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Carbonized‐MOF as a Sulfur Host for Aluminum–Sulfur Batteries with Enhanced Capacity and Cycling Life
Author(s) -
Guo Yue,
Jin Hongchang,
Qi Zhikai,
Hu Zhiqiu,
Ji Hengxing,
Wan LiJun
Publication year - 2019
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201807676
Subject(s) - faraday efficiency , materials science , battery (electricity) , sulfur , electrochemistry , carbonization , composite number , chemical engineering , cathode , lithium–sulfur battery , carbon fibers , diffusion , nanotechnology , electrode , composite material , scanning electron microscope , metallurgy , chemistry , power (physics) , physics , quantum mechanics , engineering , thermodynamics
The rechargeable aluminum–sulfur (Al–S) battery is a promising next generation electrochemical energy storage system owing to its high theoretical capacity of 1672 mAh g −1 and in combining low‐cost and naturally abundant elements, Al and S. However, to date, its poor reversibility and low lifespan have limited its practical application. In this paper, a composite cathode is reported for Al–S batteries based on S anchored on a carbonized HKUST‐1 matrix (S@HKUST‐1‐C). The S@HKUST‐1‐C composite maintains a reversible capacity of 600 mAh g −1 at the 75th cycle and a reversible capacity of 460 mAh g −1 at the 500th cycle under a current density of 1 A g −1 , with a Coulombic efficiency of around 95%. X‐ray diffraction and Auger spectrum results reveal that the Cu in HKUST‐1 forms S–Cu ionic clusters. This serves to facilitate the electrochemical reaction and improve the reversibility of S during charge/discharge. Additionally, Cu increases the electron conductivity at the carbon matrix/S interface to significantly decrease the kinetic barrier for the conversion of sulfur species during battery operation.