▎ 摘　　要

High energy density, durability, and flexibility of supercapacitors are required urgently for the next generation of wearable and portable electronic devices. Herein, a novel strategy is introduced to boost the energy density of flexible soild-state supercapacitors via rational design of hierarchically graphene nano-composite (GNC) electrode material and employing an ionic liquid gel polymer electrolyte. The hierarchical graphene nanocomposite consisting of graphene and polyaniline-derived carbon is synthesized as an electrode material via a scalable process. The meso/microporous graphene nanocomposites exhibit a high specific capacitance of 176 F g(-1) at 0.5 A g-(1) in the ionic liquid 1-ethyl-3- methylimidazolium tetrafluoroborate (EMIBF4) with a wide voltage window of 3.5 V, good rate capability of 80.7% in the range of 0.5-10 A g(-1) and excellent stability over 10 000 cycles, which is attributed to the superior conductivity (7246 S m(-1)), and quite large specific surface area (2416 m(2) g(-1)) as well as hierarchical meso/micropores distribution of the electrode materials. Furthermore, flexible solid-state supercapacitor devices based on the GNC electrodes and gel polymer electrolyte film are assembled, which offer high specific capacitance of 180 F g(-1) at 1 A g(-1), large energy density of 75 Wh Kg(-1), and remarkable flexible performance under consecutive bending conditions.