A Novel Open-Framework Cu-Ge-Based Chalcogenide Anode Material for Sodium-Ion Battery
(a) The ball and stick mode of icosahedral [Cu8Se19]24− cluster and its connectivity with twelve Ge4+ ions. (b) View of the CGSe framework along the ab direction. (c, d) SEM images and the corresponding EDS mapping of (e) Cu, (f) Ge, and (g) S of CGSe. The high-magnification SEM image inset in Figure 2(c).
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