Fig. 6: Illustration of a numerically generated 3D microstructure having two adjacent layers with two different porosities. | npj Computational Materials

Fig. 6: Illustration of a numerically generated 3D microstructure having two adjacent layers with two different porosities.

From: The electrode tortuosity factor: why the conventional tortuosity factor is not well suited for quantifying transport in porous Li-ion battery electrodes and what to use instead

Fig. 6

90% of volume has ε = 35%, while 10% (cyan box) of volume has ε = 20%. a The plot shows the simulated EIS of eSCM along with the fit using Eq. 4. The plot contains an inset showing the cross-section of the two microstructures, that have either the lower porosity region at the current collector side (blue square) or at the separator side (red square), in symmetric cell configuration with the associated electrode tortuosity factor \(\uptau_{\mathrm{e}}\); b The 3D microstructure that has lower porosity at the top is shown in detail along with the associated tortuosity factor \(\uptau\) given by eRDM simulation. The simulated flux density shows a lower density on the top corresponding with the lower porosity region. The pore network separated in through-pores and dead-end pores is also presented. The microstructure size is 50 × 50 × 50 voxels, the voxel size equals to 1 µm.

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