NMR spectroscopy experiments were carried out with a Bruker Avance Neo spectrometer in a Bruker 2.5 mm HX double resonance probe. Measurements were carried out at a magnetic field strength of 9.4 T, corresponding to a 1 H Larmor frequency of 400.1 MHz. All spectra were acquired with a 90°pulse-acquire sequence at a sample spinning speed of 5 kHz. 5 kHz was selected as it gave resolved spectra and avoided excessive frictional heating effect and centrifugation . Recycle delays were set to be more than five times T1 for each sample to ensure that the experiments were quantitative, which are 8-12 s for the studied carbons. 19 F NMR spectra were referenced relative to neat hexafluorobenzene (C6F6) at -164.9 ppm as a secondary reference. 1 H NMR spectra were referenced relative to the CH3 resonance of ethanol (C2H6O) at 1.2 ppm as a secondary reference. 31 P NMR spectra were referenced relative to 85% phosphoric acid (H3PO4) at 0 ppm. NMR spectra were deconvoluted and fitted in DMfit values. The Δδ values were simulated using a previously developed lattice model , which describes diffusion of fluid molecules in porous carbons and predicts NMR spectra of those species. The lattice used to represent an electrolyte filled carbon particle corresponds to a collection of pore sizes for which a set of quantities have to be defined: i) a pore size, ii) a quantity of adsorbed ions and iii) a chemical shift.