▎ 摘　　要

The rapid development of wearable electronic devices has put forward higher requirements for compressible energy storage devices. Three-dimensional (3D) hierarchical porous structures have been verified to be an excellent force bearing structure, which is beneficial to disperse strain and stress, effectively improving stiffness and resilience. However, the development of a 3D hierarchical electrode with both excellent compressibility-resilience and a stable power output under deformation conditions is still facing significant challenges. Here, a 3D-printed ultralight and superelastic reduced graphene oxide manganese dioxide foam (3DP-rGO-MnO2) is proposed to construct high-performance compressible supercapacitors via a simple in situ chemical reaction with a uniform loading of MnO2 on the printed rGO foam substrate. The rGO foam with a 3D hierarchical porous structure formed by 3D-printed regular macroscopic pores and freeze-drying-incorporated cellular microscopic pores can not only provide sufficient stress relief space for large mechanical deformation and ensure fast ion/electron transfer kinetics but also provide abundant active sites for MnO2 loading, effectively solving the issues of poor conductivity and volume expansion of MnO2 during charging and discharging. As a result, the constructed symmetrical supercapacitor exhibits excellent and long cycling stability (90.4% after 20,000 cycles) and a competitive energy/power density (18.4 W h/kg, 9000 W/kg). Meanwhile, the compressible devices can deliver a stable capacitance output under different compressive deformation from 0 to 90% and notably retain 93.9% capacity even under an ultimate compressive strain of 90%. This work provides a promising avenue for designing high-performance compressible energy storage devices.