exampleData.csv
A headerless impedance.py example with frequency, real impedance, and signed imaginary impedance.
Electrochemistry · Hard
Equivalent-circuit analysis of impedance spectra
Fit prescribed circuit families, compare them with traceable metrics and residuals, and connect the frequency response to electrochemical processes without hiding uncertainty.
5 CSVsincluding source-verification layouts
66points in the generic example
61 × 2repeat SOC 100 scans
122points across two SOC 70 sweeps
What makes the input tricky
Cell_1 · SOC 100
Two independent 61-point GEIS scans plus the original side-by-side source layout for verification.
Cell_2 · SOC 70
A 122-point file containing two consecutive sweeps that must not be joined as one continuous curve.
Sign and ordering
The battery column stores −Im(Z); datasets also differ in frequency ordering and include high-frequency inductive points.
Required workflow
Validate representation
Separate independent scans, recover the complex-impedance sign convention, preserve repeated frequencies, and document preprocessing.
Fit declared candidates
Evaluate Randles, CPE, and fixed/free two-time-constant variants for the example and the prescribed two-CPE-plus-Warburg circuit for battery scans.
Compare evidence
Report convergence, parameter uncertainty, complex residuals, RMSE, and AICc rather than selecting a circuit by visual fit alone.
Interpret and source
Relate frequency ranges to physical processes, compare datasets, state limitations, and trace every external scientific claim.
Artifact contract
src/run_analysis.pyrequirements.txtfit_parameters.csvmodel_metrics.csvfitted_spectrum.csvnyquist_models.pngbode_models.pngresiduals.pnganalysis_report.mdprovenance.jsonrun_steps.md
The displayed file counts, scan structure, sign convention, and candidate families come from the agent-visible contract. No fitted or reference values are included.