Better Batteries for Grid-Scale Energy Storage

When energy is discharged from the new battery, the sodium metal produces sodium ions and electrons. On the other side, the electrons turn iodine into iodide ions. The sodium ions move across a separator to the other side where they react with the iodide ions to form molten sodium iodide salt. Instead of a sulfuric acid electrolyte, the middle of the battery is a special ceramic separator that allows only sodium ions to move from side to side, nothing else.

“In our system, unlike a lithium ion battery, everything is liquid on the two sides,” Spoerke said. “That means we don’t have to deal with issues like the material undergoing complex phase changes or falling apart; it’s all liquid. Basically, these liquid-based batteries don’t have as limited a lifetime as many other batteries.”

In fact, commercial molten sodium batteries have lifetimes of 10-15 years, significantly longer than standard lead-acid batteries or lithium ion batteries.

Long-Lasting Batteries That Are Safer
Sandia’s small, lab-scale sodium-iodide battery was tested for eight months inside an oven. Martha Gross, a postdoctoral researcher who has worked on the laboratory tests for the past two years, conducted experiments charging and discharging the battery more than 400 times over those eight months.

Because of the COVID-19 pandemic, they had to pause the experiment for a month and let the molten sodium and the catholyte cool down to room temperature and freeze, she said. Gross was pleased that after warming the battery up, it still worked.

This means that if a large-scale energy disruption were to occur, like what occurred in Texas in February, the sodium-iodide batteries could be used, and then allowed to cool until frozen. Once the disruption was over, they could be warmed up, recharged and returned to normal operation without a lengthy or costly start-up process, and without degradation of the battery’s internal chemistry, Spoerke added.

Sodium-iodide batteries are also safer. Spoerke said, “A lithium ion battery catches on fire when there is a failure inside the battery, leading to runaway overheating of the battery. We’ve proven that cannot happen with our battery chemistry. Our battery, if you were to take the ceramic separator out, and allow the sodium metal to mix with the salts, nothing happens. Certainly, the battery stops working, but there’s no violent chemical reaction or fire.”

If an outside fire engulfs a sodium-iodide battery, it is likely the battery will crack and fail, but it shouldn’t add fuel to the fire or cause a sodium fire, Small added.

Additionally, at 3.6 volts, the new sodium-iodide battery has a 40% higher operating voltage than a commercial molten sodium battery. This voltage leads to higher energy density, and that means that potential future batteries made with this chemistry would need fewer cells, fewer connections between cells and an overall lower unit cost to store the same amount of electricity, Small said.

“We were really excited about how much energy we could potentially cram into the system because of the new catholyte we’re reporting in this paper,” Gross added. “Molten sodium batteries have existed for decades, and they’re all over the globe, but no one ever talks about them. So, being able to lower the temperature and come back with some numbers and say, ‘this is a really, really viable system’ is pretty neat.”

The Future of Sodium-Iodide Batteries
The next step for the sodium-iodide battery project is to continue to tune and refine the catholyte chemistry to replace the gallium chloride component, Small said. Gallium chloride is very expensive, more than 100 times as expensive as table salt.

The team is also working on various engineering tweaks to get the battery to charge and discharge faster and more fully, Spoerke added. One previously identified modification to speed up the battery charging was to coat the molten sodium side of the ceramic separator with a thin layer of tin.

Spoerke added that it would likely take five to 10 years to get sodium-iodide batteries to market, with most of the remaining challenges being commercialization challenges, rather than technical challenges.

“This is the first demonstration of long-term, stable cycling of a low-temperature molten-sodium battery,” Spoerke said. “The magic of what we’ve put together is that we’ve identified salt chemistry and electrochemistry that allow us to operate effectively at 230 degrees Fahrenheit. This low-temperature sodium-iodide configuration is sort of a reinvention of what it means to have a molten sodium battery.”