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Materials Compatibility in Rechargeable Aluminum Batteries: Chemical and Electrochemical Properties between Vanadium Pentoxide and Chloroaluminate Ionic Liquids
Univ Calif Riverside, Dept Chem & Environm Engn, Riverside, CA 92521 USA.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
CUNY, Dept Chem Engn, New York, NY 10031 USA.
Univ Calif Riverside, Mat Sci & Engn Program, Riverside, CA 92521 USA.
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2019 (English)In: Chemistry of Materials, ISSN 0897-4756, E-ISSN 1520-5002, Vol. 31, no 18, p. 7238-7247Article in journal (Refereed) Published
Abstract [en]

To demonstrate the importance of electrode/electrolyte stability in rechargeable aluminum (Al) batteries, we investigate the chemical compatibility between vanadium pentoxide (V2O5), a proposed positive electrode material for Al batteries, and the common chloroaluminate ionic liquid electrolytes. We reveal that V2O5 reacts with both the Lewis acidic (Al2Cl7-) and the Lewis neutral species (AlCl4-) within the electrolyte. The reaction products are identified using a combination of electrochemical analyses, Raman spectroscopy, liquid-state and solid-state nuclear magnetic resonance (NMR) spectroscopy, and density functional theory (DFT) calculations. The results establish that V2O5 chemically reacts with Al2Cl7- to form vanadium oxychloride (VOCl3) and amorphous aluminum oxide. V2O5 also chemically reacts with AlCl4- to produce dioxovanadium chloride (VO2Cl) and a new species of metavanadate anion coordinated with aluminum chloride (AlCl3VO3-). These products furthermore exhibit electrochemical redox activity between V5+ and V2+ oxidation states. Our results have significant implications when interpreting the electrochemical properties and mechanisms of rechargeable Al-V2O5 batteries.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2019. Vol. 31, no 18, p. 7238-7247
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Materials Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-395841DOI: 10.1021/acs.chemmater.9b01556ISI: 000487859200016OAI: oai:DiVA.org:uu-395841DiVA, id: diva2:1365543
Funder
Swedish Research Council, 2017-05447Swedish Research Council, 2016-05366Swedish National Infrastructure for Computing (SNIC), SNIC 2018/2-51Available from: 2019-10-25 Created: 2019-10-25 Last updated: 2019-10-25Bibliographically approved

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