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Mechanical Characterization and Modeling of Large-Format Lithium-Ion Battery Cell Electrodes and Separators

We investigated porous graphite and NCA electrodes as well as PE separators with respect to their stress-strain response. Using more than one mechanical (de)compression cycle, we highlighted a significant dependency of the stress-strain behavior on the testing procedure. Additionally, the materials tend to be stiffer with increasing nominal stress (applied force).

Utilizing a poroelastic mechanical model, we successfully predicted the non-linear behavior of these materials with high accuracy, achieving a normalized root-mean-squared error of less than 5.5%.

Read the full open-access article here: https://www.mdpi.com/2313-0105/10/12/422