Effects of Alumina Films on N-Doped Carbon Nanotubes/Graphene Composites as Anode Materials of Lithium-Ion Batteries

Figure 8

The FESEM images of Al₂O₃/N-doped CNTs/graphene with the power level (65 W) and different time periods (a) 10 min, (b) 30 min, and (c) 50 min for sputtering Al₂O₃ onto N-doped CNTs/graphene composites.

(a)

(b)

(c)