Journal
NANO TODAY
Volume 35, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.nantod.2020.100991
Keywords
Covalent organic framework; Ti3C2 nanosheets; Dual-site adsorption; High sulfur content; Li-S batteries
Categories
Funding
- National Natural Science Foundation [51972235, 21875141]
- Natural Science Foundation of Shanghai [17ZR1447800]
- Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning, Hundred Youth Talent Plan of Tongji University
- Fundamental Research Funds for the Central Universities
- Shanghai Pujiang Program [18PJ1409000]
- China National Postdoctoral Program for Innovative Talents [BX20200117]
- China Postdoctoral Science Foundation [2020M672472]
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The development of sulfur host materials with simultaneous suppressed shuttle effect, improved electrical/ionic conductivity and high sulfur loading is highly desired for lithium-sulfur batteries. Herein, we proposed that two-dimensional heterostructures made of layered covalent triazine framework on Ti3C2 MXene nanosheets (CTF/TNS) as a sulfur host show multiple-in-one advantages for lithium-sulfur batteries. The integrity of organic CTF with ordered pore structure and inorganic TNSs with high conductivity imparts the heterostructures three-dimensional spatial confinement for high sulfur loading and efficient electron/ion transport for improved reaction kinetics. In addition, lithiophilic N sites in CTF and sulfurophilic Ti sites in TNSs enable dual-site chemical anchoring of polysulfides to effectively suppress shuttle effect. With a high sulfur loading of 76 wt%, the S@CTF/TNS cathode shows high reversible capacity (1441 mAh g(-1) at 0.2 C), outstanding cycling stability (up to 1000 cycles at 1 C with a 0.014 % capacity decay rate per cycle) and excellent rate capability. Notably, even with a high areal sulfur loading of 5.6 mg cm(-2), a high capacity retention of 94 % is still obtained after 100 cycles. (C) 2020 Elsevier Ltd. All rights reserved.
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