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Transport in Porous Media

, Volume 120, Issue 1, pp 141–165 | Cite as

Prediction of Effective Properties of Porous Carbon Electrodes from a Parametric 3D Random Morphological Model

  • Torben Prill
  • Dominique Jeulin
  • François Willot
  • Juan Balach
  • Flavio Soldera
Article
  • 125 Downloads

Abstract

Pore structures have a major impact on the transport and electrical properties of electrochemical devices, such as batteries and electric double-layer capacitors (EDLCs). In this work we are concerned with the prediction of the electrical conductivity, ion diffusivity and volumetric capacitance of EDLC electrodes, manufactured from hierarchically porous carbons. To investigate the dependence of the effective properties on the pore structures, we use a structurally resolved parametric model of a random medium. Our approach starts from 3D FIB-SEM imaging, combined with automatic segmentation. Then, a random set model is fitted to the segmented structures and the effective transport properties are predicted using full field simulations by iterations of FFT on 3D pore space images and calculations based on the geometric properties of the structure model. A parameter study of the model is used to investigate the sensitivity of the effective conductivity and diffusivity to changes in the model parameters. Finally, we investigate the volumetric capacitance of the EDLC electrodes with a geometric model, make a comparison with experimental measurements and do a parameter study to suggest improved microstructures.

Keywords

Porous electrodes Double-layer capacitor FIB-SEM nanotomography Stochastic modeling 

Notes

Acknowledgements

This work was partly funded by the German Federal Ministry of Education and Research, Project AMiNa (03MS603D).

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Copyright information

© Springer Science+Business Media B.V. 2017

Authors and Affiliations

  1. 1.Fraunhofer ITWMKaiserslauternGermany
  2. 2.Center for Mathematical Morphology, MINES ParistechPSL Research UniversityFontainebleauFrance
  3. 3.Department of ChemistryUniversidad Nacional de Río Cuarto-CONICETRío CuartoArgentina
  4. 4.Department of Materials Science and EngineeringSaarland UniversitySaarbrückenGermany

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