Fig. 6: Temperature dependence of EPR signals for pristine and ball-milled HC samples. | Nature Communications

Fig. 6: Temperature dependence of EPR signals for pristine and ball-milled HC samples.

From: Electron paramagnetic resonance as a tool to determine the sodium charge storage mechanism of hard carbon

Fig. 6: Temperature dependence of EPR signals for pristine and ball-milled HC samples.

a pristine material, b, d broad and c, e narrow signal contributions obtained by lineshape simulation for ball-milled HC700 and HC1000 samples. The DI value of the EPR signal is proportional to the spin density and is calculated from the absolute area value of the EPR signal. The solid line in the spectra shows the Curie–Weiss fitting results. f Normalised DI value (refers to the spin susceptibility) × T vs. T of the simulated signals of HC700 and HC100 pristine materials and broad signals of the ball-milled samples shown in Fig. 6a, b and d. A mass of 1 mg of sample was used in the measurements. Source data are provided as a Source Data File.

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