A Novel Open-Framework Cu-Ge-Based Chalcogenide Anode Material for Sodium-Ion Battery

Figure 2

(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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