Feb
7
New Quick Charging Tech For Lithium Ion Batteries
February 7, 2024 | Leave a Comment
Cornell University engineers have created a new lithium battery that can charge in under five minutes – faster than any such battery on the market – while maintaining stable performance over extended cycles of charging and discharging.
The breakthrough could reduce “range anxiety” among drivers who worry electric vehicles cannot travel long distances without a time-consuming recharge.
Lynden Archer, professor of engineering and dean of Cornell’s College of Engineering, who oversaw the project said, “Range anxiety is a greater barrier to electrification in transportation than any of the other barriers, like cost and capability of batteries, and we have identified a pathway to eliminate it using rational electrode designs. If you can charge an EV battery in five minutes, I mean, gosh, you don’t need to have a battery that’s big enough for a 300-mile range. You can settle for less, which could reduce the cost of EVs, enabling wider adoption.”
The team’s paper, “Fast-Charge, Long-Duration Storage in Lithium Batteries,” has been published in Joule. The lead author is Shuo Jin, a doctoral student in chemical and biomolecular engineering.
Lithium-ion batteries are among the most popular means of powering electric vehicles and smartphones. The batteries are lightweight, reliable and relatively energy-efficient. However, they take hours to charge, and lack the capacity to handle large surges of current.
After fast charging their new lithium battery, the researchers observed its indium anode had a smooth lithium electrodeposition, whereas other anode materials can grow dendrites that impact the battery’s performance. Image Credit: Cornell University. Click the press release link to find the image with a large view hyperlink.
The researchers pinpointed indium as an exceptionally promising material for fast-charging batteries.
Indium is a soft metal, mostly used to make indium tin oxide coatings for touch-screen displays and solar panels.
The new study shows indium has two crucial characteristics as a battery anode: an extremely low migration energy barrier, which sets the rate at which ions diffuse in the solid state; and a modest exchange current density, which is related to the rate at which ions are reduced in the anode.
The combination of those qualities – rapid diffusion and slow surface reaction kinetics – is essential for fast charging and long-duration storage.
Archer noted, “The key innovation is we’ve discovered a design principle that allows metal ions at a battery anode to freely move around, find the right configuration and only then participate in the charge storage reaction. The end result is that in every charging cycle, the electrode is in a stable morphological state. It is precisely what gives our new fast-charging batteries the ability to repeatedly charge and discharge over thousands of cycles.”
That technology, paired with wireless induction charging on roadways, would shrink the size – and the cost – of batteries, making electric transportation a more viable option for drivers.
However, that doesn’t mean indium anodes are perfect, or even practical. “While this result is exciting, in that it teaches us how to get to fast-charge batteries, indium is heavy,” Archer said. “Therein lies an opportunity for computational chemistry modeling, perhaps using generative AI tools, to learn what other lightweight materials chemistries might achieve the same intrinsically low Damköhler numbers. For example, are there metal alloys out there that we’ve never studied, which have the desired characteristics? That is where my satisfaction comes from, that there’s a general principle at work that allows anyone to design a better battery anode that achieves faster charge rates than the state-of-the art technology.”
The research was supported by the U.S. Department of Energy Basic Energy Sciences Program through the Center for Mesoscale Transport Properties, an Energy Frontiers Research Center. The researchers made use of the Cornell Center for Materials Research, which is supported by the National Science Foundation’s Materials Research Science and Engineering Center program.
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This is another tech that’s just been born. There is a lot of territory to research to determine if the concepts and results translate into consumer products.
For now though there is the design principal that sets up what to be looking for or what to try to build to get to the fast charging lithium ion battery. With machine learning maturing and artificial intelligence gaining the hunt is going to pickup speed. Whether or not it drives to a more, better, cheaper solution remains unknown.
Faster charging and the soon to be needed drop in weight, especially for EVs, are two really big challenges. It might talk quite a while. But smart money might just bet these challenges get met.
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