SnS2/TiO2 nanohybrids chemically bonded on nitrogen-doped graphene for lithium-sulfur batteries : synergy of vacancy defects and heterostructures

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

12 Scopus Citations
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Author(s)

  • Xuecheng Li
  • Guanlun Guo
  • Ning Qin
  • Zhao Deng
  • Zhouguang Lu
  • Xu Zhao
  • Yu Li
  • Bao-Lian Su
  • Hong-En Wang

Detail(s)

Original languageEnglish
Pages (from-to)15505-15512
Journal / PublicationNanoscale
Volume10
Issue number33
Early online date13 Jul 2018
Publication statusPublished - 7 Sep 2018

Abstract

Despite their high-energy density, low cost and environmental friendliness, the commercial application of lithium-sulfur batteries (LSBs) has been plagued by their severe capacity decay during long-term cycling caused by polysulfide shuttling. Herein, we demonstrate a synergetic vacancy and heterostructure engineering strategy using a nitrogen-doped graphene/SnS2/TiO2 (denoted as NG/SnS2/TiO2) nanocomposite to enhance the electrochemical performance of LSBs. It is noted that plentiful sulfur vacancy (Vs) defects and nanosized heterojunctions are created on the NG/SnS2/TiO2 composite as proved using electron paramagnetic resonance, transmission electron microscopy and X-ray photoelectron spectroscopy, which can serve as strong adsorption and activation sites for polar polysulfide intermediates, prevent their dissolution/shuttling, and accelerate their redox reaction. The novel NG/SnS2/TiO2-S cathode delivers a high initial capacity of 1064 mA h g-1 at 0.5 C and a high capacity retention rate of 68% after 500 cycles at 0.5 C.

Citation Format(s)

SnS2/TiO2 nanohybrids chemically bonded on nitrogen-doped graphene for lithium-sulfur batteries : synergy of vacancy defects and heterostructures. / Li, Xuecheng; Guo, Guanlun; Qin, Ning; Deng, Zhao; Lu, Zhouguang; Shen, Dong; Zhao, Xu; Li, Yu; Su, Bao-Lian; Wang, Hong-En.

In: Nanoscale, Vol. 10, No. 33, 07.09.2018, p. 15505-15512.

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