Abstract
Manufacturing electrode films at an industrial-level submillimeter thickness (~ 100 µm) with superior volumetric performance is of practical significance for the commercialization of miniaturized supercapacitor systems. Herein, we propose a commercially scalable solvated-ion-intercalated hydrothermal strategy to demonstrate a recorded-high volumetric capacitance (511.29 F cm− 3) for supercapacitors based on industrial-level submillimeter MoS2 film electrode (94.2 µm). The intercalated solvated-Li+ ions increase the amount of negative surface charges and reduce the formation energy of 1T MoS2, leading to a high metallic phase purity of 82.7% with enhanced electrical conductivity. Together with the expanded interlayer distance (~ 1.23 nm), this allows rapid electron transfer and ion transport in the excessively-stacked ultrathick MoS2 film to be simultaneously realized. Thus, the as-fabricated MoS2||activated carbon asymmetric supercapacitor presents both high energy and power densities, outperformed those of commercial devices, including supercapacitors with submillimeter-thick electrodes and even micrometer-thick electrodes.
High-volumetric capacitance and high-rate performance in liquid-mediated densified holey MXene film