High Voltage Microsupercapacitors Fabricated and Assembled by Laser Carving
Shigen Bai, Yong Tang, Yaopeng Wu, Junbo Liu, Huilong Liu, Wei Yuan, Longsheng Lu, Wenjie Mai, Hui Li, Yingxi Xie
Abstract
Miniaturized and flexible power resources such as supercapacitors with resistance of high voltage play a critical role as potential energy storage devices for implantable and portable electronics because of their convenience, high power density, and long-term stability. Herein, we propose a novel strategy for the fabrication of high voltage microsupercapacitors (HVMSCs) employing porous laser-induced graphene (from polyimide films with alkalization treatment) followed by laser carving of the polyvinyl alcohol/H3PO4 gel electrolyte to realize a series assembly of supercapacitors and significantly increase the voltage resistance. The results elucidated that HVMSCs (3 mm × 21.15 mm) exhibited excellent capacitive performance including exceptional potential window (10 V), high areal capacitance (244 μF/cm2), acceptable power density (274 μW/cm2) and energy density (3.22 μW h/cm2), good electrochemical stability and flexibility at different bending status (0, 45, 90, 135, and 180°), as well as impressive voltage durability more than 5 V in smaller scale (0.5 mm × 5.5 mm). As such, the HVMSCs have great potential to be integrated with microcircuit modules for the next-generation self-powered systems and storage electronic devices in high voltage applications.