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

Chang Gao,Chunlong Dai,Yukun Xiao,Jiancheng Huang,Yang Zhao,Liangti Qu,Lan Jiang,Guoqiang Zhang,Zengling Li

doi:10.1038/s41467-021-22912-8

Chang Gao, Chunlong Dai + Show 7 more

Open Access

https://doi.org/10.1038/s41467-021-22912-8

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Abstract

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.

Highlights

Microdevice integrating energy storage with wireless charging could create opportunities for electronics design, such as moveable charging
It is worth noting that the wireless charging capability of the system is one of the critical factors that affect the overall energy of the microdevices, which strongly depends on the structure and electrical conductivity of coils inducing electromagnetic energy
We propose a kind of seamlessly integrated wireless charging MSCs (IWC-MSCs) by taking advantage of a designed high-consistent material system that wireless coils and electrodes are of the same material origin

Summary

Introduction

Microdevice integrating energy storage with wireless charging could create opportunities for electronics design, such as moveable charging. It still needs to find efficient connection ways for the energy storage microdevices and routine power supply equipment to complete the charging process, which runs counter to the original intention and future development of microdevices. To this end, replacing traditional electric supply mode with contactless charging can enhance the practicality of the energy storage microdevices in micro-drones, micro-electric vehicles, and microdetective systems by eliminating the cumbersome circuit external connecting procedure. The engineering realization of a high-performance metal-free coil in wireless charging micro-devices is hindered by the existing material systems due to the dearth of effective structural design and assembly protocols. Except for the reduction of integrity and flexibility, the energy output is prone to be affected, not to mention acquiring possible breakthroughs in the high-capacity of wireless charging microdevices[22,23]

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