Quantifying Cell-to-Cell Variations in Lithium Ion Batteries

Table 1

List of nominal parameters used in the impedance model.

Parameter	Cathode	Separator	Anode
Diffusion coefficient in the solid particles (m^2/s)	1𝑒-12	—	3.7125𝑒-14
Solid phase conductivity (S/m)	10		100
Nominal porosity	0.3	0.45	0.4382
Filler fraction	0.15		0.0566
Transfer coefficient	0.5		0.5
Nominal particle size (μm)	8.5		12.5
Equilibrium exchange current density (A/m^2)	10		10
Double layer capacitance for the electrode (F/m^2)	0.2		0.2
Double layer capacitance for the surface film (F/m^2)	0.02		0.02
Resistance for the surface film (Ohm-m^2)	1𝑒-4		5𝑒-4
Tortuosity	2.3	1.5	4.1
Nominal electrode thickness (μm)	70	25	73.5
Stoichiometric window	0.99–0.52		0.7952–0.01
Initial concentration of the electrolyte (M)		1
Conductivity of the electrolyte (S/m)		10
Diffusivity in the electrolyte (m^2/s)		2.58𝑒-10
Transport number		0.435
Nominal room temperature		298 K