Medical Design Briefs - December 2022 - 26

by the study's co-authors Robert Shepherd,
associate professor in the Sibley
School, and Emmanuel Giannelis, the
Walter R. Read Professor of Engineering
in the department of materials science
and engineering.
The study's authors are continuing to
research the material and the molecular
processes behind its synthesis. Bonassar
says the material is well suited for
the type of bioprinting pioneered in his
lab, and the authors have begun experimenting
with using it as a 3D printing
material.
This article was written by Syl Kacapyr,
Cornell University. For more information,
visit https://news.cornell.edu. Contact: Dr.
Lawrence Bonassar, lb244@cornell.edu.
Stretchable Battery Packaging Could Power the Future of
Wearable Devices
The packaging film offers
high gas and moisture
barrier functionality.
Yokohama National University
Yokohama, Japan
Wearable devices have garnered attention
for their potential as sensors
that could monitor various biomarkers,
a means of drug delivery, medical devices,
and more. In order for these wearable
devices to be functional and practical,
they need to have batteries that are
stretchable and
highly deformable.
While there has been research on how
to improve battery flexibility while
maintaining battery life and other desirable
properties, less attention has been
paid to the importance of how to protect
batteries from moisture and gases.
Because wearable devices are exposed
to the atmosphere, it is important to extend
battery life while protecting the
batteries from 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, bringing closer the possibility
of wearable devices with highly deformable
batteries as a common technology.
" Currently, the use of solid and large batteries
for stretchable devices is a problem
in stretchable electronics; that is, while sensors
and interfaces are soft, batteries still
use hard batteries, " says corresponding author
Hiroki Ota of the department of mechanical
engineering at Yokohama National
University. " Soft and stretchable batteries
have been studied but cannot be used in
air due to the high gas and moisture permeability
of the packaging materials of
stretchable batteries. "
To create a flexible film with a high gas
barrier, the researchers coated a thin layer
of liquid metal onto a gold-deposited
thermo plastic polyurethane film using the
layer-by-layer method. This method allowed
for the desired deformability, unlike
aluminum-laminated films, which were
used previously to address the issue of gas
and moisture permeability but failed to allow
for the needed flexibility.
According to the researchers, the resulting
film shows excellent oxygen gas impermeability
under mechanical strain and extremely
low moisture permeability. The
stretchable lithium-ion battery that they assembled
in their study operated reliably in
air thanks to the stretchable gas barrier
film that they developed.
" It is exciting that in addition to the
development of a stretchable battery,
which could be used in the next generation
of smart devices, including future
wearable devices, films with high gas and
moisture barrier properties can be
achieved by using a novel material called
liquid metal, " Ota says.
This research holds promise of being
able to use batteries that have high energy
density, high working voltage and
long-term stability and are also 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 says.
Next steps include enhancing the moisture
protection ability of the film by modifying
the materials. Another future direction
is improving the stability of the
performance of the batteries, even under
deformation, by developing materials better
suited for its parts. Making the film
cost-effective will also contribute to eventual
scalability.
The stretchable battery, packed in liquid metal, is strained by hands. Batteries can withstand stretching
of more than 50 percent. (Credit: Yokohama National University)
26
www.medicaldesignbriefs.com
" Further cost reductions of the developed
film will lead to the implementation
of stretchable batteries, " Ota says. " In addition,
the film could be useful as a barrier
film for organic electronics and so on. "
Other authors on the paper are Nyamjargal
Ochirkhuyag, Yuuki Nishitai, Satoru
Mizuguchi, Yuji Isano, Sijie Ni, Koki
Murakami, and Masaki Shimamura, all of
the department of mechanical engineering
at Yokohama National University; and
Hiroki Iida and Kazuhide Ueno of the department
of chemistry and life science at
Yokohama National University. Their results
were published in ACS Applied Materials
& Interfaces. JSPS KAKENHI, Pfizer
Health Research Foundation and JST
CREST partly supported this work.
For more information, visit www.ynu.
ac.jp. Contact: kenkyu-koho@ynu.ac.jp.
Medical Design Briefs, December 2022
https://news.cornell.edu http://www.ynu.ac.jp http://www.ynu.ac.jp http://www.medicaldesignbriefs.com

Medical Design Briefs - December 2022

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Medical Design Briefs - December 2022 - COV1A
Medical Design Briefs - December 2022 - COV1B
Medical Design Briefs - December 2022 - Cov1
Medical Design Briefs - December 2022 - Cov2
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