The Insulation boundary condition describes the walls of a cell or the boundaries of the cell that do not face a conductor. The boundary condition imposes the following equation:

where ik denotes the current density vector and k = l, s is an index for the electrolyte and electrode, respectively.

The node can be added as a subnode to either Electrolyte Phase or Electronic Conducting Phase. This node is unavailable in Electrolyte Phase if Solve for electrolyte phase potential is cleared in the interface top node.