Title:
REDUCING INTERFACIAL RESISTANCE OF LI-ION BATTERIES THROUGH ATOMIC LAYER DEPOSITION
REDUCING INTERFACIAL RESISTANCE OF LI-ION BATTERIES THROUGH ATOMIC LAYER DEPOSITION
Author(s)
Lee, Hae Won
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Abstract
The attention to solid state batteries are increasing as electrical vehicles start to dominate automobile industry. Solid-state batteries (SSBs) are type of Li-ion batteries that have solid medium. They are regarded as the next-generation energy storage device for electric vehicles because they can potentially solve the problems of conventional Li-ion batteries. In conventional Li-ion batteries, when delivered in high energy densities, they had extremely high possibility for inflammation due to the presence of flammable liquid organic electrolytes. Also, though the use of Li metal anode may significantly increase energy density, likelihood of short circuiting the cell due to the growth of Li dendrites prevents the commercialization of Li-ion batteries with Li anodes. Thus, in order to provide safer and higher energy batteries, SSBs with nonflammable and mechanically robust SSEs which may suppress Li dendrite growth came up as an alternative solution.
However, there are new challenges that need to be overcome for SSBs. Not only are they more expensive than conventional Li-ion batteries, but due to solid-characteristic of the electrolyte, SSBs have critical flaw of high resistance at the SSE-electrode interfaces. The performance of SSBs in high temperature environment may be safer, but the thick SSE membrane and low active loading with the electrodes do not show better performance when compared to the liquid electrolyte cells.
To enhance the battery performance, the interfacial resistance in SSBs needs to be reduced. Therefore, the focus of our lab is to come up with a novel coating method that has the least interfacial resistance. This new study will utilize the atomic layer deposition (ALD) technique to coat metal oxides on electrodes and enhance the battery performance, as previous research by many scientists has already proven that metal oxide coatings are effective at reducing the interfacial resistance in SSBs.
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Date Issued
2021-12
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Text
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Undergraduate Thesis