Nanosecond MD of battery cathode materials with electron density description

Paolo Vincenzo Freiesleben de Blasio, Peter Bjørn Jorgensen, Juan Maria Garcia Lastra, Arghya Bhowmik*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

Potentials derived with machine learning algorithms achieve the accuracy of high-fidelity quantum mechanical computations such as density functional theory (DFT), while allowing orders of magnitude lower computational time. In this work, we demonstrate the use of uncertainty aware equivariant graph neural networks for predicting spin-resolved electron densities, forces, and energies of the Na3V2(PO4)3 NASICON structured cathode. Due to the speedup in computational time, we are able to investigate structures of ∼300 atoms for 200 million timesteps. The ability to model larger systems on the nanosecond length scale with maintaining DFT level accuracy allowed critical insights into the diffusion characteristics of Na-ions, associated electron transfer processes, and dependence of diffusivity on sodium concentration in the structure.
Original languageEnglish
Article number103023
JournalEnergy Storage Materials
Volume63
Number of pages13
ISSN2405-8297
DOIs
Publication statusPublished - 2023

Keywords

  • Machine learning
  • Graph neural network
  • Charge density prediction
  • Intercalation cathode
  • Ionic diffusion

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