The Effects of Power LevelsTime Periods for Sputtering Cobalt onto Carbon NanotubesGraphene Composites and Cobalt Annealed on the Characteristics of Anode Materials for Lithium-Ion Batteries

Abstract EN

Carbon nanotubes/graphene composites are directly grown on nickel foil without additional catalysts by chemical vapor deposition (CVD).

Next, the cobalt is deposited on carbon nanotubes/graphene composites by radio frequency (RF) sputtering with different power levels and time periods.

Then, the cobalt is transformed into cobalt oxide by annealing.

A longer time period of sputtering leads to higher specific capacity.

Furthermore, the electrochemical stability of cobalt oxide/carbon nanotubes/graphene composites is higher than that of cobalt oxide.