Use the Negative Porous Electrode node to set up current balances for the electrode and the pore electrolyte in the lead electrode, a material balance for the salt, and a mass balance for lead, lead oxide, and lead sulfate, using the porosity variable. In addition, the feature is also able to define the charge transfer reactions that take place in the lead electrode.

By addition of Porous Electrode Reaction subnodes, the feature is also able to define the charge transfer reactions that take place at the interface between the pore electrolyte and the porous electrode matrix. A Porous Matrix Double Layer Capacitance and a Porous Matrix Adsorption/Desorption Reaction (for the Battery with Binary Electrolyte interface), can also be added to the node.

See the Reservoir node for the settings of this section.

The Porosity at zero charge ε0 and Porosity when fully charged εmax determines the capacity of the electrode and defines the soc variable. The Exponent on porosity in electrode exm defines how the effective transport parameters in the porous media depends on the porosity.

See the Electrode for more information about the settings of this node.