Notably, the single-crystal morphology is favorable to prevent particle cracking at high voltages, as this leads to changes in electrochemical surface area . The electronic resistance of the electrodes, and particularly contact resistance with the current collector, must be completely eliminated to obtain the most accurate measurements. This typically requires calendaring the electrode at high pressures, using a carbon-coated aluminum current collector, and maintaining high stack pressure during testing, but usually does not require large amounts of conductive carbon . Contact resistance, like pore resistance, can be easily measured with PEIS of symmetric cells under blocking conditions . Other than the low loading, the properties of the electrodes used in this work are comparable to those used in commercial cells; the LCO electrodes contain 97.5 wt% AM, are calendared to a density of 4.0 g cm -3 (~ 20% porosity), and show no measurable contact resistance.