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Alleviating the polysulfides “shuttling” and improving the sulfur utilization ably by the micropores of MOFs materials
Author(s) -
Fan Chaojiang,
Yang Rong,
Liu Ying,
Chen Dan,
Chen Liping,
Liu Rui,
Yan Yinglin,
Zou Yiming,
Xu Yunhua
Publication year - 2021
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.6516
Subject(s) - faraday efficiency , microporous material , sulfur , electrochemistry , chemical engineering , adsorption , battery (electricity) , hydrothermal circulation , chemistry , octahedron , lithium–sulfur battery , electrode , materials science , nanotechnology , ion , organic chemistry , power (physics) , physics , quantum mechanics , engineering
Summary The irreversible capacity fade, low Coulombic efficiency and sulfur utilization rate caused by the “shuttle” of polysulfides are serious drawbacks of lithium sulfur (Li‐S) battery. Here, a regular octahedral structure and abundant hierarchical porous S/MIL‐101(Cr)‐H, as the electrode of Li‐S battery to catch and anchor polysulfides for alleviating the “shuttle effect” and strengthening the utilization of S, were synthesized by usual hydrothermal and facile heat treatment. Consequently, compared with S/MIL‐101(Cr) (719.52 mA h g −1 ), S/MIL‐101(Cr)‐H shows better initial discharge capacity (1073.59 mA h g −1 ) and the reversible capacity remains (446.59 mA h g −1 ) after 100 cycles at 0.1C, which is much greater than S/MIL‐101(Cr). A capacity of 504.26 mA h g −1 and Coulombic efficiency of approximately 95% at 0.5 C were obtained. The better electrochemical property is ascribed to the coordinated effect of the adsorption of microporous structure and chemical bonding of Cr‐S, which can effectively capture the soluble polysulfides and alleviate “shuttle effect” through physical confinement and chemical anchoring.