Researchers in South Korea have developed an innovative lithium-metal battery that automatically shuts down in the event of overheating, reducing the risk of fire in electric vehicles.
Based at the Daegu Gyeongbuk Institute of Science and Technology (DGIST) in South Korea, these researchers have developed a battery incorporating a triple-layer solid polymer electrolyte. This design prevents lithium growth, which can lead to short-circuits and fires.
The electrolyte is also enriched with decabromodiphenyl ethane (DBDPE), an extinguishing agent. This means that, in the event of overheating, this component theoretically enables the battery to extinguish itself, thus preventing fires from breaking out.
But that's not all: beyond its enhanced safety, the battery is said to retain 87.9% of its initial capacity after 1,000 charge cycles, testifying to its remarkable longevity. In comparison, conventional batteries generally maintain between 70% and 80% of their performance in the same circumstances.
Such a breakthrough could revolutionise the electric vehicle sector, with batteries that are both safer and more long-lasting. Fires caused by exploding batteries are a real problem, especially in South Korea.
Following a series of as yet unexplained fires, the authorities recently called for greater transparency from automakers regarding the batteries used in the country's electric cars.
At issue are lithium-ion batteries of the NMC type (ie, containing nickel, manganese and cobalt). These batteries are now used by a large number of vehicle manufacturers, notably in China.
In China, the industry is already working on a new generation of solid-state batteries, which are both more efficient and safer. This is the case of the SAIC group, via its MG brand.
In terms of safety, the absence of liquid electrolyte considerably reduces the risk of short-circuiting, and consequently of fire. – AFP Relaxnews
