NDLI: Direct Investigation of Mg Intercalation into the Orthorhombic V2O5 Cathode Using Atomic-Resolution Transmission Electron Microscopy [Direct Investigation of Mg intercalation into orthorhombic V2O5 cathode using Atomic Resolution Electron Microscopy Methods]

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Direct Investigation of Mg Intercalation into the Orthorhombic V₂O₅ Cathode Using Atomic-Resolution Transmission Electron Microscopy [Direct Investigation of Mg intercalation into orthorhombic V₂O₅ cathode using Atomic Resolution Electron Microscopy Methods]

Content Provider	United States Department of Energy Office of Scientific and Technical Information (OSTI.GOV)
Author	Mukherjee, Arijita Sa, Niya Phillips, Patrick J. Burrell, Anthony Vaughey, John Klie, Robert F.
Organization	Argonne National Lab. (ANL), Argonne, IL (United States)
Abstract	Batteries based on Mg metal anode can promise much higher specific volumetric capacity and energy density compared to Li-ion systems and are, at the same time, safer and more cost-effective. While previous experimental reports have claimed reversible Mg intercalation into beyond Chevrel phase cathodes, they provide limited evidence of true Mg intercalation other than electrochemical data. Transmission electron microscopy techniques provide unique capabilities to directly image Mg intercalation and quantify the redox reaction within the cathode material. Here, we present a systematic study of Mg insertion into orthorhombic V₂O₅, combining aberration-corrected scanning transmission electron microscopy (STEM) imaging, electron energy-loss spectroscopy (EELS), and energy-dispersive X-ray spectroscopy (EDX) analysis. We compare the results from an electrochemically cycled V₂O₅ cathode in a prospective full cell with Mg metal anode with a chemically synthesized MgV₂O₅ sample. Results suggest that the electrochemically cycled orthorhombic V₂O₅ cathode shows a local formation of the theoretically predicted ϵ-Mg_0.5V₂O₅ phase; however, the intercalation levels of Mg are lower than predicted. Lastly, this phase is different from the chemically synthesized sample, which is found to represent the δ-MgV₂O₅ phase.
Sponsorship	USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Related Links	https://www.osti.gov/biblio/1417894
Starting Page	2218
Ending Page	2226
Page Count	9
File Format	PDF
ISSN	08974756
DOI	10.1021/acs.chemmater.6b05089
Journal	Chemistry of Materials
Volume Number	29
Issue Number	5
Language	English
Publisher	American Chemical Society (ACS)
Publisher Date	2017-02-13
Publisher Place	United States
Access Restriction	Open
Subject Keyword	MATERIALS SCIENCE magnesium cathode microscopy
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry Chemical Engineering

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