fig7

Figure 7. Effect of self-healing on the CoFeHCF electrode and electrolyte. SEM images (A) and XPS spectra (B) of CoFeHCF at selected charge/discharge states. (C) concentration variations of Fe and Co in electrolytes for the CoFeHCF electrode at the 21st and 22nd cycles. (D) a schematic of the ‘‘electrochemically driven dissolution-recrystallisation process”. (E) the energy barrier for the diffusion of the potassium ion in CoFeHCF and the model for the migration pathways in the crystal model. (F) a comparison of the cycling performance at 0.1 A·g^-1 between the two samples and (G) selected discharge/charge profiles of CoFeHCF and FeHCF (reprinted with permission^[86]).