fig2
![Constructing three-dimensional architectures to design advanced anodes materials for sodium-ion batteries: from nanoscale to microscale](https://image.oaes.cc/3d9040ff-fca5-469a-bb18-aacb7645bea9/em4063.fig.2.jpg)
Figure 2. (A) TEM, (B) HR-TEM images, and (C) cycling performance of hollow carbon nanospheres. (D) Schemes of the electrochemical reaction process and (E) rate performance of hollow carbon nanospheres and carbon nanospheres electrode[66]. (F) SEM and (G) TEM images and (H) cycling performance of hollow carbon spheres[68].