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

Figure 9

The discharge-charge profiles (between 0.01 V and 3 V at 0.1 C) with different charge-discharge cycles of the coin cell for (a) the N-doped CNTs/graphene composite [2] and (b) Al₂O₃/N-doped CNTs/graphene (the best sputtering condition).

(a)

(b)