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.
Original language | English |
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Journal | Journal of The Electrochemical Society |
Volume | 164 |
Issue number | 9 |
Pages (from-to) | A2017-A2030 |
ISSN | 0013-4651 |
DOIs | |
Publication status | Published - 2017 |