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]
- Univ. of Illinois at Chicago, Chicago, IL (United States); Argonne National Lab. (ANL), Lemont, IL (United States)
- Argonne National Lab. (ANL), Lemont, IL (United States)
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-Mg0.5V2O5 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.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1417894
- Journal Information:
- Chemistry of Materials, Vol. 29, Issue 5; ISSN 0897-4756
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Phase stability of intercalated V 2 O 5 battery cathodes elucidated through the Goldschmidt tolerance factor
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journal | January 2019 |
On the Balance of Intercalation and Conversion Reactions in Battery Cathodes
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journal | April 2018 |
Mo-doped V2O5 hierarchical nanorod/nanoparticle core/shell porous microspheres with improved performance for cathode of lithium-ion battery
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journal | May 2018 |
Recent Progress on Layered Cathode Materials for Nonaqueous Rechargeable Magnesium Batteries | journal | October 2019 |
On the Balance of Intercalation and Conversion Reactions in Battery Cathodes | text | January 2018 |
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