The researchers report that the capacitance of the device is surprisingly and reproducibly recoverable: After the first 4000 cycles, 71% of the initial capacitance is retained, and it recovered to 93% after a 12-hour no-operation period. After another 4000 cycles, the capacitance again shows a 71% capacitance retention, which recovers to 93% after another 12-hour rest period. They speculate that one possible reason for this behavior is the redistribution of unbalanced charges in the solid-state device during the rest period.
The team noted that “incorporating electrochemically active materials with high electrical conductivities and rapid ion transport into textiles is challenging. With this paper, we show that we can literally embroider a charge-storing pattern onto any garment using the vapor-coated threads that our lab makes. This opens the door for simply sewing circuits on self-powered smart garments.”
Their detailed research paper “High Energy Density, Super-Deformable, Garment-Integrated Microsupercapacitors for Powering Wearable Electronics” was published in the Applied Materials Interfaces journal of the American Chemical Society, and the project was supported by the David and Lucille Packard Foundation.
This article was first published in Electronic Design - www.electronicdesign.com