A seamlessly integrated device of micro-supercapacitor and wireless charging with ultrahigh energy density and capacitance

Abstract Microdevice integrating energy storage with wireless charging could create opportunities for electronics design, such as moveable charging. Herein, we report seamlessly integrated micro-supercapacitors by taking advantage of a designed highly consistent material system that both coils and electrodes are the graphite paper. The transferring power efficiency is 52.8%. Benefitting from unique circuit structure, intact device displays low resistance excellent voltage tolerability capacitance 454.1 mF cm ?2 , superior to state-of-the-art conventional planar micro-supercapacitors. Besides, record high density 463.1 ?Wh exceeds existing metal ion hybrid even commercial thin film battery (350 ). After 6 min, reaches up output 45.9 mW, which can drive an electrical toy car immediately. This work brings insight contactless micro-electronics flexible micro-robotics.