Ultra-foldable integrated high-performance in-plane micro-supercapacitors from laser-induced selective metallization

• Preparation of metal interdigitated electrodes by laser-induced selective metallization. • Metal current collectors exhibit high electrical conductivity and mechanical adhesion. • Electrodeposition of PPy active materials for all-solid-state flexible MSCs. • The fabricated flexible MSCs exhibit high volume energy and power density. The popularity of flexible and wearable electronic devices has stimulated the development of flexible energy storage devices, in which micro-supercapacitor (MSCs) are the most promising. Herein, we demonstrated a novel strategy for scalable fabrication of copper-nickel-polypyrrole (Cu-Ni-PPy) MSCs devices through laser-induced selective metallization of Cu interdigitated electrode combined with electroplating Ni and electrochemical deposition active material of PPy. The prepared Cu-Ni current collector exhibit high electrical conductivity and mechanical flexibility. Moreover, the obtained Cu-Ni-PPy MSCs devices display a large areal capacitance of 126.67 mF/cm 2 and a high volume energy density of 31.78 and 5.39 mWh/cm 3 at the corresponding power density of 0.15 and 7.5 W/cm 3 , respectively. Besides, the MSCs exhibit remarkable capacity retention of 94.8% after 10000 bending cycles and 89.3% after 10000 cycles. The wireless charging of the MSCs device can be realized by reasonably designing the wireless charging coil (WCO) for electromagnetic conversion. It's believed that this work provides insight into the manufacture of portability and flexibility of miniaturized energy storage devices.