Lithium-Ion Battery
The geometry has now been defined, and we have imported the needed parameters. We are now ready to start defining the actual physics of the problem.
The Separator node was added to the interface by default.
Add and Define the Negative Electrode
Keep the default settings for the Separator, and proceed to add and set up the physics in the porous electrodes and current collectors.
1
In the Physics toolbar, click  Domains and choose Porous Electrode.
2
In the Settings window for Porous Electrode, type Porous Electrode - Negative in the Label text field.
3
Locate the Domain Selection section. From the Selection list, choose Negative Electrode.
4
Locate the Electrolyte Properties section. From the Electrolyte material list, choose LiPF6 in 3:7 EC:EMC (Liquid, Li-ion Battery) .
5
Locate the Electrode Properties section. In the σs text field, type sigmas_neg.
6
Locate the Porous Matrix Properties section. In the εs text field, type epss_neg.
7
In the εl text field, type 1-epss_neg.
Particle Intercalation 1
1
In the Model Builder window, click Particle Intercalation 1.
2
In the Settings window for Particle Intercalation, locate the Particle Transport Properties section.
3
In the rp text field, type rp_neg.
Leave the settings of the Species Settings section as is for now. The initial species concentration setting will be made inactive later when we define the cell state of charge on a different node.
Porous Electrode Reaction 1
1
In the Model Builder window, click Porous Electrode Reaction 1.
2
In the Settings window for Porous Electrode Reaction, locate the Electrode Kinetics section.
3
In the i0,ref(T) text field, type i0ref_neg.
Add and Define the Positive Electrode
Proceed similarly to define the positive electrode.
1
In the Physics toolbar, click  Domains and choose Porous Electrode and rename the node by typing Porous Electrode - Positive in the Label text field.
2
Locate the Domain Selection section. From the Selection list, choose Positive Electrode.
3
Locate the Electrolyte Properties section. From the Electrolyte material list, choose LiPF6 in 3:7 EC:EMC (Liquid, Li-ion Battery.
4
Locate the Electrode Properties section. In the σs text field, type sigmas_pos.
5
Locate the Porous Matrix Properties section. In the εs text field, type epss_pos.
6
In the εl text field, type 1-epss_pos.
Particle Intercalation 1
1
Click Particle Intercalation 1 child node and in the Particle Transport Properties section, in the rp text field, type rp_pos.
Porous Electrode Reaction 1
1
Click Porous Electrode Reaction 1 and in the Electrode Kinetics section, type i0ref_pos.
Current Conductor 1
1
In the Physics toolbar, click  Domains and choose Current Conductor.
2
In the Settings window for Current Conductor, locate the Domain Selection section.
3
From the Selection list, choose Metal Foil Domains.
Electric Ground 1
1
In the Physics toolbar, click  Boundaries and choose Electric Ground.
2
In the Settings window for Electric Ground, locate the Boundary Selection section.
3
From the Selection list, choose Negative Tab End.
Enable SOC and Initial Charge Distribution
1
Enable the Define cell state of charge (SOC) and initial charge inventory on the Lithium-Ion Battery interface top node. This will allow us to set the initial SOC of the battery cell.
Then set the initial state of charge of the cell as follows:
2
In the Model Builder window, click SOC and Initial Charge Distribution 1.
3
In the Settings window for SOC and Initial Charge Distribution, locate the Initial Cell Charge Distribution section.
4
In the SOC0 text field, type SOC_start.
Set the Electrode Domain Selections
1
In the Model Builder window, click Negative Electrode Domain Selection 1.
2
In the Settings window for Negative Electrode Domain Selection, locate the Domain Selection section. From the Selection list, choose Negative Electrode.
Proceed similarly for the positive selection:
3
Click Positive Electrode Domain Selection 1, choose Positive Electrode.
Electrode Current 1
Enabling the SOC and Initial Charge Distribution node means that the capacity of the cell can be defined. Add the final current boundary condition current based on a C-rate multiple as follows:
1
In the Physics toolbar, click  Boundaries and choose Electrode Current.
2
In the Settings window for Electrode Current, locate the Boundary Selection section.
3
From the Selection list, choose Positive Tab End.
4
Locate the Electrode Current section. From the list, choose C-rate multiple.
5
In the Crate text field, type C_rate.