Garment-Integrated Microsupercapacitors to Power Wearable Electronics

Their new method uses a micro-supercapacitor and combines vapor-coated conductive threads with a polymer film, plus a special sewing technique to create a flexible mesh of aligned electrodes on a textile backing. The resulting solid-state device has a high ability to store charge for its size, and other characteristics that allow it to power wearable biosensors.

Andrew adds that while researchers have remarkably miniaturized many different electronic circuit components, until now the same could not be said for charge-storing devices. “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.” Details appear online in ACS Applied Materials & Interfaces.

Andrew and postdoctoral researcher and first author Lushuai Zhang, plus chemical engineering graduate student Wesley Viola, point out that supercapacitors are ideal candidates for wearable charge storage circuits because they have inherently higher power densities compared to batteries.

But “incorporating electrochemically active materials with high electrical conductivities and rapid ion transport into textiles is challenging,” they add. Andrew and colleagues show that their vapor coating process creates porous conducting polymer films on densely-twisted yarns, which can be easily swelled with electrolyte ions and maintain high charge storage capacity per unit length as compared to prior work with dyed or extruded fibers.

Andrew, who directs the Wearable Electronics Lab at UMass Amherst, notes that textile scientists have tended not to use vapor deposition because of technical difficulties and high costs, but more recently, research has shown that the technology can be scaled up and remain cost-effective.

She and her team are currently working with others at the UMass Amherst Institute for Applied Life Sciences’ Personalized Health Monitoring Center on incorporating the new embroidered charge-storage arrays with e-textile sensors and low-power microprocessors to build smart garments that can monitor a person’s gait and joint movements throughout a normal day.

Contacts and sources:
Trisha L. Andrew

Citation: High Energy Density, Super-Deformable, Garment-Integrated Microsupercapacitors for Powering Wearable Electronics Lushuai Zhang, Wesley Viola, and Trisha L. Andrew* Departments of Chemistry and Chemical Engineering, University of Massachusetts Amherst
CS Applied Materials & Interfaces journal article

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