The discrepancy of Li Plating Overpotential Definition between code and paper

[Yuxiao-Lan]

Hello PyBAMM!

I am looking to understand how the Li plating happend and review the source code of plating.py in the lithium_plating folder. Upon reviewing the get_coupled_variables function, I noticed that the overpotential for Li stripping is defined as the sum of the electrode surface potential difference and the electrode SEI film overpotential (eta_stripping = delta_phi + eta_sei). This definition appears to differ from the one provided in Okane’s paper (Okane 2022), where the overpotential for Li plating is expressed as $\eta_{Li}=\phi_{s}-\phi_{e}-\eta_{SEI}$, implying that it is the difference between the electrode surface potential difference and the electrode SEI film overpotential.

Although I have read the discussion eta_stripping / eta_plating #2031, it does not appear to address the sign discrepancies in the equations. The discrepancy between the definition in the code and paper is still confusing to me.

Any insights or assistance would be greatly appreciated!

[Yuxiao-Lan]

Resolved in eta_stripping / eta_plating #2031