Nanotechnology Now – Press Release: Solid polymer electrolyte reinforced bilayer PET/PVDF substrate enhances performance of solid state lithium metal batteries
Home > press > Bilayer PET/PVDF solid polymer electrolyte reinforced substrate enhances the performance of solid-state lithium metal batteries
| This study reveals a promising strategy for fabricating reliable polymer electrolytes for all solid state batteries. CREDITS Ick Soo Kim, SHINSHU UNIVERSITY |
Abstract:
Effective energy storage is critical to society’s transition to renewable energy. Lithium metal batteries (LMB) have the potential to double the amount of energy stored on a single charge compared to today’s lithium ion batteries (LIB), but the growth of lithium dendrites and consumption of electrolyte in current LMB technologies hinder battery performance. Substrates for solid polymer electrolytes (SPEs) offer a potential solution to current LMB limitations, but SPEs require their own optimization before being integrated into all-solid-state LMB systems (ASSLMB).
The solid polymer electrolyte reinforced by a bilayer PET/PVDF substrate enhances the performance of solid state lithium metal batteries
Nagano City, Japan | Posted on March 24, 2023
A team of distinguished scientists from Shinshu University, Kyoto University and Sungkyunkwan University recently reported on the development of a nonwoven bilayer polyethylene terephthalate (PET) polyethylene terephthalate (PET) nanofiber/polyvinylidene fluoride (PVDF) membrane using a mechanical pressing method, which acts as a separator for the LIB system to prevent circuits. short between electrodes. The separators reflect increased wettability, or the ability of a liquid electrolyte containing lithium ions to contact the electrodes, and the thermal stability of the battery system. Importantly, this bilayer membrane can also be used in SPE of LMB systems to prevent detrimental lithium dendrite growth and structural failure. In their current research study, the research team produced a similar bilayer PET/PVDF (nPPV) substrate using the electrospinning method to prevent the formation of cavities and folds between the two layers reducing the longevity of the PVDF layer. This study characterizes nPPV-reinforced solid polymer electrolytes (nPPV-SPEs) for mechanical, thermal, and electrochemical properties, and tests confirm that the substrate significantly enhances the performance of the ASSLMB system.
The team published their results online in the Journal of Power Sources on February 28.
“Given the poor cycling performance (charge-discharge cycle) of SPE stemming from low mechanical and thermal properties, this project focuses on fabricating SPE reinforced by a bilayer substrate consisting of a PET nonwoven fabric layer and a PVDF nanofiber layer to improve structural stability. and thus the cycle performance of the SPE,” said Ick Soo Kim, corresponding author of the study and professor in the Nano Fusion Technology Research Group at the Institute of Fiber Engineering (IFES) at Shinshu University. Importantly, SPE consisting of a polymer matrix and lithium salt exhibits properties such as flexibility and processability that are compatible with LMB electrodes. The electrospinning method also eliminates folds and voids created by the pressing method between the PET and PVDF layers, providing a simple, easy and adaptable manufacturing method for nanofiber membranes.
“Nanofibers produced using industrial-scale electrospinning equipment by LEMON CO., Ltd. ensures a small and uniform pore size with high porosity, thereby accommodating polymer materials and lithium salts without affecting ion diffusion and increasing electrochemical oxidation stability,” said Kim. For this study, PVDF nanofiber was electropunched directly onto the PET microfiber layer to produce a stronger bilayer material. The improved structural stability allows the SPE to withstand the chemical reactions that occur in the system during long-term charge and recharge cycles. “The bilayer substrate significantly improves the mechanical and thermal properties of the solid polymer electrolyte, which allows the cell to operate for more than 2000 hours,” said Kim. In addition, the material’s high tensile strength suppresses the growth of lithium dendrites, one of the significant challenges of the LMB system.
Despite the advances in SPE technology, the research team recognizes that more work is needed to realize the potential of solid state electrolytes (SSE) such as SPE. “The better structural stability of SPE ensures long service life and safe use of lithium batteries, but the rate performance and mobility of SPE lithium are still inferior to those of the liquid electrolyte in lithium ion batteries. The next step is to increase the ionic conductivity to meet the fast charge and discharge requirements,” said Kim. The researchers predict that additional substrates will be studied to further enhance the electrochemical properties of SPEs and advance ASSLMB system technology.
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About Shinshu University
Shinshu University is a national university founded in 1949, located beneath the Japanese Alps in Nagano, an area known for its stunning natural scenery. Our motto, “Powered by Nature – strengthening our networks with communities and applying nature to create innovative solutions for a better tomorrow,” reflects our mission to nurture promising creative professionals and deepen collaborative relationships with local communities, which contribute to regional development. through innovation in various fields. We provide solutions for building a sustainable society through interdisciplinary research fields, such as materials science (carbon, fiber, and composites), biomedical science (for intractable diseases and preventive medicine), and mountain science. We encourage research and innovation through collaborative projects with leading researchers from around the world. For more information, visit our website or follow us on Twitter @ShinshuUni for our latest news.
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