期刊
NANOSCALE
卷 10, 期 33, 页码 15505-15512出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8nr04661a
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资金
- National Natural Science Foundation of China [21671096, 51302204]
- National Key R&D Program of China [2016YFA0202602]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT-15R52]
- Basic Research Project of the Science and Technology Innovation Commission of Shenzhen [JCYJ20170412153139454]
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 (V-s) 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.
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