Connect with us

Hi, what are you looking for?

CleanTechnica

Batteries

“Unique Powdery Nanomaterial” Could Blow Up EV Range Anxiety

When it comes to soothing EV range anxiety, the lithium-sulfur combo offers a lot of promise, but until now there’s been a catch (there’s always a catch). Li-S batteries have a much shorter life cycle than the gold standard, lithium-ion, which makes them a poor bet for the mass market. However, researchers at Pacific Northwest National Laboratory (PNNL) may be on to a solution.

If the research leaps the Valley of Death from the lab to the market, that could spell the end of the gasmobile as we know it. According to PNNL, an Li-S battery could store up to four times more energy per mass than an Li-ion battery.

pnnl lithium sulfur battery

Metal organic framework courtesy of PNNL.

The Sulfur Cure For EV Range Anxiety

As noted above, Li-S offers far greater energy storage potential than Li-ion, but as of right now if you had an Li-S battery in your EV, you would have range anxiety on an epic scale.

The problem is the sulfur cathode (the positively charged electrode). The cathode sits in an electrolyte bath and researchers have been stuck on how to get the sulfur to stop disintegrating into the bath.

Since the disintegration is not reversible, the cathode quickly loses sulfur and there goes your Li-S battery.

A Better Sulfur Battery

Last spring, researchers at Oak Ridge National Laboratory announced one pathway to solving the life cycle problem last spring, based on a solid electrolyte in combination with a sulfur-enriched cathode and a lithium anode (the negatively charged electrode).

The new PNNL solution focuses in on a “unique, powdery nanomaterial” that can ensnare polysulfides in the cathode. Called a metal organic framework, it is a crystalline compound of metal clusters linked by organic molecules, which self-assemble into a porous structure.

If that sounds familiar, you may be thinking of gas-trapping technology based on metal organic frameworks. Their use in EV batteries represents a new field.

Think of a metal organic framework as a high tech, nanoscale sponge and you’re on the right track. Since nickel interacts strongly with sulfur, the heart of the PNNL “sponge” is a positively charged nickel center.

So far, the research team has been able to get their Li-S battery to retain 89 percent of its initial capacity after 100 charging cycles. The next step is to improve the storage capacity of the cathode and scale the whole thing up.

EV Supply Chain Anxiety

One of the concerns about transitioning to a full-on global EV market is the availability of specialty materials that go into EV batteries.

That opens up a whole new can of worms in terms of supply chain geopolitics.

In that context, sulfur does not open up a new can of worms. It is a common material (“practically free,” enthuses one enthusiastic Oak Ridge scientist), and vast quantities are produced as a byproduct of fossil fuel refining. Researchers at the University of Arizona are already finding that waste sulfur from fossil fuel refining can be used in Li-S batteries (it can also be converted to plastic, for that matter).

Follow me on Twitter and Google+.

Keep up with all the latest EV news from CleanTechnica: subscribe to our Electric Vehicle newsletter.

 
 
Appreciate CleanTechnica’s originality and cleantech news coverage? Consider becoming a CleanTechnica Member, Supporter, Technician, or Ambassador — or a patron on Patreon.
 
Have a tip for CleanTechnica, want to advertise, or want to suggest a guest for our CleanTech Talk podcast? Contact us here.

Advertisement
 
Written By

Tina specializes in military and corporate sustainability, advanced technology, emerging materials, biofuels, and water and wastewater issues. Views expressed are her own. Follow her on Twitter @TinaMCasey and Google+.

Comments

You May Also Like

Clean Power

Harnessing the power of waves, tides, and currents could unlock the secrets to achieving greater energy security with minimal environmental impact. By some estimates,...

Aviation

As much as we love electric airplanes over here at CleanTechnica, zero emission flight at any significant scale is still years away. That’s why...

Cars

A recent report from the United Kingdom highlights a maturing charging network and a reduction in range anxiety. The Automobile Association (AA) reports that...

Batteries

Plastic and molten salt batteries may be the key to grid-scale energy storage.

Copyright © 2021 CleanTechnica. The content produced by this site is for entertainment purposes only. Opinions and comments published on this site may not be sanctioned by and do not necessarily represent the views of CleanTechnica, its owners, sponsors, affiliates, or subsidiaries.