Abstract
Nanofiber-based membranes were prepared by two different methods for use as separators for Lithium-ion batteries (LIBs). In the first method, Electrospinning was used for the fabrication of Polyvinylidene fluoride PVDF nanofiber coatings on polyolefin microporous membrane separators to improve their electrolyte uptake and electrochemical performance. The nanofiber-coated membrane separators show better electrolyte uptake and ionic conductivity than that for the uncoated membranes. In the second method, Forcespinning® (FS) was used to fabricate fibrous cellulose membranes as separators for LIBs. The cellulose fibrous membranes were made by the Forcespinning® of a cellulose acetate solution precursor followed by a subsequent alkaline hydrolysis treatment. The results show that the fibrous cellulose membrane-based separator exhibits high electrolyte uptake and good electrolyte/electrode wettability and therefore can be a good candidate for high performance and high safety LIB separators.
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acknowledgments
This work was supported by the Startup funding from UT system (STARS Program) to M. Alcoutlabi. The work on electrospinning at NCSU was financially supported by the Department of Energy (EE0002611-600). We would like to thank Jill Watson, Gerald Rumierz and Lie Shi from Celgard LLC for their contributions to this work.
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Alcoutlabi, M., Lee, H. & Zhang, X. Nanofiber-Based Membrane Separators for Lithium-ion Batteries. MRS Online Proceedings Library 1718, 152–156 (2014). https://doi.org/10.1557/opl.2015.556
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DOI: https://doi.org/10.1557/opl.2015.556