Assessing the Safety Of Lithium-Ion Batteries

From C&EN:

Lithium-ion batteries are back in the crosshairs after two safety incidents aboard Boeing 787 Dreamliner airplanes in January. Headlines everywhere drew readers to stories about flaming and smoldering batteries. Reports warned of these popular power packs' tendency to overheat and burst into flames. Broadcasts pointed out that fires in portable electronic devices several years ago prompted manufacturers to recall millions of Li-ion laptop batteries.

But these batteries are statistically very reliable. "There's a lot of mythology in the area of lithium-ion battery safety," says Brian M. Barnett, a battery safety specialist at Lexington, Mass.-based technology development firm Tiax. Failure rates for rechargeable Li-ion batteries are on the order of one in 10 million cells, he says. "That's not a reliability problem. It's an exception."

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