fig9

Figure 9. Solid-state ⁷Li NMR spectra of cycled CeO₂@void@C electrodes at different states. (A) Full spectra with the spinning sidebands marked with asterisks. The corresponding longitudinal relaxation time T₁ is noted to each spectrum. (B) The simulation region of the isotropic signal is marked by the rectangular dotted frame, as shown in (A). Blue signals are obtained from experiment and red-dashed curves are the sum of deconvolution. The chemical shifts and occupancies are marked for each simulated peak.