A Multiphysics-Multiscale Model for Particle–Binder Interactions in Electrode of Lithium-Ion Batteries

Yasir Ali (), Imran Shah (), Tariq Amin Khan and Noman Iqbal
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Yasir Ali: Department of Aerospace Engineering, College of Aeronautical Engineering, National University of Science and Technology, Risalpur 24090, Pakistan
Imran Shah: Department of Mechanical Engineering, International Islamic University (IIUI), Islamabad 44000, Pakistan
Tariq Amin Khan: Department of Aerospace Engineering, College of Aeronautical Engineering, National University of Science and Technology, Risalpur 24090, Pakistan
Noman Iqbal: Department of Mechanical, Robotics and Energy Engineering Dongguk University, Seoul 04620, Republic of Korea

Energies, 2023, vol. 16, issue 15, 1-15

Abstract: Understanding the electrochemical and mechanical degradations inside the electrodes of lithium-ion battery is crucial for the design of robust electrodes. A typical lithium-ion battery electrode consists of active particles enclosed with conductive binder and an electrolyte. During the charging and discharging process, these adjacent materials create a mechanical confinement which suppresses the expansion and contraction of the particles and affects overall performance. The electrochemical and mechanical response mutually affect each other. The particle level expansion/contraction alters the electrochemical response at the electrode level. In return, the electrode level kinetics affect the stress at the particle level. In this paper, we developed a multiphysics–multiscale model to analyze the electrochemical and mechanical responses at both the particle and cell level. The 1D Li-ion battery model is fully coupled with 2D representative volume element (RVE) model, where the particles are covered in binder layers and bridged through the binder. The simulation results show that when the binder constraint is incorporated, the particles achieve a lower surface state of charge during charging. Further, the cell charging time increases by 7.4% and the discharge capacity reduces by 1.4% for 1 C-rate charge/discharge. In addition, mechanical interaction creates inhomogeneous stress inside the particle, which results in particle fracture and particle–binder debonding. The developed model will provide insights into the mechanisms of battery degradation for improving the performance of Li-ion batteries.

Keywords: lithium-ion battery; stress–potential coupling; multiphysics–multiscale model; binder constraint; charge rates; electrochemical performance (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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