Graphene/Au composite paper as flexible current collector to improve electrochemical performances of CFx cathode

• Graphene/Au composite paper was use as a current collector for CFx cathode.
• The rate performances of the CFx cathodes can be greatly improved.
• Maximum power density of 8000 W kg−1 at 5C rate can be achieved with CF1.0.
• Provide a new strategy to design both high power and energy densities CFx cathode.

We report the application of free-standing, lightweight, and flexible graphene/Au composite paper (GACP), as a current collector for CFx cathode. At a high discharge current density of 4000 mA g−1 (5C), the capacity of the CF1.0 loaded on GACP current collector is 653 mAh g−1, while CF1.0 loaded on Al foil failed at 800  mA g−1 (1C). Using GACP, both excellent rate capability and specific capacity can be achieved simultaneously, owing to its undulant surface structure and flexible contact with the CFx composite active layer. Our results provide a new strategy to design both high power and energy densities CFx cathode.