Theoretical and Computational Chemistry

Electrostatic estimation of intercalant jump-diffusion barriers using finite-size ion models

Authors

Abstract

We report on a scheme for estimating intercalant jump-diffusion barriers that are typically obtained from demanding density functional theory-nudged elastic band calculations. The key idea is to relax a chain of states in the field of the electrostatic potential that is averaged over a spherical volume using different finite-size ion models. For magnesium migrating in typical intercalation materials such as transition-metal oxides, we find that the optimal model is a relatively large shell. This data-driven result parallels typical assumptions made in models based on Onsager’s reaction field theory to quantitatively estimating electrostatic solvent effects. Because of its efficiency, our potential of electrostatics-finite ion size (PfEFIS) barrier estimation scheme will enable rapid identification of materials with good ionic mobility.

Content

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Supplementary material

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predicting NEB barriers SI
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predicting NEB barriers SI movie