I tried parameterizing an ECM model with an EIS experimental data set using Matlab lsqcurvefit solver.

The resulting EIS is in an acceptable range if you see the attached figures. But my doubt is, the parameters seem erroneous with the physical meaning of it, which came as complex numbers as mentioned below.

Estimated Rs: 0.025413-0.0014315i

Estimated Rp: 0.0059842+0.00029675i

Estimated Rp2: 0.0084706-0.0064812i

Estimated C1: 1.5673-3.6365i

Estimated C2: 622.50351-879.48651i

Estimated C3: -382692.0319-230519.3501i

Estimated n: -0.83909+0.22546i

If anyone can please comment on this.

I appreciate your support.

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