2024 | Keon-Woo Kim, Seong Ju Park, Su-Jeong Park, Inae Kim, Bomi Park, Se Hyun Kim, Unyong Jeong, Jin Kon Kim & Chanwoo Yang
This study presents a deformable micro-supercapacitor (MSC) fabricated using laser ablation patterning of graphene and eutectic gallium-indium (EGaIn) liquid metal. The MSCs are designed for soft electronics, offering high areal capacitance (1336 μF cm⁻²) with excellent rate performance and cycle stability (>10,000 cycles). The key innovation lies in the use of EGaIn as a current collector, which provides intrinsic liquid-phase characteristics, metallic conductivity, and self-healing properties. Graphene is integrated with EGaIn to form interdigitated electrodes, which are patterned via laser ablation. The laser ablation process selectively removes graphene and EGaIn while preserving the flexibility of the SEBS substrate. The MSCs demonstrate stable performance under various mechanical deformations, including stretching, folding, twisting, and wrinkling. The study also shows the integration of MSCs with commercial LEDs, demonstrating their potential as a deformable power source. The MSCs are fabricated using a SEBS substrate, with EGaIn coated via brushing and graphene selectively deposited via screen printing. Laser ablation is used to create interdigitated patterns, and an ion gel is coated to complete the MSCs. The MSCs are optimized for gap size and graphene loading to achieve high electrochemical performance. The study highlights the potential of laser ablation for fabricating high-performance, deformable energy storage devices. The results show that the MSCs maintain high capacitance even after repeated mechanical deformation, indicating their suitability for soft electronics. The study also explores the miniaturization of MSCs, demonstrating their feasibility for flexible and wearable applications. The MSCs are shown to operate stably under various mechanical deformations, including stretching, twisting, folding, and wrinkling. The study concludes that the combination of EGaIn and graphene, along with laser ablation, enables the fabrication of high-performance, deformable MSCs with excellent energy storage capabilities. The results demonstrate the potential of MSCs as a reliable power source for soft electronics.This study presents a deformable micro-supercapacitor (MSC) fabricated using laser ablation patterning of graphene and eutectic gallium-indium (EGaIn) liquid metal. The MSCs are designed for soft electronics, offering high areal capacitance (1336 μF cm⁻²) with excellent rate performance and cycle stability (>10,000 cycles). The key innovation lies in the use of EGaIn as a current collector, which provides intrinsic liquid-phase characteristics, metallic conductivity, and self-healing properties. Graphene is integrated with EGaIn to form interdigitated electrodes, which are patterned via laser ablation. The laser ablation process selectively removes graphene and EGaIn while preserving the flexibility of the SEBS substrate. The MSCs demonstrate stable performance under various mechanical deformations, including stretching, folding, twisting, and wrinkling. The study also shows the integration of MSCs with commercial LEDs, demonstrating their potential as a deformable power source. The MSCs are fabricated using a SEBS substrate, with EGaIn coated via brushing and graphene selectively deposited via screen printing. Laser ablation is used to create interdigitated patterns, and an ion gel is coated to complete the MSCs. The MSCs are optimized for gap size and graphene loading to achieve high electrochemical performance. The study highlights the potential of laser ablation for fabricating high-performance, deformable energy storage devices. The results show that the MSCs maintain high capacitance even after repeated mechanical deformation, indicating their suitability for soft electronics. The study also explores the miniaturization of MSCs, demonstrating their feasibility for flexible and wearable applications. The MSCs are shown to operate stably under various mechanical deformations, including stretching, twisting, folding, and wrinkling. The study concludes that the combination of EGaIn and graphene, along with laser ablation, enables the fabrication of high-performance, deformable MSCs with excellent energy storage capabilities. The results demonstrate the potential of MSCs as a reliable power source for soft electronics.