An Energy-Adjustable, Deformable, and Packable Wireless Charging Fiber Supercapacitor.

Area of Science:

• Materials Science
• Energy Storage
• Wearable Electronics

Background:

• Traditional wireless charging energy storage devices for wearables are limited by rigid shapes and fixed charging parameters.
• These limitations restrict their application in space-constrained portable electronics.

Purpose of the Study:

• To develop a novel all-carbon fiber supercapacitor with shape-adjustable, packable, and energy-controllable wireless charging capabilities.
• To overcome the limitations of existing energy storage solutions for wearable electronics.

Main Methods:

• Fabrication of an all-carbon fiber supercapacitor with a unique one-dimensional circuit structure.
• Integration of wireless charging functionality with shape-adjustability and energy control.

Main Results:

• Achieved a maximum energy transfer efficiency of ≈60.8% from wireless charging to the fiber supercapacitor.
• Demonstrated superior area capacity (803 mF cm^-2) and energy density (1004 µWh cm^-2).
• Device exhibits significant shape deformability (2-20 cm diameter circles) and packability for applications like smart bracelets and GPS devices.

Conclusions:

• The developed fiber supercapacitor offers unprecedented opportunities for packable, space-confined wearable electronics.
• Adjustable wireless charging parameters (0.5-20 mA, 1.4-15.5 V, 0.003-313 mW) accommodate diverse micro-electronic energy needs.
• This innovation enables controllable energy harvesting for advanced wearable applications.