Characterization of Electrodes for Lithium Batteries by Measuring their Apparent Electronic Resistivity

The electronic resistance of the electrode coating and its contact resistance with the current collector are among the key properties in determining electrode performances in lithium batteries (LiB). However, these values of resistance are surprisingly difficult to measure accurately for thin-film electrodes because of the mechanical fragility of the sample, the presence of the attached current collector and relatively large contact resistance between the sample and external probes. Moreover, when considering the manufacturing process of LiB electrodes, the task to find a method to qualify them in dry state would be very beneficial. The aim of this work was to investigate the electronic resistivity of the LiB electrodes, both anodes and cathodes, in dry state. The behavior of these electrodes under influence of the electrolyte was also investigated in symmetrical cells by Electrochemical Impedance Spectroscopy (EIS).