Enhanced 3D electrochemical-electromagnetic model of cylindrical Li-ion batteries for higher fidelity modelling of high-frequency impedance spectra

Di Prima, Piera (author), Mele, Igor (author), Bodoardo, Silvia (author), Santarelli, Massimo (author), Katrašnik, Tomaž (author), Amici, Julia (author)

This study presents a modelling framework for fully coupled modelling of electrochemical-electromagnetic phenomena in 3D with a focus on higher frequency intra-cell phenomena. The model integrates a porous electrode theory based electrochemical model with the Maxwell–Ampère law model and innovatively considers the full 3D geometry of the cell with an aim to more accurately represent its internal structure. It is shown in the paper that full coupling of electrochemical and electromagnetic phenomena on the same 3D computational mesh makes possible higher fidelity simulations of high-frequency inductive effects in realistic cell geometries. The properties and capabilities of the model are demonstrated on the cylindrical 21 700 Li-ion cell. The results clearly show that the 3D geometry of the jellyroll structure of the cylindrical cell with its spiral arrangement of electrodes and current collectors significantly influences the distribution of currents and thus the inductive response at high frequencies. These improved predictive capabilities of the model, especially in the description of high-frequency impedance phenomena, enable a deeper understanding of how design features influence the electrochemical impedance spectroscopy (EIS) response of the battery and open new perspectives for the model-based deciphering of EIS spectra of cells with pronounced high-frequency inductive effects.

• Language: English
• Keywords: modelling, Li-ion battery cell, electrochemical impedance spectroscopy, inductive effects, electrochemical model, COMSOL
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2026
• Number of pages: Str. [1-10]
• Numbering: Vol. 173, no. 16, art. 160502
• PID: 20.500.12556/RUL-185643
• UDC: 621.352:004.925.8
• ISSN on article: 1945-7111
• DOI: 10.1149/1945-7111/ae94f5
• COBISS.SI-ID: 287831299
• Publication date in RUL: 14.08.2026

Record is a part of a journal

• Title: Journal of the electrochemical society
• Publisher: Electrochemical Society
• ISSN: 1945-7111
• COBISS.SI-ID: 22698791

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

• Language: Slovenian
• Keywords: modeliranje, Li-ionska baterijska celica, elektrokemijska impedančna spektroskopija, induktivni efekti, elektrokemijski model, COMSOL

Projects

• Funder: EC - European Commission
• Project number: 101069743
• Name: Development of ADVAnced next GENeration Solid-State batteries for Electromobility Applications
• Acronym: ADVAGEN

• Funder: ARIS - Slovenian Research and Innovation Agency
• Project number: P2-0401-2022
• Name: Energetsko strojništvo