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Publication Detail
Image based modelling of microstructural heterogeneity in LiFePO 4 electrodes for Li-ion batteries
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Journal Article
  • Authors:
    Cooper SJ, Eastwood DS, Gelb J, Damblanc G, Brett DJL, Bradley RS, Withers PJ, Lee PD, Marquis AJ, Brandon NP, Shearing PR
  • Publication date:
    2014
  • Pagination:
    1033, 1039
  • Journal:
    Journal of Power Sources
  • Volume:
    247
  • Print ISSN:
    0378-7753
  • PII:
    S0378775313007763
  • Language:
    eng
  • Keywords:
    Imaged based modelling, Li-ion battery, Lithium iron phosphate, Tortuosity, X-ray tomography
Abstract
Battery and fuel cell simulations commonly assume that electrodes are macro-homogeneous and isotropic. These simulations have been used to successfully model performance, but give little insight into predicting failure. In Li-ion battery electrodes, it is understood that local tortuosity impacts charging rates, which may cause increased degradation. This report describes a novel approach to quantifying tortuosity based on a heat transfer analogy applied to X-ray microscopy data of a commercially available LiFePO4 electrode. This combination of X-ray imaging and image-based simulation reveals the microscopic performance of the electrode; notably, the tortuosity was observed to vary significantly depending on the direction considered, which suggests that tortuosity might best be quantified using vectors rather than scalars. © 2013 The Authors. Published by Elsevier B.V. All rights reserved.
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Dept of Chemical Engineering
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Dept of Chemical Engineering
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