4.8 Article

Two-dimensional organic-inorganic heterostructures of in situ-grown layered COF on Ti3C2 MXene nanosheets for lithium-sulfur batteries

期刊

NANO TODAY
卷 35, 期 -, 页码 -

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.nantod.2020.100991

关键词

Covalent organic framework; Ti3C2 nanosheets; Dual-site adsorption; High sulfur content; Li-S batteries

资金

  1. National Natural Science Foundation [51972235, 21875141]
  2. Natural Science Foundation of Shanghai [17ZR1447800]
  3. Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning, Hundred Youth Talent Plan of Tongji University
  4. Fundamental Research Funds for the Central Universities
  5. Shanghai Pujiang Program [18PJ1409000]
  6. China National Postdoctoral Program for Innovative Talents [BX20200117]
  7. China Postdoctoral Science Foundation [2020M672472]

向作者/读者索取更多资源

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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