Fast electrochemical impedance spectroscopy of lithium-ion batteries based on the large square wave excitation signal

Lujun Wang; Ziang Song; Lijun Zhu; Jiuchun Jiang

doi:10.1016/j.isci.2023.106463

Fast electrochemical impedance spectroscopy of lithium-ion batteries based on the large square wave excitation signal

iScience. 2023 Mar 22;26(4):106463. doi: 10.1016/j.isci.2023.106463. eCollection 2023 Apr 21.

Authors

Lujun Wang¹, Ziang Song¹, Lijun Zhu¹, Jiuchun Jiang¹

Affiliation

¹ Hubei University of Technology, Hubei Key Laboratory for High-efficiency Utilization of Solar Energy and Operation Control of Energy Storage System, Wuhan 430068, Hubei Province, China.

Abstract

Electrochemical impedance spectroscopy (EIS) is a technique for electrochemical characterization that is sensitive to the battery state and can uncover multidimensional electrochemical evolution information within the battery. Lithium-ion batteries usually need to be used in conjunction with power conversion circuits, while conventional EIS testing is conducted offline and is time-consuming, which cannot effectively monitor the battery characteristics during use. To match the characteristics of the square wave signal during power switching, a rapid EIS measurement method for lithium-ion batteries based on the large square wave excitation signal is proposed in this paper, and develops a testing device with a response time of microseconds. The proposed method and device are applied to estimate the state of health (SOH) of the battery. In conclusion, we proposed method enhances the capabilities of EIS testing technology and has a good application prospect in real-time online impedance monitoring.

Keywords: Applied sciences; Electrochemistry; Energy systems.