Several round punches of 14 mm in diameter were taken from the dried electrodes and their thickness was measured. The electrodes were then pressed using a hydraulic press at 1.6 tons for 30 s. The press was released, and the electrodes were punched again to 10 mm diameter. The electrodes were then sandwiched between two Ni foils in an ionically blocking configuration and then inserted into a PEEK lined airtight press cell with stainless steel stamps. The press cell was fastened after pressing to 1 ton to perform the electrochemical measurements.