Determination of reliable resistance values for electrical double-layer capacitors

IF 5.4 Q2 CHEMISTRY, PHYSICAL Journal of Power Sources Advances Pub Date : 2022-08-01 DOI:10.1016/j.powera.2022.100098

Lukas Köps , Pietro Zaccagnini , Candido Fabrizio Pirri , Andrea Balducci

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Abstract

The power capabilities of supercapacitors are strongly influenced by their passive elements. Within this study, we investigate methods to address resistive components out of galvanostatic measurements and we compared literature methods with the aim to provide a guide to correctly exploit the resistance of supercapacitors. The impact of the sampling conditions of galvanostatic measurements is analyzed and related to electrochemical impedance spectroscopy. Further, a novel method based on the instantaneous power analysis is provided to get real-time information concerning the actual cell resistance during the measurement without altering the galvanostatic experiment. Measurements show that literature methods can provide values close to the series resistance, while the newly proposed power method results in a good estimate of the actual dissipative value.

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双层电容器可靠电阻值的测定

超级电容器的功率性能受其无源元件的影响很大。在本研究中，我们研究了解决恒流测量中电阻成分的方法，并比较了文献方法，目的是为正确利用超级电容器的电阻提供指导。分析了恒流测量中采样条件的影响，并将其与电化学阻抗谱联系起来。此外，提出了一种基于瞬时功率分析的新方法，在不改变恒流实验的情况下，在测量过程中获得有关实际电池电阻的实时信息。测量结果表明，文献方法可以提供接近串联电阻的值，而新提出的功率法可以很好地估计实际耗散值。

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