New electrolyte design boosts lithium metal battery range while minimizing fluorine content

A new electrolyte design for lithium metal batteries could significantly boost the range of electric vehicles. Researchers at ETH Zurich have radically reduced the amount of environmentally harmful fluorine required to stabilize these batteries.

Lithium metal batteries are among the most promising candidates for the next generation of high-energy batteries. They can store at least twice as much energy per unit of volume as the lithium-ion batteries that are in widespread use today. This will mean, for example, that an electric car can travel twice as far on a single charge, or that a smartphone will not have to be recharged so often.

At present, there is still one crucial drawback with lithium metal batteries: the liquid electrolyte requires the addition of significant amounts of fluorinated solvents and fluorinated salts, which increases its environmental footprint.

Without the addition of fluorine, however, lithium metal batteries would be unstable, they would stop working after very few charging cycles and be prone to short circuits as well as overheating and igniting.

A research group led by Maria Lukatskaya, Professor of Electrochemical Energy Systems at ETH Zurich, has now developed a new method that dramatically reduces the amount of fluorine required in lithium metal batteries, thereby rendering them more environmentally friendly and more stable as well as cost-effective.

The work is published in the journal Energy & Environmental Science. An application for a patent has been made.

A stable protective layer increases battery safety and efficiency

The fluorinated compounds from the electrolyte help the formation of a protective layer around the metallic lithium at the negative electrode of the battery.

"This protective layer can be compared to the enamel of a tooth," Lukatskaya explains. "It protects the metallic lithium from continuous reaction with electrolyte components."

Without it, the electrolyte would quickly get depleted during cycling, the cell would fail, and the lack of a stable layer would result in the formation of lithium metal whiskers—'dendrites'—during the recharging process instead of a conformal flat layer.

Should these dendrites touch the positive electrode, this would cause a short circuit with the risk that the battery heats up so much that it ignites. The ability to control the properties of this protective layer is therefore crucial for battery performance. A stable protective layer increases battery efficiency, safety and service life.

Minimizing fluorine content

"The question was how to reduce the amount of added fluorine without compromising the protective layer's stability," says doctoral student Nathan Hong. The group's new method uses electrostatic attraction to achieve the desired reaction. Here, electrically charged fluorinated molecules serve as a vehicle to transport the fluorine to the protective layer.

This means that only 0.1% by weight of fluorine is required in the liquid electrolyte, which is at least 20 times lower than in prior studies.

Optimized method makes batteries greener

One of the biggest challenges was to find the right molecule to which fluorine could be attached and that would also decompose again under the right conditions once it had reached the lithium metal.

As the group explains, a key advantage of this method is that it can be seamlessly integrated into the existing battery production process without generating additional costs to change the production setup.

The batteries used in the lab were the size of a coin. In a next step, the researchers plan to test the method's scalability and apply it to pouch cells as used in smartphones.