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Covalent sulfur confined in mesoporous hollow carbon spheres for effective kinetic regulation of room-temperature sodium-sulfur batteries

Nano Energy, ISSN: 2211-2855, Vol: 118, Page: 108958
2023
  • 17
    Citations
  • 0
    Usage
  • 11
    Captures
  • 0
    Mentions
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Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    17
    • Citation Indexes
      17
  • Captures
    11

Article Description

Room-temperature sodium-sulfur batteries have attracted extensive attention as a cost-effective and high theoretical energy density next-generation energy storage systems. However, the insulating nature of sulfur, the sluggish reactivity of sulfur with sodium, and severe dissolution of polysulfide are the main challenges of this technology. Here, we propose a covalent sulfur bond breakage mechanism by bonding of sulfur chain onto the inner cavity of the sulfydryl-functionalized mesoporous hollow carbon spheres (MHCS) to efficiently promote the generation of short-chain sodium polysulfide and accelerate polysulfide redox kinetics. The covalent sulfur confined MHCS (S@MHCS) cathode delivers an unprecedented rate capability (250 mAh g −1 at 5 C) and exhibits excellent long-term cycling stability over 1000 cycles at 1 C with a high cathode loading of 5 mg cm −2. Moreover, the associated electrochemical reaction mechanism is also revealed by ex-situ X-ray photoelectron spectroscopy and theoretical calculation. This work introduces a novel sulfur cathode design to enhance the performance of room-temperature sodium-sulfur batteries.

Bibliographic Details

Jianmin Luo; Ke Wang; Yue Qian; Peiyu Wang; Huadong Yuan; Ouwei Sheng; Baiheng Li; Huan Wang; Yao Wang; Yujing Liu; Jianwei Nai; Xinyong Tao; Weiyang Li

Elsevier BV

Energy; Materials Science; Engineering

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