Direct Graphene‐Carbon Nanotube Composite Ink Writing All‐Solid‐State Flexible Microsupercapacitors with High Areal Energy Density

Abstract

The advancement of miniaturized electronic devices requires the development of high-performance microsupercapacitors. The low areal energy density of microsupercapacitors with the interdigitated architecture is the major challenge hindering the application. Here, a simple method for the scalable fabrication of all-solid-state, flexible microsupercapacitors is demonstrated by direct graphene-carbon nanotube composite ink writing technology. The microsupercapacitors demonstrate good electrochemical performance with a high areal energy density of 1.36 µWh cm -2 and power density of 0.25 mW cm -2 , good cycling stability, and excellent mechanical flexibility. The method developed here sheds light on the simple method of preparing high-performance, all-solid-state, flexible microsupercapacitors in a straightforward and scalable process.

Engineered Electrode Structure for High‐Performance 3D‐Printed All‐Solid‐State Flexible Microsupercapacitors

“…Figure 3l and Figure S23, Supporting Information, show the Ragone plot, in which the energy-storage ability of GC-10-3 compared with other reported carbon-based MSCs is demonstrated. [2,37,[49][50][51][52][53][54][55][56][57][58] GC-10-3 has a high energy density of 2.49 μWh cm À2 and a high power density of 0.25 mW cm À2 , which is much higher than most recently reported carbon-based MSCs, especially considering the precondition of current collector free in GC-10-3 (Table S1, Supporting Information). The linear relationship between the current and scan rate for GC-10-1.…”

Solution‐Processed All‐V2O5 Battery

“…The graphene ink was prepared by the modified method as previously reported. [49][50][51] 20 mg of graphene was dispersed into 20 mL of EC/ethanol solution (1 mg mL −1 ; EC: M70, Sinopharm Chemical Reagent Co., Ltd.) by probe sonication (Scientz-750F) at power of 150 W for 10 min in an ice water bath. 1 mL of terpineol (AR, Guangzhou Jinhuada Chemical Reagent Co., Ltd.) was added into the dispersion, followed by a further sonication for 20 min.…”

Recent developments of advanced micro-supercapacitors: design, fabrication and applications

“…To solve this problem, introduction of guest materials as spacers is proved to be feasible to prevent the stacking of 2D carbon materials. For example, Wang et al 93 mixed graphene with CNTs to fabricate flexible MSCs. Owing to the presence of CNTs preventing the stacking of graphene (Fig.…”