Fig. 3: Interface chemistry on NFS-H-based positive electrode. | Nature Communications

Fig. 3: Interface chemistry on NFS-H-based positive electrode.

From: Bridging multiscale interfaces for developing ionically conductive high-voltage iron sulfate-containing sodium-based battery positive electrodes

Fig. 3

a Scheme of interfacial adsorption and CEI formation. The blue flat column represents the positive active material, and the ball on the right represents the ions and solvent molecules in the electrolyte. The small flat panel in the middle represents the CEI produced by the decomposition of the electrolyte. The green and red areas on the left represent organic and inorganic species within the CEI, respectively, and the dashed lines in white represent the transport paths of sodium ions within the CEI. b Electron density distributions of (11-2) and (200) planes of Na2.26Fe1.87(SO4)3, respectively. c Interfacial adsorption and decomposed behaviors of electrolyte components (FEC and ClO4-) on different cathode crystal planes with corresponding adsorption distances and bond rupture energies. d Calculated models. Blue, dark gray, light yellow, lilac, gray, light pink, green, and water balls represent Na, Fe, S, O, C, H, Cl, and F atoms, respectively. The sticks represent the chemical bonds between atoms, and the red dotted line represents the positions where the bond breaks.

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