The heterogeneous microstructure of lithium ion batteries (LIBs) remarkably influences performance by providing certain interfacial surface area, diffusion path, and active material connectivity. In this work, the LiFePO4 (LFP) electrode microstructure of a LIB is reconstructed based on the nanoXCT images in Simpleware software. The 3D model was then meshed and exported to COMSOL Multiphysics® for Finite Element Analysis (FEA). The results show that the electrode heterogeneity causes a wider range of physical and electrochemical properties compared to common homogenous models.
This study was financially supported by the University of Akron and the Natural Sciences and Engineering Research Council of Canada (NSERC) through grants to Z.C. and the University of Waterloo.
A.G. Kashkooli, et al., 2016. Multi-scale modeling of lithium-ion battery electrodes based on nanoscale X-ray computed tomography, J Power Sources.
Reconstructed nanoXCT image data in Simpleware ScanIP
Simulation-ready volume mesh generated in Simpleware FE and exported directly to COMSOL Multiphysics®