article_snippet.sent: And while the dangers of overheating lithium ion (Li-ion) batteries have been known for some time, researchers have now revealed exactly what happens inside the 'burning' cells.
article_snippet.sent: Researchers subjected Lithium-ion batteries to heat and used thermal imaging and non-invasive high speed imaging techniques to observe changes in Researchers internal structure.
article_snippet.sent: The footage is the first time the failure of Li-ion batteries due to overheating has been recorded.
article_snippet.sent: Li-ion batteries are vulnerable to a condition known as thermal runaway, which occurs when the rate of heat generation is greater than the rate of heat lost.
article_snippet.sent: Although battery failure is rare, prevention of thermal runaway presents one of the greatest challenges for the safe operation of lithium-ion batteries.
article_snippet.sent: Dr Shearing and his colleagues subjected two commercial Li-ion batteries, known as Cell 1 and Cell 2, to external heat.
article_snippet.sent: Li-ion batteries are vulnerable to a condition known as thermal runaway, which occurs when the rate of heat generation is greater than the rate of heat lost.
article_snippet.sent: A Li-ion battery before being subjected to high temperatures is shown left, the same battery after heat abuse is shown right .
article_snippet.sent: Li-ion batteries have been known to overheat and are vulnerable to thermal runaway.
article_snippet.sent: The authors hope The authors observations will lead to improvements in the design of Li-ion batteries and improve The authors safety features.
highlights_snippet.sent: Researchers subjected two Lithium-ion batteries to external heat .
  