Figure 5

Electrochemical performance of an all-graphene-battery composed of a functionalized graphene cathode and a reduced graphene oxide anode in a full cell system.

(a). Charge/discharge profiles at a current rate of 0.05 A g⁻¹_{cathode+anode}. Cycle stability of all-graphene-battery at a current rate of (b). 50 mA g⁻¹ and (c). 500 mA g⁻¹. (d). Charge/discharge profiles at various current rates from 50 mA g⁻¹ to 3,000 mA g⁻¹. (e). Ragone plot of all-graphene-battery that compares it to conventional Li batteries, supercapacitors and other high performance LICs based on the total weight of active materials (including both cathode and anode materials). (1) Symmetric supercapacitor³⁰ (2) LiMn₂O₄/graphite²⁹ (3) AC/G-Li₄Ti₅O₁₂³⁹ (4) ZHTP/Li₄Ti₅O₁₂⁴¹ (5) URGO/MG⁴² (6) Fe₃O₄-G//3Dgraphene⁴⁰.