Electron-State Confinement of Polysulfides for Highly Stable Sodium–Sulfur Batteries

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Chao Ye
  • Yan Jiao
  • Dongliang Chao
  • Tao Ling
  • Binwei Zhang
  • Qinfen Gu
  • Kenneth Davey
  • Haihui Wang
  • Shi-Zhang Qiao

Detail(s)

Original languageEnglish
Article number1907557
Journal / PublicationAdvanced Materials
Volume32
Issue number12
Online published14 Feb 2020
Publication statusPublished - 26 Mar 2020
Externally publishedYes

Abstract

Confinement of polysulfides in sulfur cathodes is pivotal for eliminating the “shuttle effect” in metal–sulfur batteries, which represent promising solutions for large-scale and sustainable energy storage. However, mechanistic exploration and in-depth understanding for the confinement of polysulfides remain limited. Consequently, it is a critical challenge to achieve highly stable metal–sulfur batteries. Here, based on a 2D metal–organic framework (2D MOF), a new mechanism to realize effective confinement of polysulfides is proposed. A combination of in situ synchrotron X-ray diffraction, electrochemical measurements, and theoretical computations reveal that the dynamic electron states of the Ni centers in the 2D MOF enable the interaction between polysulfides and the MOF in the discharge/charge process to be tuned, resulting in both strong adsorption and fast conversion kinetics of polysulfides. The resultant room-temperature sodium–sulfur batteries are amongst the most stable reported so far, thus demonstrating that the new mechanism opens a promising avenue for the development of high-performance metal–sulfur batteries. © 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Research Area(s)

  • 2D materials, confinement of polysulfides, metal–organic frameworks, sodium–sulfur batteries, sulfur cathodes

Citation Format(s)

Electron-State Confinement of Polysulfides for Highly Stable Sodium–Sulfur Batteries. / Ye, Chao; Jiao, Yan; Chao, Dongliang et al.
In: Advanced Materials, Vol. 32, No. 12, 1907557, 26.03.2020.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review