Flexible S/DPAN/KB Nanofiber Composite as Binder-Free Cathodes for Li-S Batteries

Zhumabay Bakenov, Almagul Mentbayeva, Sandugash Kalybekkyzy, Yongguang Zhang

Research output: Contribution to journalArticle

Abstract

Sulfur/dehydrogenated polyacrylonitrile/ketjen black (S/DPAN/KB) flexible nanofiber composite was prepared by electrospinning technique and tested as a freestanding cathode for high-performance flexible lithium/sulfur batteries. S/PAN/KB was dehydrogenated at 300◦C without carbonizing and used as a cathode without any binder/current collector. The SEM observations of the obtained S/DPAN/KB nanofibers showed that the fiber diameters were in a range of 300–600 nm and the sample had a rough surface due to the presence of the S/KB particles. According to the SEM/EDS analysis sulfur is uniformly distributed within PAN fibers in both S/PAN/KB and S/DPAN/KB (heat treated) composites. The prepared binder-free S/DPAN/KB composite cathode exhibited a good electrochemical performance delivering a reversible capacity of 917 mAh g−1 after 150 cycles, exhibiting a coulombic efficiency about 100%, and demonstrating stable cyclability and good rate capability with a reversible capacity of 342 mA h g−1 at 1 C. The obtained composite cathode is highly flexible and can be used for LIB powering flexible electronic devices.
LanguageEnglish
PagesA5396-A5402
JournalJournal of the Electrochemical Society
Volume166
Issue number3
DOIs
Publication statusPublished - Jan 23 2019

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Polyacrylonitriles
Nanofibers
Sulfur
Binders
Cathodes
Composite materials
Flexible electronics
Scanning electron microscopy
Fibers
Electrospinning
Energy dispersive spectroscopy
Lithium sulfur batteries
polyacrylonitrile

Keywords

  • Batteries - Lithium
  • electrospinning method
  • freestanding sulfur cathode
  • lithium-sulfur battery

Cite this

Flexible S/DPAN/KB Nanofiber Composite as Binder-Free Cathodes for Li-S Batteries. / Bakenov, Zhumabay; Mentbayeva, Almagul; Kalybekkyzy, Sandugash; Zhang, Yongguang.

In: Journal of the Electrochemical Society, Vol. 166, No. 3, 23.01.2019, p. A5396-A5402.

Research output: Contribution to journalArticle

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abstract = "Sulfur/dehydrogenated polyacrylonitrile/ketjen black (S/DPAN/KB) flexible nanofiber composite was prepared by electrospinning technique and tested as a freestanding cathode for high-performance flexible lithium/sulfur batteries. S/PAN/KB was dehydrogenated at 300◦C without carbonizing and used as a cathode without any binder/current collector. The SEM observations of the obtained S/DPAN/KB nanofibers showed that the fiber diameters were in a range of 300–600 nm and the sample had a rough surface due to the presence of the S/KB particles. According to the SEM/EDS analysis sulfur is uniformly distributed within PAN fibers in both S/PAN/KB and S/DPAN/KB (heat treated) composites. The prepared binder-free S/DPAN/KB composite cathode exhibited a good electrochemical performance delivering a reversible capacity of 917 mAh g−1 after 150 cycles, exhibiting a coulombic efficiency about 100{\%}, and demonstrating stable cyclability and good rate capability with a reversible capacity of 342 mA h g−1 at 1 C. The obtained composite cathode is highly flexible and can be used for LIB powering flexible electronic devices.",
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AU - Kalybekkyzy, Sandugash

AU - Zhang, Yongguang

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AB - Sulfur/dehydrogenated polyacrylonitrile/ketjen black (S/DPAN/KB) flexible nanofiber composite was prepared by electrospinning technique and tested as a freestanding cathode for high-performance flexible lithium/sulfur batteries. S/PAN/KB was dehydrogenated at 300◦C without carbonizing and used as a cathode without any binder/current collector. The SEM observations of the obtained S/DPAN/KB nanofibers showed that the fiber diameters were in a range of 300–600 nm and the sample had a rough surface due to the presence of the S/KB particles. According to the SEM/EDS analysis sulfur is uniformly distributed within PAN fibers in both S/PAN/KB and S/DPAN/KB (heat treated) composites. The prepared binder-free S/DPAN/KB composite cathode exhibited a good electrochemical performance delivering a reversible capacity of 917 mAh g−1 after 150 cycles, exhibiting a coulombic efficiency about 100%, and demonstrating stable cyclability and good rate capability with a reversible capacity of 342 mA h g−1 at 1 C. The obtained composite cathode is highly flexible and can be used for LIB powering flexible electronic devices.

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