Manuscript "Towards carbon-free cathodes for fluoride ion batteries: deconvoluting effects of active material and conductive additive on charging and cyclic stability" Page 9 of 18 sizes expected for Super P , which should allow the conductive nanoparticles to form a percolating network at similar volume fractions as was previously used for Super P. The CV of Super P shows an oxidative peak of nearly 15 µA in the first cycle around 1.5 V against Pb/PbF2 with no corresponding anodic peak. This peak is due to irreversible fluorination of carbon as previously discussed by Nowroozi et al. . In subsequent cycles the peak current decreases continuously, as well as the current due to gold fluorination above 2.3 V against Pb/PbF2. The continuous decrease in the peak current can be either interpreted as a saturation of the carbon fluorination by a passivating effect, or as a deterioration of the conductivity of the cathode composite, due to carbon fluorination.