Embedded EIS

The BioLogic Embedded EIS module is a software and hardware feature that enables electrochemical impedance spectroscopy (EIS) measurements to be performed simultaneously during battery cycling, corrosion monitoring, or other ongoing electrochemical experiments — without pausing or interrupting the primary measurement protocol. This in-operando EIS capability overcomes a fundamental limitation of traditional EIS, where the cell must be at a defined steady-state condition and the primary measurement must be stopped to perform impedance analysis.

With Embedded EIS, the impedance spectrum is acquired periodically or continuously during the experiment — for example, every few cycles during battery cycling — revealing how the cell impedance evolves over time, over charge/discharge cycles, or during aging processes. This is especially valuable for battery research, where the evolution of SEI (solid electrolyte interphase) resistance, charge transfer resistance, and diffusion parameters during cycling provides mechanistic insight into degradation and capacity fade that cannot be obtained from post-hoc EIS measurements.

The Embedded EIS approach uses optimized perturbation waveforms that minimize disruption to the ongoing experiment while providing sufficient signal-to-noise ratio for accurate impedance determination. The impedance data acquired during embedded measurement is fully compatible with BioLogic Z Fit and EC-Lab analysis tools. NewRoad provides the BioLogic Embedded EIS capability in Israel as part of the BioLogic accessories and software ecosystem for battery and corrosion research laboratories.