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Issue 33, 2018
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SnS2/TiO2 nanohybrids chemically bonded on nitrogen-doped graphene for lithium–sulfur batteries: synergy of vacancy defects and heterostructures

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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.

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

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Supplementary files

Article information


Submitted
08 Jun 2018
Accepted
12 Jul 2018
First published
13 Jul 2018

Nanoscale, 2018,10, 15505-15512
Article type
Paper

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

X. Li, G. Guo, N. Qin, Z. Deng, Z. Lu, D. Shen, X. Zhao, Y. Li, B. Su and H. Wang, Nanoscale, 2018, 10, 15505
DOI: 10.1039/C8NR04661A

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