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A Water Based Synthesis of Ultrathin Hydrated Vanadium Pentoxide Nanosheets for Lithium Battery Application: Free Standing Electrodes or Conventionally Casted Electrodes?
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK). Alexandria University, Egypt.
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
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Number of Authors: 6
2017 (English)In: Electrochimica Acta, ISSN 0013-4686, E-ISSN 1873-3859, Vol. 252, 254-260 p.Article in journal (Refereed) Published
Abstract [en]

Ultrathin hydrated vanadium pentoxide (V2O5 center dot nH(2)O) nanosheets are fabricated via a water based exfoliation technique. The exfoliation process involves reflux of the precursor, 1:4 mixture of VO2 and V2O5, in water at 80 degrees C for 24 h. Operando and ex situ X-ray diffraction (XRD) studies are conducted to follow the structural changes during the exfoliation process. The chemical and thermal analyses suggest that the molecular formula of the nanosheet is (H0.2V1.8V0.2O5)-V-V-O-IV center dot 0.5H(2)O. The V2O5 center dot nH(2)O nanosheets are mixed with 10% of multi-walled carbon nanotube (MW-CNT) to form a composite material assigned as (VOx-CNT). Free standing electrodes (FSE) and conventionally casted electrodes (CCE) of VOx-CNT are fabricated and then tested as a positive electrode material for lithium batteries. The FSE shows reversible capacities of 300 and 97 mAhg(-1) at current densities of 10 and 200 mAhg(-1), respectively. This is better than earlier reports for free-standing electrodes. The CCE delivers discharge capacities of 175 and 93 mAhg(-1) at current densities of 10 and 200 mAhg(-1), respectively.

Place, publisher, year, edition, pages
2017. Vol. 252, 254-260 p.
Keyword [en]
V2O5 center dot nH(2)O nanosheets, lithium battery, free standing, water based synthesis
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:su:diva-148996DOI: 10.1016/j.electacta.2017.08.137ISI: 000413009800030OAI: oai:DiVA.org:su-148996DiVA: diva2:1160558
Conference
10th International Symposium on Electrochemical Impedance Spectroscopy (EIS), Galicia, Spain, June 19-24, 2016
Available from: 2017-11-27 Created: 2017-11-27 Last updated: 2017-11-27Bibliographically approved

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