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Communication Dans Un Congrès Année : 2018

Modeling of the Electrochemical Impedance Spectroscopy of a Porous Electrode Composed of Micro-sized Particles Embedded by a Nano Layer

David Gruet
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Bruno Delobel
  • Fonction : Auteur
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Résumé

Electrochemical impedance spectroscopy (EIS) is a powerful technique for characterizing an electrochemical system and is widely used in the battery field. The comprehensive interpretation of EIS spectra obtained on Li-ion batteries can however be tedious because these systems are composed of porous electrodes and a complex electrolyte. Moreover side reactions, such as the formation of an insulating layer around the particles of the porous electrodes can occur during the battery operation, thus modifying the impedance response. Additionally, it is often difficult to measure the impedance of a half-cell during battery cycle-life, and the resulting EIS response consists in the impedance of the whole battery measured without reference electrode. A way to improve the interpretation of impedance data of Li-ion systems is to use modeling. Most of the time, the modeling of EIS is limited to the use of electrical equivalent circuits (EEC) but the link between EEC and the physical processes accounting for the system is hard to establish. However, in the 60s, Newman et al. [1] developed a model for porous battery electrodes. Their model describes the whole battery system with equations that are directly related to the physical phenomena occurring in the composite electrodes. This model is still widely used in the battery field to simulate galvanostatic charge and discharge. Based on their work, and inspiring by works already done on the modeling of EIS [2], it is possible to devise a model for electrochemical impedance spectroscopy by linearizing all the equations [3]. The model obtained will then be directly connected to the physical phenomena occurring inside the porous electrodes which will greatly help to interpret impedance spectra. In our work, we developed an analytical solution of EIS for a porous electrode composed of particles with insertion reactions considering the kinetics of the electron transfer reactions, the diffusion processes in both solid and liquid phases. We then studied the influence of an insulating film forming around the particles on the EIS spectra. The model presented here allows not only to predict the impedance of a porous electrode depending on its state of charge but it is also valid for the whole intercalation rate with the same set of parameters. References (1) Newman, J.S.; Tobias, C.W. Journal of the Electrochemical Society 1962, 109(12), page 1183-1191. (2) Meyers, J.P. et al. ; Journal of the Electrochemical Society 2000, 147(8), page 2930- 2940. (3) Huang, J.; Zhang, J.B. Journal of the Electrochemical Society 2016, 163(9), page A1983-A2000.
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Dates et versions

hal-03976752 , version 1 (07-02-2023)

Identifiants

  • HAL Id : hal-03976752 , version 1

Citer

David Gruet, David Sicsic, Ivan T. Lucas, Bruno Delobel, Vincent Vivier. Modeling of the Electrochemical Impedance Spectroscopy of a Porous Electrode Composed of Micro-sized Particles Embedded by a Nano Layer. ElecNano 8, Société Chimique de France (SCF), May 2018, Nancy, France. ⟨hal-03976752⟩
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