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Block Copolymer-Derived Porous Carbon Fibers Enable High MnO2 Loading and Fast Charging in Aqueous Zinc-Ion Battery

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dc.contributor.authorGuo, Dongen
dc.contributor.authorZhao, Wenqien
dc.contributor.authorPan, Fupingen
dc.contributor.authorLiu, Guoliangen
dc.date.accessioned2022-08-01T12:51:19Zen
dc.date.available2022-08-01T12:51:19Zen
dc.date.issued2022-04en
dc.description.abstractRechargeable aqueous Zn MnO2 batteries are promising for stationary energy storage because of their high energy density, safety, environmental benignity, and low cost. Conventional gravel MnO2 cathodes have low electrical conductivity, slow ion (de-)insertion, and poor cycle stability, resulting in poor recharging performance and severe capacity fading. To improve the rechargeability of MnO2, strategies have been devised such as depositing micrometer-thick MnO2 on carbon cloth and blending nanostructured MnO2 with additives and binders. The low electrical conductivity of binders and sluggish ion (de)insertion in micrometer-thick MnO2, however, still limit the fastcharging performance. Herein, we have prepared porous carbon fiber (PCF) supported MnO2 cathodes (PCF@MnO2), comprised of nanometer-thick MnO2 uniformly deposited on electrospun block copolymer-derived PCF that have abundant uniform mesopores. The high electrical conductivity of PCF, fast electrochemical reactions in nanometer-thick MnO2, and fast ion transport through porous nonwoven fibers contribute to a high rate capability at high loadings. PCF@MnO2, at a MnO2 loading of 59.1 wt%, achieves a MnO2-based specific capacity of 326 and 184 mAhg(-1) at a current density of 0.1 and 1.0 Ag-1, respectively. Our approach of block copolymer-based PCF as a support for zinc-ion cathode inspires future designs of fastcharging electrodes with other active materials.en
dc.description.notesThis material is based upon work supported by the National Science Foundation under Grant No. DMR-1752611 and the American Chemical Society Petroleum Research Foundation Doctoral New Investigator Award. The authors acknowledge the use of facilities in Nanoscale Characterization and Fabrication Laboratory (NCFL) at the Institute for Critical Technology and Applied Science (ICTAS), Virginia Tech.en
dc.description.sponsorshipNational Science Foundation [DMR-1752611]; American Chemical Society Petroleum Research Foundation Doctoral New Investigator Awarden
dc.description.versionPublished versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.1002/batt.202100380en
dc.identifier.eissn2566-6223en
dc.identifier.issue4en
dc.identifier.othere202100380en
dc.identifier.urihttp://hdl.handle.net/10919/111410en
dc.identifier.volume5en
dc.language.isoenen
dc.publisherWiley-V C H Verlagen
dc.rightsCreative Commons Attribution-NonCommercial-NoDerivatives 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.subjectfast-chargingen
dc.subjectMnO2-based cathodesen
dc.subjectporous carbon fibersen
dc.subjectzinc-ion batteriesen
dc.titleBlock Copolymer-Derived Porous Carbon Fibers Enable High MnO2 Loading and Fast Charging in Aqueous Zinc-Ion Batteryen
dc.title.serialBatteries & Supercapsen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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