Significant Performance Enhancement of Graphene Anode for Li-ion Batteries by Using CVD-Graphene-Film/Cu-Foil Composite Collectors

Abstract

For the first time, CVD-grown graphene film on Cu foil (G/Cu) was used as a composite collector of reduced graphene oxide (rGO) anode for lithium-ion batteries. Significant performance enhancement was observed for rGO anode with G/Cu composite collector: i) the first cycle discharge specific capacity of rGO anode with G/Cu composite is as large as 2947 mAh g-1, nearly twice of that (1509 mAh g-1) using conventional Cu foil collector; ii) rGO anode with G/Cu composite shows much better high-rate specific capacity even at 20 C. It suggests that it is promising for G/Cu composite collector to improve the performance of lithium ion batteries.