Page 7 - IAV Digital Magazine #401

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Scientists Accidentally Create Batteries That Last a Lifetime
RESEARCHERS AT the University of California at Irvine (UCI) have acci- dentally - yes, acciden- tally - discovered a nanowire-based technol- ogy that could lead to batteries that can be charged hundreds of thousands of times.
Mya Le Thai, a PhD can- didate at the university, explained in a paper published this week that she and her colleagues used nanowires, a mate- rial that is several thou- sand times thinner than a human hair, extremely conductive and has a surface area large enough to support the storage and transfer of electrons.
Nanowires are extremely fragile and don't usually hold up well to repeated discharging and recharg- ing, or cycling. They expand and grow brittle in a typical lithium-ion battery, but Le Thai’s team fixed this by coat- ing a gold nanowire in a manganese dioxide shell and then placing it in a Plexiglas-like gel to improve its reliability. All by accident.
The break- through could lead to laptop, smartphone and tablet batteries that last for- ever. Reginald Penner, chairman of UCI's chem- istry depart- ment, said: "Mya was playing around and she coated this whole thing with a very thin gel layer and started to cycle it. "She discov- ered that just by using this gel she could cycle it hundreds of thousands of times without losing any capacity. That was crazy, because these things typically die in dramatic fashion after 5,000 or 6,000 or 7,000 cycles at most."
The battery-like structure was tested more than 200,000 times over a
three-month span, and the researchers reported no loss of capacity or power. "The coated electrode holds its shape much better, making it a more reliable option," Thai said. "This research proves that a nanowire- based battery electrode can have a long lifetime and that we can make these kinds of batteries a reality."
The breakthrough also paves the way for com- mercial batteries that could last a lifetime in appliances, cars and spacecraft.
British fuel-cell maker Intelligent Energy Holdings announced ear- lier this year that it is working on a smartphone battery that will need to be charged only once a week.
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