Nanomanufacturing – Key Control Characteristics – Part 4-18: Nano-enabled energy storage – Electrochemical characterization: Electrochemical impedance spectroscopy

This part of IEC 62607 specifies a standardized methodology for the electrochemical characterization of nano-enabled energy storage materials and devices using Electrochemical Impedance Spectroscopy (EIS). The method defines key control characteristics (KCCs), such as solution resistance, charge transfer resistance, double-layer capacitance, and Warburg impedance, which are critical for evaluating ionic transport, charge transfer efficiency, and interfacial processes. The characterization utilizes Nyquist diagrams to visualize impedance data and employs Equivalent Circuit Models (ECMs), such as the modified and extended Randles model, to fit the measurement curves and extract KCCs with precision. This approach supports consistent evaluation of material and system performance. The standard applies to nano-enabled materials and advanced battery technologies, including lithium-ion, solid-state, and emerging chemistries, ensuring uniformity in measurement conditions, data analysis, and interpretation across research, development, and production environments.