Deep Learning algorithm, based on convolutional neural networks, for equivalent electrical circuit recommendation for Electrochemical Impedance Spectroscopy

• A new Deep Learning algorithm was developed for EEC recommendation for EIS spectra • Convolutional Neural Networks were optimized for the first time for EEC recommendation • The algorithm achieved better recommendation accuracies than previous AI algorithms • The algorithm was applied to an experimental EIS of a commercial Li-V2O5 battery • Though the results are far from perfect, CNNs seem promising for EEC recommendation Electrochemical Impedance Spectroscopy (EIS) is a technique widely used in the field of electrochemistry, due to its ability to probe the dynamics of electrochemical systems. Commonly, EIS spectra are analysed using Equivalent Electrical Circuits (EECs). The EEC selection is not trivial. For this reason, Digby D. Macdonald proposed the Electrochemical Genome Project, which would consist of a large database of EIS spectra and an Artificial Intelligence able to recommend EECs given an experimental EIS spectrum. In this work, we developed a Deep Learning algorithm, based on Convolutional Neural Networks (CNNs), for EEC recommendation for EIS spectra. To achieve this, we optimized the CNN in 3 sequential stages: first, the convolutional architecture was optimized; then, the Initial Learn Rate was selected; and finally, the dense network architecture was optimized. At the end of this process, we obtained a CNN model with a maximum test accuracy of 61.11%. The obtained results show that CNNs are good candidates for EEC recommendation tools for EIS spectra.