Fig. 5 | Nature Communications

Fig. 5

From: NASICON-type air-stable and all-climate cathode for sodium-ion batteries with low cost and high-power density

Fig. 5

Crystal structure, Na+ ion diffusion paths, different types of Na+ ions in a single unit, and corresponding migration energy barriers. a, c, d Various images of the crystal structure of Na4Fe3(PO4)2(P2O7) material with three different types of Na+ ions. b The migration energy barriers within the same Na+ ion groups. e The migration energy barriers between different Na+ ion groups (equivalent to three-dimensional diffusion pathways)

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