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Electron‐State Confinement of Polysulfides for Highly Stable Sodium–Sulfur Batteries
Author(s) -
Ye Chao,
Jiao Yan,
Chao Dongliang,
Ling Tao,
Shan Jieqiong,
Zhang Binwei,
Gu Qinfen,
Davey Kenneth,
Wang Haihui,
Qiao ShiZhang
Publication year - 2020
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201907557
Subject(s) - sulfur , materials science , electrochemistry , nanotechnology , metal , energy storage , chemical engineering , electrode , chemistry , metallurgy , power (physics) , physics , quantum mechanics , engineering
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.