Fig. 7: Ex situ EPR data on pristine HC700 and HC1000 samples cycled in Na half-cells.

EPR spectra with simulated signals of pristine HC700 (a) and HC1000 (b) discharged samples to 0.5 and 0.02āV. Temperature-dependence behaviour of simulated EPR data components in pristine c HC700 and d HC1000 electrode samples discharged to 0.02āV. Source data are provided as a Source Data File.