High-performance rechargeable aqueous Zn-ion batteries with a poly(benzoquinonyl sulfide) cathode

We report high-performance aqueous Zn-ion batteries consisting of a zinc anode, a poly(benzoquinonyl sulfide) (PBQS) cathode, and a 3 M Zn(CF 3 SO 3 ) 2 aqueous electrolyte. The PBQS cathode displays an initial discharge capacity of 203 mA h g −1 at 0.1C and a good capacity retention of 86% after 50...

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Bibliographic Details
Published inInorganic chemistry frontiers Vol. 5; no. 6; pp. 1391 - 1396
Main Authors Dawut, Gulbahar, Lu, Yong, Miao, Licheng, Chen, Jun
Format Journal Article
LanguageEnglish
Published London Royal Society of Chemistry 01.06.2018
Subjects
Aqueous electrolytes
Carbonyls
Cathodes
Discharge
Infrared spectra
Inorganic chemistry
Molecular chains
Oxygen atoms
Rechargeable batteries
Redox reactions
Zinc
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Summary:We report high-performance aqueous Zn-ion batteries consisting of a zinc anode, a poly(benzoquinonyl sulfide) (PBQS) cathode, and a 3 M Zn(CF 3 SO 3 ) 2 aqueous electrolyte. The PBQS cathode displays an initial discharge capacity of 203 mA h g −1 at 0.1C and a good capacity retention of 86% after 50 cycles at 0.2C. The PBQS cathode can deliver a high reversible capacity of 126 mA h g −1 at a high rate of 5.0C. Meanwhile, we also studied the redox mechanism during discharge/charge processes by ex situ infrared spectra and theoretical calculations, revealing that reversible bonding of Zn 2+ ions with carbonyl oxygen atoms in PBQS occurs in the redox reactions of PBQS molecules. The redox reactions of PBQS molecules can be regarded as the reversible bonding of Zn 2+ ions with carbonyl oxygen atoms in PBQS.
ISSN:2052-1553
2052-1545
2052-1553
DOI:10.1039/C8QI00197A