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Abstract

PVDF nanofibers were fabricated by the electrospinning method from polyvinylidene fluoride (PVDF) solutions in mixture of DMF and acetone solvents. PVDF fibers were then converted to CNF fibers through the low-temperature chemical stabilization ("dehydrofluorination") before carbonization at 800°C. The free-standing, perforated features of the CNF-based PVDF enabled the CNF to be directly applied as an air cathode in a LOB just after drying, without requiring additional conducting additives or polymeric binders. The interconnected pores between the individual CNFs were estimated to be 2‒4 µm. This could prevent the electrode from clogging when the discharge product was formed. With the interstitial voids and a large surface area, the CNF electrode synthesized from polymer PVDF had a capacity of 2,600 mAh/g with a current density of 200 mA/g. Moreover, CNF fibers, synthesized from electrospun PVDF nanofibers containing C‒F bonds, could improve the electrode conductivity, forming Li2O2 discharge products with less crystalline properties, leading to overpotential reduction during a discharge. This contributed to the longer cycle life of Li-O2 batteries using the CNF synthesized from electrospun PVDF nanofibers electrode (97 cycles) compared to the one synthesized from electrospun PAN nanofibers electrode (73 cycles) at a limited capacity of 1,000 mA/h and a current density of 200 mA/g. Their structure and morphology were evaluated by Scanning Electron Microscopy, Fourier-transform infrared Spectroscopy, Energy Dispersive X-ray Spectroscopy, X-ray diffraction, and Raman Spectroscopy.



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Issue: Vol 6 No 3 (2022): Vol 6, Issue 3: Under publishing
Page No.: In press
Published: Sep 19, 2022
Section: Original Research
DOI: https://doi.org/10.32508/stdjns.v6i3.1193

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Copyright: The Authors. This is an open access article distributed under the terms of the Creative Commons Attribution License CC-BY 4.0., which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

 How to Cite
Le, M., Pham, P., & Bui, H. (2022). Synthesis of carbon nanofibers from electrospun polyvinylidene fluoride nanofibers for cathode electrodes in Li-O2 batteries. VNUHCM Journal of Natural Sciences, 6(3), In press. https://doi.org/https://doi.org/10.32508/stdjns.v6i3.1193

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