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

• Published in: Nature communications Vol. 12; no. 1; p. 2647
• Main Authors: Gao, Chang, Huang, Jiancheng, Xiao, Yukun, Zhang, Guoqiang, Dai, Chunlong, Li, Zengling, Zhao, Yang, Jiang, Lan, Qu, Liangti
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 11-05-2021; Nature Publishing Group; Nature Portfolio
• Subjects: 639/301/299/161; 639/4077/4079/4105; 639/925/357/551; Capacitance; Circuits; Coils; Electronics; Energy storage; Flux density; Humanities and Social Sciences; Low resistance; Metal ions; multidisciplinary; Power efficiency; Power management; Robotics; Science; Science (multidisciplinary); Supercapacitors; Thin films; Wireless power transmission
• ISSN: 2041-1723; 2041-1723
• DOI: 10.1038/s41467-021-22912-8

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