Fig. 1: Estimating battery capacity. | Nature Communications

Fig. 1: Estimating battery capacity.

From: Identifying degradation patterns of lithium ion batteries from impedance spectroscopy using machine learning

Fig. 1

a Estimated (red curve) and measured (blue curve) capacity as a function of cycle number for the 25C05 cell. The coefficient of determination (R2) of this model is shown on the left bottom. b The measured capacity against the estimated capacity of all four testing cells cycled at 25 °C. The capacity is normalised against the starting capacity in each case. c ARD shows that the impedance at low frequency is most correlated with degradation. The pink points correspond to the 120 frequencies in the range of 0.02 Hz–20 kHz. The GPR model assigns the largest weights to the 91st and 100th features, corresponding to 17.80 and 2.16 Hz, respectively. The less relevant features have weights close to zero.

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