half cell simulation of Graphite electrode

[Thiyaga2025]

hi all,

I am trying to understand the half cell simulation of graphite electrode from https://docs.pybamm.org/en/stable/source/examples/notebooks/models/half-cell.html, from Chen at al work, the lithiation curve is established as given by OKane et al.

the example problem shows that during charging the graphite electrode(+ve elctrode in half cell simulation) is getting delthiated(Voltage increases) and during discharge it gets lithiated(OCP decreases). But my understanding of Chen paper is that OCP decreases during charging and increases during discharging process. please clarify me here. thanks for your time.