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Home → Future

New stretchable battery is ideal for wearable electronics

The battery uses a solid polymer as the electrolyte and can provide a constant power output even when stretched to twice its original length.

Tibi Puiu by Tibi Puiu
January 25, 2020
in Future, News
Credit: Flickr, Robert Scoble.

Electronics have become increasingly mobile, following us everywhere into our daily lives. Today, it’s not only common for people to carry their notebooks and smartphones with them, but also have embedded electronics in their clothing and even on their skin.

However, wearable electronics currently face physical limitations because, traditionally speaking, silicon chips haven’t been designed to stretch like fabrics. The most limiting factor, though, is the battery, which can be challenging to make flexible — until now.

Writing in the journal Nature Communications, Stanford scientists have described a novel power source that can stretch and bend the way our bodies can.

The breakthrough was made by using polymers (plastic) in the battery. This isn’t a new idea, but previous setups that used polymers in lithium-ion batteries in the form of flowable gels caused leaks or even burst into flame.

To avoid this risk, Stanford chemical engineers Zhenan Bao and Yi Cui used a type of polymer that is both solid and stretchable rather than a gooey material that could potentially leak. The challenge lied in finding the right kind of plastic that could still transport electric charge effectively between the battery’s anode and cathode.

In one experiment, the researchers’ thumbnail-sized prototype maintained a constant power output despite being squeezed, folded, and stretched to nearly twice its original length. Its energy density, mass for mass, is about half that of a comparably sized non-stretchable battery.

In the future, the team wants to continue their research, looking to increase the energy density and demonstrate larger versions of the device outside the lab.

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Tags: lithium-ion batterystretchable

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