Quantitative Relationships Between Pore Tortuosity, Pore Topology, and Solid Particle Morphology Using a Novel Discrete Particle Size Algorithm

Francois Usseglio-Viretta, Donal Finegan, Andrew Colclasure, Thomas Heenan, Daniel Abraham, Paul Shearing, Kandler Smith

Research output: Contribution to journalArticlepeer-review

39 Scopus Citations

Abstract

To sustain the continuous high-rate charge current required for fast charging of electric vehicle batteries, the ionic effective diffusion coefficient of the electrodes must be high enough to avoid the electrode being transport limited. Tortuosity factor and porosity are the two microstructure parameters that control this effective diffusion coefficient. While different methods exist to experimentally measure or calculate the tortuosity factor, no generic relationship between tortuosity and microstructure presently exists that is applicable across a large variety of electrode microstructures and porosities. Indeed, most relationships are microstructure specific. In this work, generic relationships are established using only geometrically defined metrics that can thus be used to design thick electrodes suitable for fast charging. To achieve this objective, an original, discrete particle-size algorithm is introduced and used to identify and segment particles across a set of 19 various electrode microstructures (nickel-manganese-cobalt [NMC] and graphite) obtained from X-ray computed tomography (CT) to quantify parameters such as porosity, particle elongation, sinuosity, and constriction, which influence the effective diffusion coefficient. Compared to the widely used watershed method, the new algorithm shows less over-segmentation. Particle size obtained with different numerical methods is also compared. Lastly, microstructure-Tortuosity relationship and particle size and morphology analysis methods are reviewed.

Original languageAmerican English
Article number100513
Number of pages32
JournalJournal of the Electrochemical Society
Volume167
Issue number10
DOIs
StatePublished - 2020

Bibliographical note

Publisher Copyright:
© 2020 The Author(s). Published on behalf of The Electrochemical Society by IOP Publishing Limited.

NREL Publication Number

  • NREL/JA-5400-75813

Keywords

  • discrete particle size algorithm
  • electrode tortuosity factor
  • graphite
  • Li-ion battery
  • nickel-cobalt-manganese
  • particle identification
  • pore network

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