The Polymer Society of Korea

Abstract

Microsupercapacitors (MSCs) are promising candidates for flexible electronics, that require compact, high-power energy buffering. However, practical use is limited by electrodes requiring sophisticated procedures. To enable scalable, facile fabrication, we present a porous graphene composite on liquid crystal polymer (LCP) films via laser-induced graphene (LIG) patterning and in situ photothermal growth of bimetallic metal oxides from dispersed metal-salt precursors in the porous LIG matrix. The resulting oxide nanophases embedded in 3D LIG mitigate the low capacitance of pristine LIG while retaining mechanical compliance. The interdigitated MSC delivers ~527 mF cm⁻² areal capacitance and ~9.16 mW cm⁻² power density, surpassing previously reported laser-fabricated MSCs. Moreover, through-vias in ultrathin LCP enable vertical integration of tens of MSCs, achieving ~1260 μWh cm⁻² areal energy density while preserving a compact form factor.