All nanocarbon Li-Ion capacitor with high energy and high power density

An energy storage device reaching energy densities of 102 Wh/Kg at power densities of 104 W/Kg would mean the possibility of charging such a device in 36 s. The nanocarbon device presented here is closer to that feat than any previously reported system. N-doped Carbon Nanopipes were used as anode and Partially Reduced Graphene Oxide as cathode, with LiPF6 EC/PC electrolyte. This system yields simultaneously high energy and power densities (262 at 450 W/kg and 78 Wh/kg at 9000 W/kg) which are energy/power combinations considerably higher than those of present Li-ion batteries. Our cell exhibits excellent cycle stability (similar to 91% capacity retention after 4000 cycles 0.01-4 V). These breakthrough results are based on the kinetic balancing of the nanocarbon electrodes, which can deliver excellent high energy density at high rates and low costs. (C) 2018 Elsevier Ltd. All rights reserved.