A Physically-Based Equivalent Circuit Model for the Impedance of a LiFePO4/Graphite 26650 Cylindrical Cell
Roberto Scipioni,Peter Stanley Jørgensen,Christopher R. Graves,Johan Hjelm,Søren Højgaard Jensen +4 more
TL;DR: In this article, an equivalent circuit model is developed and used to model impedance spectra measured on a commercial 26650 LiFePO4/Graphite cylindrical cell, which is based on measurements and modeling of impedance spectras recorded separately on cathode and anode (Graphite) samples, harvested from the commercial cell.
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Abstract: In this work an Equivalent Circuit Model (ECM) is developed and used to model impedance spectra measured on a commercial 26650 LiFePO4/Graphite cylindrical cell. The ECM is based on measurements and modeling of impedance spectra recorded separately on cathode (LiFePO4) and anode (Graphite) samples, harvested from the commercial cell. Modeling of the single-electrode impedance spectra provided information about the electronic and ionic resistance in the porous composite electrodes, as well as the solid state diffusion. Focused Ion Beam (FIB)/Scanning Electron Microscopy (SEM) of anode and cathode samples was used to make 3-D maps of the electrode microstructures and to obtain microstructural data for the ECM. The complementary analysis was crucial for the resolution of the single electrode impedance parameters and the proposal and validation of a new equivalent circuit used to model the full commercial battery impedance.
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Citations
Application of electrochemical impedance spectroscopy to commercial Li-ion cells: a review
Nina Meddings,Marco Heinrich,Frederic Overney,Jong-Sook Lee,Vanesa Ruiz,Emilio Napolitano,Steffen Seitz,Gareth Hinds,Rinaldo Raccichini,Miran Gaberšček,Juyeon Park +10 more
TL;DR: In this article, a focus review summarising best metrological practice in the application of EIS to commercial Li-ion cells is presented, highlighting the benefits and drawbacks of the technique.
568
Bridging physics-based and equivalent circuit models for lithium-ion batteries
TL;DR: In this article, an implementation of a widely used pseudo-two-dimensional (P2D) model for lithium-ion battery simulation is presented with a transmission line circuit structure.
71
Transmission line models for evaluation of impedance response of insertion battery electrodes and cells
Jože Moškon,Miran Gaberšček +1 more
- 01 Feb 2021
TL;DR: In this article, the theoretical development and application of physics-based transmission line models (TLM) schemes in porous battery electrodes and other porous battery components are discussed. But the authors focus on the theoretical evaluation of the proposed TLM and their ability to simulate the measured impedance spectra.
70
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