TEEN'S INVENTION COULD CHARGE YOUR PHONE IN 20 SECONDS

Waiting hours for a
cellphoneto charge may
become a thingof 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
ofenergy into a tiny
space, charges quickly
and holds itscharge 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.
"My cellphone battery
always dies," she told
NBC News when asked
what inspired her to
work on the energy-
storage technology.
Supercapacitors also
allowed her to focus on
her interest in
nanochemistry —"really
working at the
nanoscale to make
significantadvances in
many different fields."
To date, she has used
the supercapacitor to
power a light-emitting
diode, or LED. The
invention's future is
even brighter. She sees
it fitting inside
cellphones and the other
portable electronic
devices that are
proliferatingin today's
world, freeing people
and their gadgets for a
longer time from
reliance onelectrical
outlets.
"It is also flexible, so it
can be used in rollup
displays and clothing
and fabric," Khare added.
"It has a lot of different
applications and
advantages over
batteries inthat sense."

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