Electrochemical impedance spectroscopy (EIS) is a useful diagnostics technique for lithium-ion batteries but measurements can last several hours. Fast pulse impedance spectroscopy (PIS) is thus proposed using just 2 minutes of pulse perturbation data and classic signal processing techniques. The method is verified using experimental data collected from 6 lithium-ion cells aged under different temperatures and charging levels. Results show that PIS can extract high-quality Nyquist plots for overpotential analysis. Comparison is made between the frequency- and time-domains using the Randles and convolution-defined diffusion equivalent circuit models. PIS is a practical time-domain impedance spectroscopy method that experimentally links EIS and convolution-defined diffusion.
Fast Time-domain Impedance Spectroscopy of Lithium-ion Batteries using Pulse Perturbation
2022-06-15
5366153 byte
Conference paper
Electronic Resource
English
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