Image based modelling of microstructural heterogeneity in LiFePO4 electrodes for Li-ion batteries

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.

• Publication year

  2014

• Venue

  Journal of Power Sources

• Publication date

  2014-02-01

• Fields of study

  Materials Science, Chemistry, Engineering

• Identifiers
  DOI 10.1016/J.JPOWSOUR.2013.04.156
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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