University of British Columbia researchers have created what could be the first battery that is both flexible and washable. It works even when twisted or stretched to twice its normal length, or after being tossed in the laundry.
"Wearable electronics are a big market and stretchable batteries are essential to their development," says Dr. Ngoc Tan Nguyen (he/him), a postdoctoral fellow at UBC's faculty of applied science. "However, up until now, stretchable batteries have not been washable. This is a critical addition if they are to withstand the demands of everyday use."
The battery developed by Dr. Nguyen and his colleagues offers a number of engineering advances. In normal batteries, the internal layers are hard materials encased in a rigid exterior. The UBC team made the key compounds—in this case, zinc and manganese dioxide—stretchable by grinding them into small pieces and then embedding them in a rubbery plastic, or polymer. The battery comprises several ultra-thin layers of these polymers wrapped inside a casing of the same polymer. This construction creates an airtight, waterproof seal that ensures the integrity of the battery through repeated use. For further information see the IDTechEx report on Flexible, Printed and Thin Film Batteries 2020-2030: Technologies, Markets and Players.
It was team member Bahar Iranpour, a PhD student, who suggested throwing the battery in the wash to test its seal. So far, the battery has withstood 39 wash cycles and the team...
Read Full Story: https://www.printedelectronicsworld.com/articles/25469/stretchy-washable-battery-brings-wearable-devices-closer-to-reality
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