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

Xuecheng Li, Guanlun Guo, Ning Qin, Zhao Deng, Zhouguang Lu, Dong Shen, Xu Zhao, Yu Li, Bao Lian Su, Hong En Wang

Résultats de recherche: Contribution à un journal/une revueArticleRevue par des pairs

Résumé

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.

langue originaleAnglais
Pages (de - à)15505-15512
Nombre de pages8
journalNanoscale
Volume10
Numéro de publication33
Les DOIs
Etat de la publicationPublié - 7 sept. 2018

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