A Seamlessly Integrated Device of Micro-supercapacitor and Wireless Charging with Ultrahigh Energy Density and Capacitance

Abstract

Abstract Microdevice integrating energy storage with wireless charging could provide new opportunities for electronics design, such as moveable charging. Herein, we report a seamlessly integrated wireless charging micro-supercapacitors (IWC-MSCs) by taking advantage of a designed highly consistent material system that both wireless coil and electrode are of the graphite paper. The transferring power efficiency of the wireless charging is 52.8%. Benefitting from unique circuit structure, the intact IWC-MSCs displays low resistance and excellent voltage tolerability with a capacitance of 454.1 mF cm − 2 , superior to state-of-the-art conventional planar MSCs. Besides, a record high energy density of 567.6 µWh cm − 2 exceeds the existing metal ion hybrid MSCs and even commercial thin film batteries (350 µWh cm − 2 ). After charging for 6 minutes, the IWC-MSCs reaches up to a power output of 4.5 mW, which can drive an electrical toy car immediately. The specific electrode layout brings new insight for contactless micro-electronics and flexible micro-robotics.