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Type: Journal article
Title: Electron-state confinement of polysulfides for highly stable sodium-sulfur batteries
Author: Ye, C.
Jiao, Y.
Chao, D.
Ling, T.
Shan, J.
Zhang, B.
Gu, Q.
Davey, K.
Wang, H.
Qiao, S.-Z.
Citation: Advanced Materials, 2020; 32(12):1907557-1-1907557-8
Publisher: Wiley
Issue Date: 2020
ISSN: 0935-9648
Statement of
Chao Ye, Yan Jiao, Dongliang Chao, Tao Ling, Jieqiong Shan, Binwei Zhang, Qinfen Gu, Kenneth Davey, Haihui Wang, and Shi-Zhang Qiao
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.
Keywords: 2D materials
confinement of polysulfides
metal-organic frameworks
sodium-sulfur batteries
sulfur cathodes
Rights: © 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
DOI: 10.1002/adma.201907557
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Chemical Engineering publications

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