Researchers at the University of British Columbia have developed the world’s first washable stretchable battery. It can power smart clothing for athletes. There are more and more clothes on the market equipped with smart sensors that measure the body’s work. So the need arises to create power systems for them that are not only functional but also safe. Batteries that power such technological novelties now, for the time of washing should be removed, because they do not tolerate moisture very well. However, this will soon not be necessary. Its creation was not easy and required overcoming several obstacles. Instead of creating a lithium-ion battery filled with hardened materials inside a rigid case, they used zinc and manganese dioxide. This method is attractive because of its low cost and safety.
The materials were first ground into small pieces and then embedded in polymer to create ultra-thin and stretchable layers. Several were also stacked and encapsulated in the same polymer to seal the finished product. The result is a flexible battery that can be stretched to twice its length. It has a capacity of 160 mAh and retains 75% of its original capacity for 500 charge and discharge cycles. The seal provides the battery with excellent protection against moisture. During testing, the battery has so far lasted 39 wash cycles. The team is currently working on improving power output and battery life. Researchers say the expected cost of such a battery will be similar to a standard battery. According to them, the technology can be used in watches and patches that measure vital signs and in smart clothing that perform the same task.
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