Waiting hours for a cellphone to charge may become a thing of the
past, thanks to an 18-year-old high-school student's invention. She won a
$50,000 prize Friday at an international science fair for creating an
energy storage device that can be fully juiced in 20 to 30 seconds.
The
fast-charging device is a so-called supercapacitor, a gizmo that can
pack a lot of energy into a tiny space, charges quickly and holds its
charge for a long time.
What's more, it can last for 10,000
charge-recharge cycles, compared with 1,000 cycles for conventional
rechargeable batteries, according to Eesha Khare of Saratoga, Calif.
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