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Game-Changer in Electric Vehicles: New Battery Design Curbs Fires & Supercharges Storage

October 29, 2023
in Science
Game-Changer in Electric Vehicles: New Battery Design Curbs Fires & Supercharges Storage
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Futuristic Electric Vehicle

University of Maryland scientists have pioneered a technology to make lithium batteries safer and more efficient for EVs by suppressing dendrite growth. While promising, there are challenges ahead in design and costs, with potential commercial rollout by 2026.

Maryland engineering researchers have developed a way to prevent damage that plagues next-gen lithium batteries.

University of Maryland researchers focusing on the failure mechanisms of lithium batteries have pioneered a technology that may lead to safer and more energy-efficient electric vehicles (EVs). This advancement could mitigate the risk of battery fires, a key concern with existing battery technologies.

Suppressing Dendrite Growth

The innovative method, presented in a paper published Wednesday in the journal Nature, suppresses the growth of lithium dendrites—damaging branch-like structures that develop inside so-called all-solid-state lithium batteries, preventing firms from broadly commercializing the promising technology. But this new design for a battery “interlayer,” led by Department of Chemical and Biomolecular Engineering Professor Chunsheng Wang, stops dendrite formation, and could open the door for the production of viable all-solid-state batteries for EVs.

Current Battery Challenges

At least 750,000 registered EVs in the U.S. run on lithium-ion batteries—popular because of their high energy storage but containing a flammable liquid electrolyte component that burns when overheated. While no government agency tracks vehicle fires by type of car, and electric car battery fires appear to be relatively rare, they pose particular risks; the National Transportation Safety Board reports that first responders are vulnerable to safety risks, including electric shock and the exposure to toxic gasses emanating from damaged or burning batteries.

Advancements in All-Solid-State Batteries

All-solid-state batteries could lead to cars that are safer than current electric or internal combustion models, but creating a strategy to bypass the drawbacks was laborious, Wang said. When these batteries are operated at the high capacities and charging-discharging rates that electric vehicles demand, lithium dendrites grow toward the cathode side, causing short circuits and a decay in capacity.

He and Postdoctoral Associate Hongli Wan began to develop a theory for the formation of lithium dendrite growth in 2021; it remains a matter of scientific debate, the researchers said.

“After we figured out that part, we proposed the idea to redesign the interlayers that would effectively suppress the lithium dendrite growth,” he said.

Their solution is unique because of the stabilizing of the battery’s interfaces between the solid electrolyte and the anode (where electrons from a circuit enter the battery) and the electrolyte and the cathode (where energy flows out of the battery). The new battery structure adds a fluorine-rich interlayer that stabilizes the cathode side, as well as a modification of the anode’s interlayer with magnesium and bismuth—suppressing the lithium dendrite.

“Solid-state batteries are next-generation because they can achieve high energy and safety. In current batteries, if you achieve high energy, you’ll sacrifice safety,” said Wang.

Road to Commercialization

Researchers have other challenges to solve before the product enters the market. To commercialize all-solid-state batteries, experts will have to scale down the solid electrolyte layer to achieve a similar thickness to the lithium-ion batteries’ electrolyte, which will improve energy density—or how much power the battery can store. High costs of basic materials are another challenge, the team said.

Aiming to release the new batteries to the market by 2026, advanced battery manufacturer Solid Power plans to begin trials of the new technology to assess its potential for commercialization. Continuing research aims to further boost energy density, the researchers said.

Reference: “Interface design for all-solid-state lithium batteries” by Hongli Wan, Zeyi Wang, Weiran Zhang, Xinzi He and Chunsheng Wang, 25 October 2023, Nature.
DOI: 10.1038/s41586-023-06653-w

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Copyright for syndicated content belongs to the linked Source : SciTechDaily – https://scitechdaily.com/game-changer-in-electric-vehicles-new-battery-design-curbs-fires-supercharges-storage/

Tags: ElectricGame-Changerscience
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