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<p>Mechanical deformation at high state of charge (SOC) poses a critical safety and durability challenge for lithium-ion batteries. This study investigates magneto-mechanical degradation mechanisms in a 32650 cylindrical lithium-ion cell at 100% SOC subjected to three-point bending using comprehensive electrochemical impedance spectroscopy analysis. Impedance kinetics demonstrates changes in solid electrolyte interphase (SEI), charge transfer resistance, and lithium-ion diffusion behavior. High-resolution microstructural analysis reveals severe cracking, delamination, and rupture of the SEI on the anode, driven by lithiation-induced volume expansion coupled with bending stress, leading to particle disconnection and increased impedance. The separator exhibits localized tearing, pore collapse, and structural compaction. Cathode analysis reveals granular compaction, micro-crack propagation, and particle detachment, particularly in lithium-rich phases. Three-dimensional profilometry confirms pronounced surface deformation (<i>R</i><sub>a</sub> = 1.446&#xa0;µm; <i>R</i><sub><i>z</i></sub> = 11.15&#xa0;µm). FTIR and TGA reveal a complex SEI chemistry and multi-stage thermal decomposition.</p>

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Magneto-Mechanical Effects on the Performance of Cylindrical Li-Ion Batteries: Insights from EIS and Surface Morphology

  • 期刊论文

  • 发表日期：

    2026年6月29日

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  • Shilajit Das,
  • Shashi Bhushan Arya

摘要

Mechanical deformation at high state of charge (SOC) poses a critical safety and durability challenge for lithium-ion batteries. This study investigates magneto-mechanical degradation mechanisms in a 32650 cylindrical lithium-ion cell at 100% SOC subjected to three-point bending using comprehensive electrochemical impedance spectroscopy analysis. Impedance kinetics demonstrates changes in solid electrolyte interphase (SEI), charge transfer resistance, and lithium-ion diffusion behavior. High-resolution microstructural analysis reveals severe cracking, delamination, and rupture of the SEI on the anode, driven by lithiation-induced volume expansion coupled with bending stress, leading to particle disconnection and increased impedance. The separator exhibits localized tearing, pore collapse, and structural compaction. Cathode analysis reveals granular compaction, micro-crack propagation, and particle detachment, particularly in lithium-rich phases. Three-dimensional profilometry confirms pronounced surface deformation (Ra = 1.446 µm; Rz = 11.15 µm). FTIR and TGA reveal a complex SEI chemistry and multi-stage thermal decomposition.