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Article

State-of-Charge Monitoring and Battery Diagnosis of Different Lithium Ion Chemistries Using Impedance Spectroscopy

1
Electrochemistry Laboratory, University of Applied Sciences (OTH), Kaiser-Wilhelm-Ring 23, 92224 Amberg, Germany 2 Diehl Aerospace GmbH, Donaustraße 120, 90451 Nürnberg, Germany
2
Diehl Aerospace GmbH, Donaustraße 120, 90451 Nürnberg, Germany
*
Author to whom correspondence should be addressed.
Received: 28 December 2020 / Revised: 31 January 2021 / Accepted: 15 February 2021 / Published: 4 March 2021
(This article belongs to the Special Issue Lithium-Ion Batteries: Latest Advances and Prospects II)
For lithium iron phosphate batteries (LFP) in aerospace applications, impedance spectroscopy is applicable in the flat region of the voltage-charge curve. The frequency-dependent pseudocapacitance at 0.15 Hz is presented as useful state-of-charge (SOC) and state-of-health (SOH) indicator. For the same battery type, the prediction error of pseudocapacitance is better than 1% for a quadratic calibration curve, and less than 36% for a linear model. An approximately linear correlation between pseudocapacitance and Ah battery capacity is observed as long as overcharge and deep discharge are avoided. We verify the impedance method in comparison to the classical constant-current discharge measurements. In the case of five examined lithium-ion chemistries, the linear trend of impedance and SOC is lost if the slope of the discharge voltage curve versus SOC changes. With nickel manganese cobalt (NMC), high impedance modulus correlates with high SOC above 70%. View Full-Text
Keywords: battery life testing; capacitance; state-of-charge determination; state-of-health; aging; impedance spectroscopy; pseudocharge; lithium-ion battery battery life testing; capacitance; state-of-charge determination; state-of-health; aging; impedance spectroscopy; pseudocharge; lithium-ion battery
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MDPI and ACS Style

Kurzweil, P.; Scheuerpflug, W. State-of-Charge Monitoring and Battery Diagnosis of Different Lithium Ion Chemistries Using Impedance Spectroscopy. Batteries 2021, 7, 17. https://0-doi-org.brum.beds.ac.uk/10.3390/batteries7010017

AMA Style

Kurzweil P, Scheuerpflug W. State-of-Charge Monitoring and Battery Diagnosis of Different Lithium Ion Chemistries Using Impedance Spectroscopy. Batteries. 2021; 7(1):17. https://0-doi-org.brum.beds.ac.uk/10.3390/batteries7010017

Chicago/Turabian Style

Kurzweil, Peter, and Wolfgang Scheuerpflug. 2021. "State-of-Charge Monitoring and Battery Diagnosis of Different Lithium Ion Chemistries Using Impedance Spectroscopy" Batteries 7, no. 1: 17. https://0-doi-org.brum.beds.ac.uk/10.3390/batteries7010017

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