The sign of the [Negative electrode surface potential difference]

[LYL534]

The sign of the [Negative electrode surface potential difference], when the battery is charging. I set the charge current to positive. If there is no li_plating, what's sign of the [Negative electrode surface potential difference]
And what if I set the charge current as negative and the capacity as negative. Does the [Negative electrode surface potential difference] sign change.
I mean if the charge current is positive, what's the sign of overpotential when there is no li_plating?
If the charge current is negative and the capacity is negative, what's the sign of the overpotential when there is no li_plating?