Sodium-Ion Batteries

In September 2020, the Department of Energy’s Advanced Research Projects Agency–Energy awarded Santa Clara, California-based Natron Energy USD $19.9 million as part of a new program to fast-track technologies, with the goal of advancing their commercialization efforts. The batteries are now in low-volume commercial production, says VP of Sales Jack Pouchet. Natron’s first customers are data centers and telecom companies.

“From a pure performance point-of-view, sodium-ion batteries are not attractive for portable electronics or electric vehicles,” says K. M. Abraham, research professor at Northeastern University and CTO of lithium battery consulting firm E-KEM Sciences. Lithium-ion batteries boast a higher energy density than sodium-ions, which means a compact lithium-ion will have a longer run time between charges. So far, sodium-ions have demonstrated about half the energy density of lithium, which can reach 285 Wh/kg, he says.

But sodium-ion batteries could give lithium-ions a run for their money in stationary applications like renewable energy storage for homes and the grid or backup power for data centers, where cost is more important than size and energy density. Based on currently available information, Abraham projects the cost of sodium-ion batteries to be about 10–20 percent less than lithium-ion.

The biggest thing going for sodium batteries is their use of abundant, cheap, and benign materials. There is over one-thousand times more sodium than lithium in the Earth’s crust. It also costs less to extract and purify. Moreover, sodium metal oxide cathodes typically used in batteries—the anodes are carbon just like lithium-ion batteries—can be made from plentiful metals such as iron and manganese. Lithium-ion cathodes, by contrast, use cobalt, a metal with limited geological reserves and an iffy supply chain centered on a handful of countries. And other batteries such as lead-acid and nickel-cadmium contain toxic metals. “The main attraction of sodium is sustainability,” Abraham says.

Sodium batteries are also more stable and safe than lithium-ion. They have a wider temperature range, are nonflammable, and there is no thermal runaway—which can cause lithium-ion batteries to catch fire—under any condition, says Pouchet.

Natron is one of only a handful of players developing and commercializing sodium-ion batteries. The company is taking a unique approach, making both the cathode and anode from Prussian Blue, the pigment used in paints and dyes. The low-cost material’s chemical structure is very good at soaking up and releasing sodium ions, giving a battery that can charge and discharge in minutes and can deliver quick bursts of energy. The Prussian Blue electrodes can also last longer than carbon- and metal-based electrodes, with more than 50,000 charging cycles possible, Pouchet says.

The other leading sodium-ion battery company, UK-based Faradion, has found markets in Australia and India. Last year, the company announced that it had received its first order from investment group ICM Australia for use in the Australian market, where battery storage demand has been increasing for residential, commercial and grid scale applications. They are also developing their batteries for commercial vehicles in India.

Faradion says its prototype cells can deliver energy density over 140 Wh/kg.

Source: https://spectrum.ieee.org/energywise/energy/batteries-storage/sodium-ion-batteries-poised-to-pick-off-large-scale-lithium-applications

https://natron.energy/news/

September 2020: Natron Announces First-Ever UL Listed Sodium-Ion Battery. A safe, sustainable, energy-efficient battery is now available to ship for data center, telecom, and mission-critical applications. More info here.

September 2020: Bloomberg Businessweek highlights Natron’s batteries as a leading alternative to Li-ion. More information here.

September 2020: Natron Energy has received a $20M award from ARPA-E for domestic manufacturing of its sodium-ion batteries. More information here.

July 2020: Natron Energy raises $35 million Series D financing. This new funding will support sales and manufacturing ramp up for data center in-rack power solutions. More info here.