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As electric vehicles become widespread, studying battery aging, which affects lithium-ion battery stability, is increasingly vital. Impedance inevitably rises during battery use, with electrochemical impedance spectroscopy (EIS) being a comprehensive, non-destructive measurement tool. However, EIS is also influenced by state of charge (SOC), temperature, and pressure, limiting its use in assessing state of health (SOH). This paper establishes an electrochemical model for decoupling these factors and analyzes EIS changes due to aging. Anode aging significantly impacts EIS, while the cathode’s effect is minor. Using EIS and the model, key parameters are rapidly identified, enabling real-time SOH monitoring and evaluation, and supporting electric vehicle performance optimization and battery life extension.

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Impedance Analysis of Lithium-Ion Batteries Based on an Electrochemical Aging Model

  • 会议论文

  • 发表日期：

    2025年

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  • Jun Zhong,
  • Yan Li,
  • Jinqiao Du,
  • Jie Tian,
  • Chun Chang

摘要

As electric vehicles become widespread, studying battery aging, which affects lithium-ion battery stability, is increasingly vital. Impedance inevitably rises during battery use, with electrochemical impedance spectroscopy (EIS) being a comprehensive, non-destructive measurement tool. However, EIS is also influenced by state of charge (SOC), temperature, and pressure, limiting its use in assessing state of health (SOH). This paper establishes an electrochemical model for decoupling these factors and analyzes EIS changes due to aging. Anode aging significantly impacts EIS, while the cathode’s effect is minor. Using EIS and the model, key parameters are rapidly identified, enabling real-time SOH monitoring and evaluation, and supporting electric vehicle performance optimization and battery life extension.