Separation of the charge transfers and solid electrolyte interphase contributions to a battery voltage by modeling their non-linearities regarding current and temperature

Aging Determination of Lithium Ion Batteries Based on Thermal Measurements

“…LIBs can be modeled by an equivalent electrical circuit model (Fig. 1.a) where each component of the model corresponds to different electrochemical phenomena [18] : a voltage source 𝑈 𝑂𝐶 defined as the battery voltage in open circuit (OCV), a series resistance 𝑅 𝑠 representing the pure resistive contributions (electrolyte, current collectors, contact resistances), a surface resistance 𝑅 𝑠𝑢𝑟𝑓 corresponding to the potential drop between the surface of active materials and the electrolyte (due to the charge transfer 𝑅 𝑐𝑡 and to the SEI "Solid Electrolyte Interphase"), a capacity 𝐶 𝑠𝑢𝑟𝑓 representing the capacitif effect of charge transfer and SEI, a diffusion impedance 𝑍 𝑤 that encompasses impedances due to charge diffusion in the electrolyte and lithium atoms diffusion in the active material of both electrodes. Those phenomena described earlier are represented by battery impedance characteristic curve (Nyquist diagram) where each point is an impedance measurement at a different frequency (Fig.…”

Modeling the Non-linearities of Charge-Transfers and Solid Electrolyte Interphase Resistances for a Sodium-Ion Battery with a Hard Carbon Electrode

“…Therefore, Arrhenius law was included in eq(4) in order to model I 0 and R SEI as function of temperature. Hence, eq (6) determines the surface resistance as a function of current and temperature [8]. The first term of eq (6) represents the SEI resistance and the second term represents the charge transfers resistance.…”

“…These pulse tests were done at different current regimes for 20 seconds. The 20 seconds pulse duration was chosen so that the diffusion process was well fitted without having a deformation of the voltage which is the response of the current pulse [8]. Fig.…”

“…Damay et al [8] proposed a model of the so-called "surface resistance" of LiFePO 4 /graphite cell. This resistance is linked to the voltage drop due to charge transfers and the contribution of solid electrolyte interphase "SEI".…”

Reduced Model for Fast Simulation of a Lithium-Ion Battery Pack Taking Into Account Current and State of Charge Dispersion

“…The electrical behavior of the pack depends on the electrical behavior of the cells that constitute it, so the starting point for modeling the pack is modeling the cells. For that, we chose an equivalent electrical circuit model [8] (see the cell zoom in Fig. 3), composed of: R dif f : a diusion resistance related to the phenomena of lithium ions diusion in the electrolyte and lithium atoms in both electrodes; All these parameters are obtained from previously determined look-up tables as a function of temperature, SOC and current.…”