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<p>Rich-Ni cathode NCM811 can significantly enhance the energy. However, the higher Ni content easily leads to the thermal instability. In this study, the electrochemical and thermal performance of cylindrical 18,650 LiNi₀.₈Co₀.₁Mn₀.₁O₂/graphite batteries with different state-of-health (SOH) were investigated. The key factors considered for the performance include high temperature storage, surface temperature, impedance, heat generation power, material structure and morphology. The batteries show excellent cycle efficiency of 88.7%, 88.5% and 88.4% after 500 cycles with 0.5 C/1 C/2 C current, respectively. In short-term high-temperature storage, the voltage of 80%SOH battery is reduced by 0.09&#xa0;V, and the H1 peak strength is significantly reduced in dQ/dV curves. The temperature rise show that the 80% SOH battery’s maximum temperature rise up to 40.8 °C at 3 C. The state-dependent EIS analysis reveals a strong positive correlation between impedance growth and cycle aging, where <i>R</i><sub>hf</sub> (SEI resistance) and <i>R</i><sub>lf</sub> (charge transfer resistance) exhibit temperature-dependent escalation rates. Heat generation was quantitatively analyzed through DC internal resistance and entropy coefficient measurements, revealing significant SOH-dependent characteristics. The 80% SOH battery exhibits 10.3% higher maximum reversible heat power (1.202 W vs. 1.090 W) and 5.6% greater irreversible heat power (0.948 W vs. 0.898 W) compared to pristine cells (100% SOH). The findings in this work are important to evaluate their thermal behavior and promote the development of battery management systems.</p>

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State-dependent EIS analysis for electrochemical-thermal performance evaluation of LiNi₀.₈Co₀.₁Mn₀.₁O₂/graphite batteries

  • 期刊论文

  • 发表日期：

    2025年5月10日

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  • Chao Zhang,
  • Xiaoyu Zhang,
  • Xianlong Wu,
  • Ting Yi,
  • Quanhui Hou,
  • Feng Gong,
  • Xing Qian,
  • Yonglian Xiong

摘要

Rich-Ni cathode NCM811 can significantly enhance the energy. However, the higher Ni content easily leads to the thermal instability. In this study, the electrochemical and thermal performance of cylindrical 18,650 LiNi₀.₈Co₀.₁Mn₀.₁O₂/graphite batteries with different state-of-health (SOH) were investigated. The key factors considered for the performance include high temperature storage, surface temperature, impedance, heat generation power, material structure and morphology. The batteries show excellent cycle efficiency of 88.7%, 88.5% and 88.4% after 500 cycles with 0.5 C/1 C/2 C current, respectively. In short-term high-temperature storage, the voltage of 80%SOH battery is reduced by 0.09 V, and the H1 peak strength is significantly reduced in dQ/dV curves. The temperature rise show that the 80% SOH battery’s maximum temperature rise up to 40.8 °C at 3 C. The state-dependent EIS analysis reveals a strong positive correlation between impedance growth and cycle aging, where Rhf (SEI resistance) and Rlf (charge transfer resistance) exhibit temperature-dependent escalation rates. Heat generation was quantitatively analyzed through DC internal resistance and entropy coefficient measurements, revealing significant SOH-dependent characteristics. The 80% SOH battery exhibits 10.3% higher maximum reversible heat power (1.202 W vs. 1.090 W) and 5.6% greater irreversible heat power (0.948 W vs. 0.898 W) compared to pristine cells (100% SOH). The findings in this work are important to evaluate their thermal behavior and promote the development of battery management systems.