Particle radius from microstructure data using total volume and total surface area

[amirDahari1]

Hello,

I am parameterising a DFN model in PyBaMM using microstructure data. From the segmented image I can compute the positive electrode active material volume fraction ($\epsilon_s = V_{AM} / V_{electrode}$) and the active material–electrolyte interfacial area per electrode volume ($a = A_{AM|pore} / V_{electrode}$). In the PyBaMM code the specific surface area is computed assuming spherical particles as $a = 3 * \epsilon_s / R_{typ}$, where $R_{typ}$ corresponds to "Positive particle radius [m]". To make the DFN surface area consistent with the measured microstructure, is the correct approach to set "Positive particle radius [m]" to $R_{typ} = 3 * \epsilon_s / a$ (equivalently $R_{typ} = 3 * V_{AM} / A_{AM|pore})$?

[github-actions[bot]]

Hi! We have now moved our discussions to Discourse. Please post your question there.