Breakthrough in Sodium Batteries: Gradient Anode Enables 200 Wh kg-1 Energy Density and Dendrite-Free Cycling (IMAGE)
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Figure 1 Design and characterization of gradient electrode. (a) Cross-sectional SEM image, the corresponding EDS mapping and the corresponding elemental line scan of NS/Na. (b) The measured potential of NS/Na. (c) Schematic illustration of the NS/Na electrode after Na plating and stripping process. (d) Cross-sectional SEM image, the corresponding EDS mapping and the corresponding elemental line scan of GNS/Na. (e) The measured potential of GNS/Na. (f) Schematic illustration of the GNS/Na electrode after Na plating and stripping process. We prepared cross-sectional samples of NS/Na and GNS/Na, measuring the potential in five 5-micrometer regions from top to bottom of the modified layer using KPFM (Fig. S7 and S8).
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