* : BBC * : admin * : 2016-10-04 * : 24
Researchers at Stanford University, California, say their new aluminium battery could end up witha safe and more
convenient energy source than the lithium models used in most mobiles and laptops.Stanford chemis-try professor,
Hongjie Dai, said the new device was a breakthrough.
Writing in Nature journal, he said: "We have developed a rechargeable aluminium battery thatmay replace existing
storage devices,such as alkaline batteries, which are bad for the environment,and lithium-ion batteries, which occa-
sionally burst into flames."Our new battery won't catch fire, even if you drill through it.
"Millions of consumers use 1.5-volt AA and AAA batteries. Our rechargeable aluminium batterygenerates about two
volts of electricity."That's higher than anyone has achieved with aluminium."The prototype battery was able to fully
charge more than 7,500 times without losing any capacity.
Previously, the most an aluminium battery could charge was 100 times, while a lithium batterylasts about 1,000 times
before it starts to lose power.
And the device has greater flexibility, meaning it can be used in phones and computers that can bebent and folded.
Current lithium batteries can burst into flames unexpectedly are banned as bulk shipments onsome airlines.However,
aluminium batteries will not spon-taneously combust, the researchers said.
next item: Laptops continue to shrink