Welcome to Journal of Automotive Safety and Energy,

Journal of Automotive Safety and Energy ›› 2021, Vol. 12 ›› Issue (4): 570-579.DOI: 10.3969/j.issn.1674-8484.2021.04.016

• Automotive Energy Efficiency and Environment Protection • Previous Articles     Next Articles

Lithium plating identification based on electrochemical impedance spectra of lithium ion batteries

DONG Peng1(), ZHANG Jianbo1,2,*(), WANG Zhenpo1   

  1. 1. Beijing Co-innovation Center for Electric Vehicles, Beijing Institute of Technology, Beijing 100081, China
    2. State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China
  • Received:2021-06-21 Online:2021-12-31 Published:2022-01-10
  • Contact: ZHANG Jianbo E-mail:dongpeng66@139.com;jbzhang@tsinghua.edu.cn

Abstract:

The EIS-Ohm method and the EIS-SEI method were proposed based on the variation tendency of electrochemical impedance spectroscopy (EIS) in different temperatures for the lithium ion batteries with and without lithium plating, and the equivalent circuit model was applied to fit the Ohmic impedance and the solid-electrolyte interface impedance in the EIS respectively. With temperature increase, the EIS of the lithium plating batteries showed an increase and then a decrease in Ohmic impedance, while the impedance at the solid-electrolyte interface showed a smaller change. Scanning electron microscopy (SEM) and chemical methods were used to determine the morphology and chemical transformation of the plating lithium metal from the electrode surface. The feasibility of two lithium identification methods was discussed by combining the operating temperature (-10~60 °C) and detection time (> 21 min) of the battery. The results show that the two detection methods developed based on electrochemical impedance spectroscopy can clearly identify the lithium plating, and the rapid, non-dissembling identification methods have important applications for battery life and safety management.

Key words: lithium ion battery, electrochemical impedance spectra, lithium plating identification, Ohmic impedance, interface impedance

CLC Number: