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Interstitial vs. Substitutional Metal Insertion in V2O5 as Post-Lithium Ion Battery Cathode: A Comparative GGA/GGA+U Study with Localized Bases

preprint
submitted on 25.03.2020 and posted on 25.03.2020 by Daniel Koch, Sergei Manzhos

The generalized gradient approximation (GGA) often fails to correctly describe the electronic structure and thermochemistry of transition metal oxides and is commonly improved using an inexpensive correction term with a scaling parameter U. We tune U to reproduce experimental vanadium oxide redox energetics with a localized basis and a GGA functional. We find the value for U to be significantly lower than what is generally reported with plane-wave bases, with the uncorrected GGA results being in reasonable agreement with experiments. We use this computational setup to calculate interstitial and substitutional insertion energies of main group metals in vanadium pentoxide and find interstitial doping to be thermodynamically favored.

Funding

This work was in part supported by the Ministry of Education of Singapore (Grant No. MOE2015-T2-1-011).

History

Email Address of Submitting Author

koch.danielm@gmail.com

Institution

National University of Singapore

Country

Singapore

ORCID For Submitting Author

0000-0003-4775-6879

Declaration of Conflict of Interest

There are no conflicts to declare.

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