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SnS2/TiO2 Nanohybrids Chemically Bonded on Nitrogen-doped Graphene for Lithium-Sulfur Batteries: Synergy of Vacancy Defects and Heterostructure

Abstract

Despite 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 nitrogen-doped graphene/SnS2/TiO2 (denoted as NG/SnS2/TiO2) nanocomposite to enhance the performance of LSBs. It is found that plentiful sulfur vacancy (Vs) defects and nanosized heterojunctions are created on the NG/SnS2/TiO2 composite as proved by electron paramagnetic resonance, transmission electron microscopy and X-ray photoelectron spectroscopy, which can serve as strong adsorption and activation sites for polar polysulfide intermediates, accelerate their redox reaction, and prevent their dissolution and shuttling. The novel NG/SnS2/TiO2-S cathode delivers a high initial capacity of 1064 mAh/g at 0.5 C and a high level of capacity retention rate of 68% after 500 cycles at 0.5 C.

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Publication details

The article was received on 08 Jun 2018, accepted on 12 Jul 2018 and first published on 13 Jul 2018


Article type: Paper
DOI: 10.1039/C8NR04661A
Citation: Nanoscale, 2018, Accepted Manuscript
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    SnS2/TiO2 Nanohybrids Chemically Bonded on Nitrogen-doped Graphene for Lithium-Sulfur Batteries: Synergy of Vacancy Defects and Heterostructure

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

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