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Determination of charging current for lithium plating boundary based on dynamic single-frequency impedance

Author

Listed:
  • Shen, Yudong
  • Jiang, Zhao
  • Wang, Xueyuan
  • Chen, Daidai
  • Li, Haiwei
  • Jiang, Jianjun
  • Dai, Haifeng
  • Wei, Xuezhe

Abstract

Determining the maximum charging current without causing lithium plating is crucial for lithium-ion batteries with long life and high safety. A novel method is proposed based on the dynamic single-frequency impedance. A new feature called the K-point was identified. It appears only under conditions without lithium plating. The clear definition of the K-point's nature resolves the misdiagnosis of lithium plating by the impedance method. By combining experiments and simulations, we found that the K-point comes from a phase change in the graphite anode. Combined with the lithium plating characteristic point (P-point), we divided the changes in the characteristic impedance curve during charging into three stages. Based on this, we proposed an adaptive charging map. This method provides an efficient way to find the fast-charging current limit for Li-ion batteries, hence offering a new idea for developing fast-charging strategies.

Suggested Citation

  • Shen, Yudong & Jiang, Zhao & Wang, Xueyuan & Chen, Daidai & Li, Haiwei & Jiang, Jianjun & Dai, Haifeng & Wei, Xuezhe, 2026. "Determination of charging current for lithium plating boundary based on dynamic single-frequency impedance," Energy, Elsevier, vol. 350(C).
    • Handle: RePEc:eee:energy:v:350:y:2026:i:c:s0360544226008169
    DOI: 10.1016/j.energy.2026.140713
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