Enlarging ion-transfer micropore channels of hierarchical carbon nanocages for ultrahigh energy and power densities

Increasing the energy density of supercapacitor without sacrificing its high power is an everlasting pursuit in storage. Using ionic liquid electrolyte with operating voltage can increase but usually at expense due to large ion size, low conductivity and viscosity. Herein we demonstrate a simultaneous densities (EMIMBF4) mainly by enlarging ion-transfer micropore channels electrode material, i.e., unique hierarchical carbon nanocages (hCNC). Boudouard reaction adopted tune size while remaining framework hCNC. Meanwhile, specific surface area, pore volume are also increased under optimal activation temperature. Such modification boosts large-sized transfer, leading obvious decrease equivalent series resistance dramatic supercapacitive performance thereof. The optimized product exhibits up 153.8 W h kg?1 1.8 kW kg?1, maintains 54.0 even ultrahigh 480.1 kg?1. This study demonstrates effective way explore advanced materials fine regulation micropores related properties.