High energy density and extremely stable supercapacitors based on carbon aerogels with 100% capacitance retention up to 65,000 cycles
Yu Ma, Ding Chen, Zhi Fang, Yapeng Zheng, Weijun Li, Shang Xu, Xianlu Lu, Gang Shao, Qiao Liu, Weiyou Yang
Abstract
Significance This work explores carbon aerogels with a three-dimensional interconnected nanofiber network and rationally designed hierarchical porous structures, which endow the supercapacitors (SCs) with both high energy density and long-term stability, with the goal of practical application. The as-constructed SCs have a high specific capacitance of 297 F ⋅ g –1 at 1 A ⋅ g –1 and remarkable energy density of 14.83 Wh ⋅ kg −1 at 0.60 kW ⋅ kg −1 , both of which are much higher than those of most carbon-based SCs. Significantly, they have an extremely high stability, with capacitance retention of 100% over 65,000 cycles, the best among carbon-based SCs.