Nanoparticle breakthrough could mean faster charging batteries

Researchers have gained new understanding about the chemistry of lithium ion batteries

Researchers at Vanderbilt University have gained new insight into the nanoscale workings of Lithium Ion batteries, a discovery that could speed the development of batteries that can be recharged in seconds.

The team of scientists spent the last 7 months investigating batteries containing quantum dots made of iron pyrite, also known as "fool's gold."

Quantum dots are particles just a few tens of atoms wide, and researchers already know that their use in batteries allows for very fast charging. But they can also mean a death sentence for the battery.

"When the particles get very small, they begin to chemically react with the electrolytes and so the battery can only charge and discharge a few times," said Cary Pint, an assistant professor of mechanical engineering at Vanderbilt.

151112 vanderbilt battery 2 John Russell/Vanderbilt University

Anna Douglas and Cary Pint with one of the batteries she has modified by adding millions of quantum dots made from iron pyrite.

However, the team discovered that when using iron pyrite quantum dots, the battery stores energy in a fundamentally different way, and the same chemical reaction doesn't occur. The work was led by graduate student Anna Douglas.

In a conventional lithium ion battery, the lithium ions enter a storage material during charging and leave during discharge. When lithium ions enter the prototype battery they react with the iron pyrite molecules -- which are comprised of one iron atom and two sulfur atoms -- to form lithium sulphur, and the iron atom moves out. On discharge, the reverse happens and the iron pyrite is reformed.

"It reverses over and over again," said Pint. "In this case, that method of storage gives you more capacity and more energy stores. It's a much more exciting mode of energy storage, but you have to have your particle size on a scale that the iron can exit the material."

Thus the use of quantum dots. Those used are so small -- about 4.5 nanometers across -- that each experimental battery contained around 50 million of them.

151112 vanderbilt battery 4 Vanderbilt University

A transmission electron microscope image of a single iron pyrite quantum dot on the left and a graph that shows the size distribution of the fool's gold quantum dots that they added to standard lithium batteries.

"What we found is when you take these nanoparticles, you’re not limited to the 'death' mechanism. It’s really a sweet spot for integrating small nanoparticles that can charge really fast," he said.

While it won't lead to a new type of battery overnight, Pint said the most exciting aspect of the research is the insight it provides into how batteries work on the nanoscale.

"This gives us a set of design rules for a family of materials that go through these changes," he said. "We can apply the rules to the whole class of materials and design nanostructure systems that build on these rules. Until now, we didn’t have an understanding of even the basic rules."

The work is outlined in the Nov. 11 edition of the ACS Nano journal.

Join the Good Gear Guide newsletter!

Error: Please check your email address.

Our Back to Business guide highlights the best products for you to boost your productivity at home, on the road, at the office, or in the classroom.

Keep up with the latest tech news, reviews and previews by subscribing to the Good Gear Guide newsletter.

Martyn Williams

IDG News Service
Show Comments

Most Popular Reviews

Latest News Articles

Resources

PCW Evaluation Team

Azadeh Williams

HP OfficeJet Pro 8730

A smarter way to print for busy small business owners, combining speedy printing with scanning and copying, making it easier to produce high quality documents and images at a touch of a button.

Andrew Grant

HP OfficeJet Pro 8730

I've had a multifunction printer in the office going on 10 years now. It was a neat bit of kit back in the day -- print, copy, scan, fax -- when printing over WiFi felt a bit like magic. It’s seen better days though and an upgrade’s well overdue. This HP OfficeJet Pro 8730 looks like it ticks all the same boxes: print, copy, scan, and fax. (Really? Does anyone fax anything any more? I guess it's good to know the facility’s there, just in case.) Printing over WiFi is more-or- less standard these days.

Ed Dawson

HP OfficeJet Pro 8730

As a freelance writer who is always on the go, I like my technology to be both efficient and effective so I can do my job well. The HP OfficeJet Pro 8730 Inkjet Printer ticks all the boxes in terms of form factor, performance and user interface.

Michael Hargreaves

Windows 10 for Business / Dell XPS 13

I’d happily recommend this touchscreen laptop and Windows 10 as a great way to get serious work done at a desk or on the road.

Aysha Strobbe

Windows 10 / HP Spectre x360

Ultimately, I think the Windows 10 environment is excellent for me as it caters for so many different uses. The inclusion of the Xbox app is also great for when you need some downtime too!

Mark Escubio

Windows 10 / Lenovo Yoga 910

For me, the Xbox Play Anywhere is a great new feature as it allows you to play your current Xbox games with higher resolutions and better graphics without forking out extra cash for another copy. Although available titles are still scarce, but I’m sure it will grow in time.

Featured Content

Latest Jobs

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?