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Stretchable battery packaging with moisture and gas barrier could power the future of wearable devices

Stretchable battery packaging with moisture and gas barrier could power the future of wearable devices

Stretchable battery packaging with moisture and gas barrier could power the future of wearable devices

Stretchable battery packaging with moisture and gas barrier could power the future of wearable devices

The stretchable battery that is packed in liquid metal is hand-pulled. The battery can withstand a strain of more than 50%. credit: Yokohama National University

Wearable devices have attracted attention for their potential as sensors that can monitor various biomarkers, means of drug delivery, medical devices, and more. For these wearable devices to be functional and practical, they must have batteries that are stretchable and highly deformable.

While research has been done on how to improve battery flexibility while maintaining battery life and other desirable properties, less attention has been paid to the importance of protecting batteries from moisture and gases. That’s why wearable device are exposed to the atmosphere, it is important to expand battery life while protecting the battery atmospheric moisture And gases,

A team of researchers from Yokohama National University in Japan has developed a stretchable packaging film for these batteries with a high gas and moisture barrier functionality, which gives us the potential for wearable devices with highly deformable batteries as a general technology. brings closer.

their results. were published in ACS Applied Materials and Interfaces on 27 September.

“Currently, the use of solid and large batteries for stretchable devices is a problem Stretchable Electronics … while the sensors and interfaces are soft, the batteries still use hard batteries,” said corresponding author Hiroki Ota of the Department of Mechanical Engineering at Yokohama National University.

“Soft and stretchable batteries have been studied around the world, but cannot be used in air due to the high gas and moisture permeability of the packaging materials of stretchable batteries.”

to make it stretch film With a high gas barrier, the researchers coated a thin layer of liquid metal On gold deposited thermoplastic polyurethane film using layer-by-layer method. This method allowed for the desired deformation, in contrast to aluminium-laminated films, which were previously used to address the issue of gas and moisture permeability but failed to allow the required flexibility.

According to the researchers, the resulting film shows excellent oxygen gas impermeability under mechanical stress and extremely low moisture permeability. The stretchable lithium-ion battery they assembled in their study was able to operate reliably in air thanks to the stretchable gas barrier film they developed.

“It is exciting that in addition to the development of a stretchable battery that could be used in the next generation of smart devices, including wearable devices in the future, films with high gas and moisture barrier properties can be obtained using a novel material called liquid. metal,” Ota said.

This research promises to be able to use batteries that have high energy density, high working voltage and long-term stability and that are highly deformable as opposed to bulky and inflexible in wearable devices. As a result, the findings bring wearable devices closer to becoming more practical, which opens up opportunities in medicine and health as well as other fields.

“This research contributes to the social implementation of stretchable devices,” Ota said.

The next steps include increasing damp The film’s protection ability by modifying the material. Another future direction is improving the stability of battery performance, even under deformation, by developing better suited materials for its parts. Making the film cost-effective will also contribute to the ultimate scalability.

“Further reduction in the cost of the developed film will lead to the implementation of stretchable batteries,” Ota said. “In addition, the film may be useful as a barrier film for biological electronics, etc.”


Development of a stretchable and printable free-form lithium-ion battery


more information:
Nyamjargal Ochirkhuyag et al, Highly deformable battery side using liquid metal as stretchable gas barrier films, ACS Applied Materials and Interfaces (2022). DOI: 10.1021/acsami.2c13023

Provided by Yokohama National University

Citation: Stretchable battery packaging with moisture and gas barrier could power the future of wearable devices (2022, October 31) 31 October 2022 at https://techxplore.com/news/2022-10-stretchable-battery-packaging- Retrieved from moisture-gas .html

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