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Estimation of Battery Separator Area, Cell Thickness and Diffusion Coefficient Based on Non-Ideal Liquid-Phase Diffusion Modeling

Author

Listed:
  • Bence Csomós

    (Research and Development Center of Technical Sciences, University of Pannonia, 8200 Veszprém, Hungary)

  • Dénes Fodor

    (Research and Development Center of Technical Sciences, University of Pannonia, 8200 Veszprém, Hungary)

  • István Vajda

    (Institute of Automation, Óbuda University, 1034 Budapest, Hungary)

Abstract

The aim of this work is to present a fast and in situ diffusion modeling technique to extract essential electrochemical parameters from liquid-phase diffusion which can be used to implement a realistic battery in a pseudo-2D finite element modeling environment. A generalized Warburg element was used within an extended Randles equivalent circuit to obtain an appropriate fit on non-ideal diffusion impedance. Based on the calculation method presented in this paper, the values of diffusion-related parameters such as the cross-sectional area of the separator A sep , cell thickness L cell as well as liquid-phase and solid-phase diffusion coefficients D l and D s were derived, successfully. A characteristic cell which allowed the exchange current density i 0 and reaction rate constant k 0 to be calculated was also established. The experimental data was measured by electrochemical impedance spectroscopy (EIS), resistivity measurement and the galvanostatic intermittent titration technique (GITT). The results show that our hypothesis to extract essential electrochemical parameters from the tail part of diffusion impedance is correct. The applicability of our concept is confirmed by the prosperous validation results produced by computed tomography (CT) and battery dynamics simulation in finite-element environment. Due to the inherent limitations of the pseudo-2D Doyle-Fuller-Newman (DFN) model, our technique is accordingly valid within the current range of 0–1 C.

Suggested Citation

  • Bence Csomós & Dénes Fodor & István Vajda, 2020. "Estimation of Battery Separator Area, Cell Thickness and Diffusion Coefficient Based on Non-Ideal Liquid-Phase Diffusion Modeling," Energies, MDPI, vol. 13(23), pages 1-23, November.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:23:p:6238-:d:451838
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    References listed on IDEAS

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    1. Rujian Fu & Xuan Zhou & Hengbin Fan & Douglas Blaisdell & Ajay Jagadale & Xi Zhang & Rui Xiong, 2017. "Comparison of Lithium-Ion Anode Materials Using an Experimentally Verified Physics-Based Electrochemical Model," Energies, MDPI, vol. 10(12), pages 1-20, December.
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    3. Victor Pizarro-Carmona & Marcelo Cortés-Carmona & Rodrigo Palma-Behnke & Williams Calderón-Muñoz & Marcos E. Orchard & Pablo A. Estévez, 2019. "An Optimized Impedance Model for the Estimation of the State-of-Charge of a Li-Ion Cell: The Case of a LiFePO 4 (ANR26650)," Energies, MDPI, vol. 12(4), pages 1-16, February.
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