Physicists have created a stretchable eight times supercapacitor

American physicists have developed elastic supercapacitor that can be stretched up to eight times, while remaining fully functional. It is resistant to repetitive sprains and grips, and loses only a few percent capacity after 10 thousand cycles of recharge. In the future, the super capacitor can be a power source for flexible electronic devices, write the scientists in the journal of the Matter.

According to its characteristics, supercapacitors are intermediate between standard capacitors and electric batteries. They can be charged and discharged much faster than batteries and have higher capacity than conventional capacitors. Therefore, actively using them to power devices that consume large amount of energy in a short time. Such devices include, for example, the camera flashes. The engineers did not forget about the ability of supercapacitors to very rapid charging. For example, a cordless screwdriver with an ultracapacitor instead of a battery recharged in just 90 seconds, while the battery version will last on a single charge twice as long.

Elastic supercapacitors — the main contenders for the role of power sources of flexible electronic devices. Scientists have learned to produce their films composed of carbon nanotubes (CNTS). Using films of direct CNT forests, the researchers created a supercapacitor with a capacitance of 100 f g-1 when stretched up to 30 percent of the original length. It turned out that much better behave supercapacitors with “crumpled” CNT (CNT crumpling), the capacity of which is twice higher than the previous options, but to stretch such a supercapacitor can be by as much as 800 percent. However, both options have their drawbacks. Supercapacitors with straight CNT forests fairly quickly crack when you try to stretch them, and “crumpled” CNT forests show a high resistance in extended condition.

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