SCIENTIFIC SOFTWARE / RESEARCH & FACTORY DATA REVIEW
ImpedanceIQ
OPEN REFERENCE DATA / PUBLIC MEASUREMENT

Nyquist and Bode.
Measured, not simulated.

Inspect a published NMC811 21700 lithium-ion battery EIS spectrum at 30% SoC. Import another standard three-column CSV for local inspection. Data remains in the browser; no server processing. This is a measurement-visualization reference, not a Kramers-Kronig pass/fail certification or a chemistry diagnosis.

PUBLIC DATA / SPECTRUM INSPECTOR
NYQUIST · X: RE(Z) [mΩ] / Y: −IM(Z) [mΩ]
BODE · LOG FREQUENCY / |Z| [mΩ]
- valid data points
- frequency range Hz
- integrity flags

Loading publicly reported impedance points…

SOURCE AND METHOD

A transparent reference.

Data curator: Manuel Moertelmaier, Manuel Kasper and Simon Clark; measured NMC811 cells published on Zenodo. Dataset: “EIS data of 54 21700 cells,” record 15422339, ID01.csv. CC BY 4.0; the viewer renames columns and displays impedance in mΩ.

Open source & metadata ↗

The site plots original signed imaginary Z, with Nyquist displaying −Im(Z). Positive raw Im(Z) at higher frequencies therefore appears below zero. This is not automatically an instrument error.

Limit 100 kB. Required header columns: Frequency_Hz, Real_Ohm, Imag_Ohm (exactly three columns; one spectrum only). Signed Imag_Ohm; no silent sign reversal.

Public demonstration scope: file integrity flags and basic plotting only. There is no automated outlier rejection, physical model identification, IEC certification, Lin-KK accept/reject, or battery SOH prediction.