 10346-10353.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review