I am developing an algorithm which will identify the battery equivalent circuit parameters. I have EIS data from frequency ranging 7.81kHz to 0.7Hz, but I want to use data only from 1kHz (where zero crossing occurs) to 1Hz (where diffusion process starts). My aim is to define frequency ranges in between high, medium and low within 1kHz to 1Hz.

It would be really nice if one can share any publication which will support my above task.