Ultrafast high-volumetric sodium storage of folded-graphene electrodes through surface-induced redox reactions

摘要: Abstract Post-Li-ion high-volumetric electrochemical energy storage devices have been believed as the next generation power sources for portable electronics and electrified vehicles. Sodium-ion capacitors (SICs) are competent sake of low cost high energy-power performance. The most promising positive electrodes SICs functionalized carbon that enable surface-induced redox reactions sodium cations exclude performance degradation caused by insertion/extraction. However, surface charge cannot realize storage. In this work, we demonstrate first time folded-graphene via three-dimensional densification candidates high-density process. delivered record volumetric capacity 132 mA h/cm3 at 0.05 A/g. Even a 100-times higher current density (5 A/g), still preserved 72 mA h/cm3 indicating great potential pulse output. Moreover, demonstrated long-term stability over 1600 cycles with only 0.01% decay in per cycle. concept using 3D can be readily extended to Mg-/Li-ion indicates new avenue towards compact