Electrochemical impedance spectroscopy (EIS) is a robust characterization tool for lithium-ion batteries (LIBs). It has been extensively used to investigate new battery materials , and in recent years, it also has been proposed as an essential building block for next generation of battery management systems . Thanks to modern EIS instrumentation, a single EIS measurement can sweep a broad frequency range, capturing the characteristic frequency responses associated with essential electrochemical processes within a battery system. However, analysis of EIS data often focuses on the high to intermediate frequency ranges, which are related to the dielectric properties of battery components and the charge-transfer process, respectively. On the other hand, impedance associated with mass transport phenomena in the low frequency range is often deprioritized or completely overlooked . This trend can primarily be attributed to the presence of anomalous solid-state diffusion impedance in LIBs at low frequency ranges, which deviates from the standard finite-length Warburg (FLW) diffusion model based on Fickian diffusion .