Fig. 1: Comparison between the ICI and the GITT methods. | Nature Communications

Fig. 1: Comparison between the ICI and the GITT methods.

From: Rapid determination of solid-state diffusion coefficients in Li-based batteries via intermittent current interruption method

Fig. 1

a, b How the current is controlled in the ICI method and the GITT in this work on the same test time scale. c, d Electrode potential (E) versus step time (t) as a response from the current input in the dashed-line box in a and b, respectively. The blue dashed line indicates where the slope of open-circuit potential against current-passing time (∆EOC/∆tI) is obtained. e, f Electrode potential (E) plotted against the square root of step time (t0.5) with datapoints in the orange box in c, d, respectively. The orange line shows how the derivative (dE/d√t) is obtained. In c–f plots, the white background denotes the duration where a 0.1 C current is applied while the brown-shaded intervals are where no current is applied. Please refer to the explanation of Eq. 2 for the symbols used in the shared equation for both methods.

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