A new method to compensate impedance artefacts for Li-ion batteries with integrated micro-reference electrodes

作者：Raijmakers L H J; Lammers M J G; Notten P H L^*

来源：Electrochimica Acta, 2018, 259: 517-533.

DOI：10.1016/j.electacta.2017.10.132

• Electrochemical Impedance Spectroscopy
• Lithium ion batteries
• Three-electrode cell
• Micro-reference electrodes
• Impedance measurement artefacts

In order to measure the electrochemical characteristics of both electrodes inside Li-ion batteries, micro-reference electrodes (mu REF) turned out to be very useful. However, measuring the electrochemical impedance with respect to mu REF can lead to severe measurement artefacts, making a detailed analysis of the impedance spectra complicated. In the present work a new method is developed in which high-frequency measurement artefacts can be compensated. A theoretical analysis, using equivalent circuit models of the measurement setups, shows that if two different impedance measurements are averaged, the impedance contributions from the measurement leads can be completely eliminated. The theoretical analysis is validated using Li-ion batteries with seven integrated mu REF, having all different impedances. The measurement results show that artefacts are dominating for high-impedance mu REF in the high frequency range. However, these artefacts can be fully compensated by averaging two separate impedance measurements, as predicted by theory. This easily makes it possible to perform artefact-free impedance measurements, even at high frequencies.

• 出版日期2018-1-1