Flexible micro-supercapacitor (MSC) has attracted widespread attention in the wearable field due to its high power density and long cycle life. The planar interdigitated flexible supercapacitor has become the most promising candidate for achieving high-performance flexible energy storage devices. In this study, activated carbon nanospheres and graphene layers were dispersed and prepared into printing ink, and the emerging aerosol jet printing technology was used to print micro-droplets generated by ultrasonic atomization on a PET substrate. By drop-casting PVA/H2SO4 gel electrolyte and encapsulating, an MSC with an interdigitated electrode morphology is manufactured. By controlling the behavior of droplets during the printing process, an activated carbon nanosphere-hybridized graphene 3D structure framework is constructed inside the electrode, enabling rapid ion diffusion within the electrode. The area of the single MSC electrode prepared by printing is only 0.08 cm², and it exhibits excellent flexible stability and electrochemical performance, with a high areal specific capacitance of 3.98 mF/cm²at a scan rate of 10 mV/s. Furthermore, the MSC also demonstrates stable cyclic charge-discharge capability, maintaining a capacitance retention rate of 99% after 15,000 cycles at a high current density of 0.98 mA/cm². Furthermore, the performance of this capacitor shows no significant changes after being stored for 2 months.
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