Comparison of Electronic Resistance Measurement Methods and Influencing Parameters for LMFP and High-Nickel NCM Cathodes

The automotive industry aims for the highest possible driving range (highest energy density) in combination with a fast charge ability (highest power density) of electric vehicles. With both targets being intrinsically contradictory, it is important to understand and optimize resistances within lith...

Full description

Saved in:
Bibliographic Details
Published inBatteries (Basel) Vol. 10; no. 3; p. 105
Main Authors Seidl, Christoph, Thieme, Sören, Frey, Martin, Nikolowski, Kristian, Michaelis, Alexander
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.03.2024
Subjects
Automobile industry
Automobiles
Carbon
cathode
Cathodes
Charge density
Comparative analysis
conductive additives
Contact resistance
Design
Electric contacts
Electric vehicles
Electrochemical impedance spectroscopy
electrode characterisation methods
Electrodes
Electrolytes
electronic limitations
Electrons
Flux density
Lithium-ion batteries
lithium-ion battery
Measurement methods
Methods
Nickel
Parameters
Porosity
Rechargeable batteries
Germany
Online AccessGet full text

Cover

More Information
Summary:The automotive industry aims for the highest possible driving range (highest energy density) in combination with a fast charge ability (highest power density) of electric vehicles. With both targets being intrinsically contradictory, it is important to understand and optimize resistances within lithium-ion battery (LIB) electrodes. In this study, the properties and magnitude of electronic resistance contributions in LiMn0.7Fe0.3PO4 (LMFP)- and LiNixCoyMnzO2 (NCM, x = 0.88~0.90, x + y + z = 1)-based electrodes are comprehensively investigated through the use of different measurement methods. Contact resistance properties are characterized via electrochemical impedance spectroscopy (EIS) on the example of LMFP cathodes. The EIS results are compared to a two-point probe as well as to the results obtained using a novel commercial 46-point probe system. The magnitude and ratio of contact resistance and compound electronic resistance for LMFP- and NCM-based cathodes are discussed on the basis of the 46-point probe measurement results. The results show that the 46-point probe yields significantly lower resistance values than those in EIS studies. Further results show that electronic resistance values in cathodes can vary over several orders of magnitude. Various influence parameters such as electrode porosity, type of current collector and the impact of solvent soaking on electronic resistance are investigated.
ISSN:2313-0105
2313-0105
DOI:10.3390/batteries10030105