Advantages of Odd Random Phase Multisine Electrochemical Impedance Measurements

Abstract

Electrochemical impedance spectroscopy (EIS) is a powerful technique to study electrochemical processes and to perform screening tasks. Recently an integrated measuring and modeling methodology for EIS based on a multisine excitation signal was developed. A key issue in this methodology is the data analysis, allowing us to rapidly quantify the reliability of the measured data. In this paper, a comparison is made between classical single-sine and the proposed multisine measurements on the same system. The fitting of the impedance data obtained by single-or multisine excitation and using different weighting factors is also discussed. In addition to the advantages reported in earlier work, it is concluded that, of all investigated frequencies, the odd random phase multisine excitation yields the highest quality data in the shortest measurement time.

Measurements of Electric Performance and Impedance of a 75 Ah NMC Lithium Battery Module

“…Just as we did with the measurements of the battery module impedance spectra shown in Figure 5, the spectra were measured both with the single sine measurement method and with the TDM measurement method. Again, R s was fixed in order to assure a stable conversion of the fitting routine using the expression in (6). The obtained impedance data is shown in Figure 6.…”

“…6 Further, real-parallel impedance solutions like the 'PAD4' by Zahner can measure impedance on several cells simultaneously. Unfortunately, the equipment for both multisine and real-parallel techniques is generally more expensive than the equipment used for the presented measurement technique.…”

Nonparametric Analysis of Nonlinear Distortions for Biomolecular Systems

“…Another natural task for future is to use this technique for analysing nonlinear distortions in more complex and larger biomolecular systems. The application and design of the random-phase multisine signals has already been proven in many of the real life biological and electrochemical case studies experimentally (Van Ingelgem et al, 2009;Sanchez and Bragos, 2009;Olarte et al, 2014), hence designing these signal in practice is not cumbersome and difficult at all with all the modern as well as cheap instrumentation and data acquisition equipment available.…”

A complete impedance analysis of electrochemical cells used as energy sources

“…The development of digital techniques has contributed to the increase of popularity of the method [36][37][38][39][40][41][42][43], and it has been appreciated sufficiently to be introduced to commercial applications (http://www.gamry.com/ App_Notes/PDF/OptiEISAppNote.pdf).…”