A phone that charges in seconds? Scientists bring it closer to reality

November 21, 2016, University of Central Florida
A thin, flexible supercapacitor developed at the University of Central Florida boasts high energy and power densities. Credit: University of Central Florida

A team of UCF scientists has developed a new process for creating flexible supercapacitors that can store more energy and be recharged more than 30,000 times without degrading.

The novel method from the University of Central Florida's NanoScience Technology Center could eventually revolutionize technology as varied as mobile phones and electric vehicles.

"If they were to replace the batteries with these supercapacitors, you could charge your mobile phone in a few seconds and you wouldn't need to charge it again for over a week," said Nitin Choudhary, a postdoctoral associate who conducted much of the research published recently in the academic journal ACS Nano.

Anyone with a smartphone knows the problem: After 18 months or so, it holds a charge for less and less time as the battery begins to degrade.

Scientists have been studying the use of nanomaterials to improve supercapacitors that could enhance or even replace batteries in electronic devices. It's a stubborn problem, because a supercapacitor that held as much energy as a lithium-ion battery would have to be much, much larger.

The team at UCF has experimented with applying newly discovered two-dimensional materials only a few atoms thick to supercapacitors. Other researchers have also tried formulations with graphene and other two-dimensional materials, but with limited success.

"There have been problems in the way people incorporate these two-dimensional materials into the existing systems - that's been a bottleneck in the field. We developed a simple chemical synthesis approach so we can very nicely integrate the existing materials with the two-dimensional materials," said principal investigator Yeonwoong "Eric" Jung, an assistant professor with joint appointments to the NanoScience Technology Center and the Materials Science & Engineering Department.

Jung's team has developed supercapacitors composed of millions of nanometer-thick wires coated with shells of two-dimensional materials. A highly conductive core facilitates fast electron transfer for fast charging and discharging. And uniformly coated shells of two-dimensional materials yield high energy and power densities.

Illustration represents the novel design of the supercapacitor developed at the University of Central Florida. Credit: University of Central Florida

Scientists already knew two-dimensional materials held great promise for energy storage applications. But until the UCF-developed process for integrating those materials, there was no way to realize that potential, Jung said.

"For small , our materials are surpassing the conventional ones worldwide in terms of energy density, power density and cyclic stability," Choudhary said.

Cyclic stability defines how many times it can be charged, drained and recharged before beginning to degrade. For example, a can be recharged fewer than 1,500 times without significant failure. Recent formulations of with can be recharged a few thousand times.

By comparison, the new process created at UCF yields a supercapacitor that doesn't degrade even after it's been recharged 30,000 times.

Jung is working with UCF's Office of Technology Transfer to patent the new process.

Supercapacitors that use the new could be used in phones and other electronic gadgets, and that could benefit from sudden bursts of power and speed. And because they're flexible, it could mean a significant advancement in wearable tech, as well.

"It's not ready for commercialization," Jung said. "But this is a proof-of-concept demonstration, and our studies show there are very high impacts for many technologies."

In addition to Choudhary and Jung, the research team included Chao Li, Julian Moore and Associate Professor Jayan Thomas, all of the UCF NanoScience Technology Center; and Hee-Suk Chung of Korea Basic Science Institute in Jeonju, South Korea.

Explore further: Fast-charging everlasting battery power from graphene

More information: Nitin Choudhary et al, High-Performance One-Body Core/Shell Nanowire Supercapacitor Enabled by Conformal Growth of Capacitive 2D WSLayers, ACS Nano (2016). DOI: 10.1021/acsnano.6b06111

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5 / 5 (2) Nov 22, 2016
wow, if they don't oversell it, this sounds as the next big thing.... they tackled 3 out of the 5 requirements imo, power density, life cycle, charge/discharge speed but they didn't give insights on scalability and manufacturing costs...
3 / 5 (1) Nov 22, 2016
They're advertising a 15 min charge for 7 hour battery life with the new Google phone.
5 / 5 (1) Nov 23, 2016
Yay! Way to go as far as cool material!
Though, let's do some math here as far as phones:
* 3000mAh / 5s = 2000 A (Congrats. That's your new charger, cable, and phone port spec.)
* Now let's google "welding cable" and click Images. That's 100A, not 2000A.
I'm not sure our phone cable would be street legal anymore. :)
5 / 5 (1) Nov 23, 2016
wow, if they don't oversell it, this sounds as the next big thing.

Well, they say themselves that it's not (yet) ready for commercialization. Which, as you point out, probably means the manufacturing process is tricky or not easily scaleable.

3000mAh / 5s

They say that you *could* charge your phone in that time - not that you *should*. I'm pretty sure people will accept charging times of a few minutes a week instead of a few seconds.

But if this can be used in EVs as the main energy storage (which from the article I gather it can't for some reason...maybe because the stuff heats up?) ...this might be an approach for EVs where charging stations can be specially built with storage that can deliver lots of power in a small time for a full recharge within minutes.
not rated yet Nov 23, 2016
What about energy density? Supercapacitors suck at energy density (10-20 Wh/kg)

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