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Clean Energy, Literally: Soap-Inspired Batteries for a Greener Future

January 14, 2024
in Science
Clean Energy, Literally: Soap-Inspired Batteries for a Greener Future
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Improved High Tech Battery Concept

Researchers have discovered that understanding how soap cleans can inform the development of longer-lasting batteries. The research reveals that localized high-concentration electrolytes in batteries work similarly to micelles in soap. This understanding could enhance the energy storage capacity of lithium metal batteries, marking a significant advance in battery technology.

Researchers discovered that a highly promising electrolyte for creating more durable lithium batteries possesses intricate nanostructures, which function similarly to the way micelles behave in soapy water.

In the quest for developing longer-lasting batteries, researchers from Brown University and Idaho National Laboratory have discovered that the answer might lie in understanding how things get clean — specifically how soap works in this process.

Take handwashing, for instance. When someone washes their hands with soap, the soap forms structures called micelles that trap and remove grease, dirt, and germs when flushed with water. The soap does this because it acts as a bridge between the water and what is being cleaned away, by binding them and wrapping them into those micelle structures.

In conducting a new study published in Nature Materials, researchers noticed that a similar process plays out in what has become one of the most promising substances for designing longer-lasting lithium batteries — a new type of electrolyte called a localized high-concentration electrolyte. This new understanding of how this process works, they posit in the paper, might be the missing piece to fully kicking the door open in this emerging sector of technology.

Improving Energy Storage in Batteries

“The big picture is that we want to improve and increase the energy density for batteries, meaning how much energy they store per cycle and how many cycles the battery lasts,” said Yue Qi, a professor at Brown’s School of Engineering. “To do this, materials inside of traditional batteries need to be replaced to make long-life batteries that store more energy a reality — think batteries that can power a phone for a week or more, or electric vehicles that go for 500 miles.”

Scientists have been actively working to transition to batteries made from lithium metal because they have a much higher energy storage capacity than today’s lithium-ion batteries. The holdup is traditional electrolytes, which are integral because they allow an electrical charge to pass between a battery’s two terminals, sparking the electrochemical reaction needed to convert stored chemical energy to electric energy. Traditional electrolytes for lithium-ion batteries, which are essentially made of low-concentration salt dissolved in a liquid solvent, don’t do this effectively in metal-based batteries.

Localized High-Concentration Electrolytes

Localized high-concentration electrolytes were engineered by scientists at Idaho National Laboratory and Pacific Northwest National Laboratory to address this challenge. They are made by mixing high concentrations of salt in a solvent with another liquid called a diluent, which makes the electrolyte flow better so that the power of the battery can be maintained.

So far, in lab tests, this new type of electrolyte has shown promising results, but how it works and why has never been fully understood — putting a cap on how effective it can be and how it can be better developed. This is what the new study helps to address.

“The paper provides a unified theory to why this electrolyte works better and the key understanding of it came by finding that micelle-like structures form within this electrolyte — like they do with soap,” said Bin Li, a senior scientist at Oak Ridge National Laboratory who worked on the study. “Here we see that the role of the soap or surfactant is played by the solvent that binds both the diluent and the salt, wrapping itself around the higher concentration salt in the center of the micelle.”

By understanding this, the researchers were able to break down the ratios and concentrations needed to bring about the optimal reactions for the batteries. This should help solve one of the main trouble points in engineering this electrolyte, which is finding the proper balance for the three ingredients. In fact, the work not only provides better guidelines for making localized high-concentration electrolytes that function, but for making ones that work even more effectively.

Researchers at Idaho National Laboratory put the theory into action. Doing so, they found the theory, so far, holds up and helps to extend the life of lithium metal batteries. The team is excited to see what designs for localized high-concentration electrolytes come from their work but know significant progress remains to overcome the electrolyte design bottleneck for high-density batteries. Right now, they are amused that the secret may have been in something as mundane and every day as soap.

“The concept of the micelle may be new for the electrolyte, but it’s actually very common for our daily life,” Qi said. “Now we have a theory, and we have guidelines to get interactions we want from the salt, the solvent, and the diluent in the electrolyte, and what concentration they have to be at and how you mix them.”

Reference: “Localized high-concentration electrolytes get more localized through micelle-like structures” by Corey M. Efaw, Qisheng Wu, Ningshengjie Gao, Yugang Zhang, Haoyu Zhu, Kevin Gering, Michael F. Hurley, Hui Xiong, Enyuan Hu, Xia Cao, Wu Xu, Ji-Guang Zhang, Eric J. Dufek, Jie Xiao, Xiao-Qing Yang, Jun Liu, Yue Qi and Bin Li, 6 November 2023, Nature Materials.
DOI: 10.1038/s41563-023-01700-3

The study was funded by the US Department of Energy. 

>>> Read full article>>>
Copyright for syndicated content belongs to the linked Source : SciTechDaily – https://scitechdaily.com/clean-energy-literally-soap-inspired-batteries-for-a-greener-future/

Tags: Cleanenergyscience
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