High Voltage Microsupercapacitors Fabricated and Assembled by Laser Carving

作者：Bai, Shigen; Tang, Yong; Wu, Yaopeng; Liu, Junbo; Liu, Huilong; Yuan, Wei; Lu, Longsheng; Mai, Wenjie; Li, Hui; Xie, Yingxi^*

来源：ACS applied materials & interfaces, 2020, 12(40): 45541-45548.

DOI：10.1021/acsami.0c11935

• high voltage micro-supercapacitors
• laser-induced graphene
• flexible
• energy storage
• higil-voltage electronic devices

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 x 21.15 mm) exhibited excellent capacitive performance including exceptional potential window (10 V), high areal capacitance (244 mu F/cm(2)), acceptable power density (274 mu W/cm(2)) and energy density (3.22 mu W h/cm(2)), good electrochemical stability and flexibility at different bending status (0, 45, 90, 135, and 180 degrees), as well as impressive voltage durability more than 5 V in smaller scale (0.5 mm x 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.