S. KOREAN ENGINEERS FIND WAY TO MAKE SAFE LITHIUM BATTERY

Posted on: Mon, 16 Nov 2009 21:53:00 EST


Symbols: ERC
SEOUL, Nov 17, 2009 (AsiaPulse via COMTEX) --
ERC | Quote | Chart | News | PowerRating -- South Korean engineers have
developed a new technology for making safe rechargeable lithium
batteries used in cell phones, laptop computers and
electricity-driven cars, a state-run laboratory said Tuesday.

The Korea Atomic Energy Research Institute (KAERI) said its
engineers have come up with the technology for a new
"separator" that is resistant to external heat and impact. High
temperatures and weakness to impact have been cited for causing
fires and explosions in battery cells in the past.

A conventional rechargeable battery separator is made of
porous polyethylene that ordinarily facilitates the flow of
lithium ions generated by the positive side of a battery to the
negative side which creates electric power. It can also act as
an electric insulator if there is a problem in the battery
cell.

KAERI said the new separator, made by mixing polyethylene,
nano-alumina and flourine-based resin and subjecting this
compound to radiation, has effectively overcome weaknesses of
existing batteries.

"Tests showed that the new separator maintains its ability
to act as an electric insulator even if subject to heat of 150
degrees Celsius and considerable outside impact," a press
release by the laboratory said.

It added that normal polyethylene separators on the whole
lost their ability to act as insulators if subject to such
conditions.

The laboratory said it has applied for two separate
intellectual property rights patents for the new discovery.

South Korea uses 30 per cent of all lithium batteries made
in the world, with its domestic market expected to top 350
billion won (US$303 million) in 2010. The global market could
reach one trillion won next year.

(Yonhap) rw

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