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Rubber material may hold key to long-lasting, safer EV batteries

Prof. Seung Woo Lee (left) and Michael J. Lee (right) have demonstrated a more cost-effective, safer solid polymer electrolyte (rubber material) for all-solid-state batteries. [Credit: Georgia Tech]

 

 

For electric vehicles (EVs) to become mainstream, they need cost-effective, safer, longer-lasting batteries that won't explode during use or harm the environment. Researchers at the Georgia Institute of Technology may have found a promising alternative to conventional lithium-ion batteries made from a common material: rubber.

Elastomers, or synthetic rubbers, are widely used in consumer products and advanced technologies such as wearable electronics and soft robotics because of their superior mechanical properties. The researchers found that the material, when formulated into a 3D structure, acted as a superhighway for fast lithium-ion transport with superior mechanical toughness, resulting in longer-charging batteries that can go farther. The research, conducted in collaboration with the Korea Advanced Institute of Science and Technology, was published recently in the journal Nature.

In conventional lithium-ion batteries, ions are moved by a liquid electrolyte. However, the battery is inherently unstable: even the slightest damage can leak into the electrolyte, leading to explosion or fire. The safety issues have forced the industry to look at solid-state batteries, which can be made using inorganic ceramic material or organic polymers.

"Most of the industry is focusing on building inorganic solid-state electrolytes, but they are hard to make, expensive, and are not environmentally friendly," said Seung Woo Lee, associate professor in the George W. Woodruff School of Mechanical Engineering, who is part of a team of researchers who have uncovered a rubber-based organic polymer superior to other materials. Solid polymer electrolytes continue to attract great interest because of their low manufacturing cost, non-toxicity, and soft nature. However, conventional polymer electrolytes do not have sufficient ionic conductivity and mechanical stability for reliable operation of solid-state batteries.

Novel 3D design leads to jump in energy density and performance
Georgia Tech engineers have solved common problems (slow lithium-ion transport and poor mechanical properties) using the rubber electrolytes. The key breakthrough was allowing the material to form a three-dimensional interconnected plastic crystal phase (these crystals are what conduct the ions) within the robust rubber matrix (this is what makes the electrolyte structure strong and flexible). This unique structure has resulted in high ionic conductivity, superior mechanical properties, and electrochemical stability.

This rubber electrolyte can be made using a simple polymerization process at low temperature conditions, generating robust and smooth interfaces on the surface of electrodes. These unique characteristics of the rubber electrolytes prevent lithium dendrite growth and allow for faster-moving ions, enabling reliable operation of solid-state batteries even at room temperature.

"Rubber has been used everywhere because of its high mechanical properties, and it will allow us to make cheap, more reliable, and safer batteries," said Lee.

"Higher ionic conductivity means you can move more ions at the same time," said Michael Lee, a mechanical engineering graduate researcher. "By increasing specific energy and energy density of these batteries, you can increase the mileage of the EV."

The researchers are now looking at ways to improve the battery performance by increasing its cycle time and decreasing the charging time through even better ionic conductivity. So far, their efforts have seen a two-time improvement in the battery's performance/cycle time.

The work could enhance Georgia's reputation as a center for EV innovation. SK Innovation, a global energy and petrochemical company, is funding additional research of the electrolyte material as part of its ongoing collaboration with the institute to build next-generation solid-state batteries that are safer and more energy dense than conventional Li-ion batteries. SK Innovation recently announced construction of a new EV battery plant in Commerce, GA, expected to produce an annual volume of lithium-ion batteries equal to 21.5 gigawatt-hours by 2023.

Source: Georgia Tech

Published April 2022

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