"WASHINGTON — The National Transportation Safety Board indicated Thursday that an investigation into the failure of lithium-ion batteries aboard two Boeing 787 planes is still far from determining a cause ...

" “It is really very hard to tell at this point how long the investigation will take,” she said. “What I can tell you is we have all hands on deck. We are working hard to determine what the failure mode here is and what actions have to be taken.”

" “Lithium-ion” is a vague term that is used in the battery industry to describe a variety of chemistries. This particular battery was built specifically for the 787 and, according to the safety board on Thursday, used an aluminum strip coated in lithium cobalt oxide in its positive electrode. That is an older technology and is more prone to thermal runaway; it also generates oxygen as it heats, making combustion more likely."

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