Synthesis of a flexible freestanding sulfur/polyacrylonitrile/graphene oxide as the cathode for lithium/sulfur batteries

Huifen Peng, Xiaoran Wang, Yan Zhao, Taizhe Tan, Zhumabay Bakenov, Yongguang Zhang

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Rechargeable lithium/sulfur (Li/S) batteries have received quite significant attention over the years because of their high theoretical specific capacity (1672 mAh·g-1) and energy density (2600 mAh·g-1) which has led to more efforts for improvement in their electrochemical performance. Herein, the synthesis of a flexible freestanding sulfur/polyacrylonitrile/graphene oxide (S/PAN/GO) as the cathode for Li/S batteries by simple method via vacuum filtration is reported. The S/PAN/GO hybrid binder-free electrode is considered as one of the most promising cathodes for Li/S batteries. Graphene oxide (GO) slice structure provides effective ion conductivity channels and increases structural stability of the ternary system, resulting in excellent electrochemical properties of the freestanding S/PAN/GO cathode. Additionally, graphene oxide (GO) membrane was able to minimize the polysulfides' dissolution and their shuttle, which was attributed to the electrostatic interactions between the negatively-charged species and the oxygen functional groups on GO. Furthermore, these oxygen-containing functional groups including carboxyl, epoxide and hydroxyl groups provide active sites for coordination with inorganic materials (such as sulfur). It exhibits the initial reversible specific capacity of 1379 mAh·g-1 at a constant current rate of 0.2 C and maintains 1205 mAh·g-1 over 100 cycles (~87% retention). In addition, the freestanding S/PAN/GO cathode displays excellent coulombic efficiency (~100%) and rate capability, delivering up to 685 mAh·g-1 capacity at 2 C.

Original languageEnglish
Article number399
JournalPolymers
Volume10
Issue number4
DOIs
Publication statusPublished - Apr 3 2018

Fingerprint

Graphite
Polyacrylonitriles
Sulfur
Oxides
Graphene
Cathodes
Functional groups
Oxygen
Polysulfides
Epoxy Compounds
Ternary systems
Coulomb interactions
Lithium sulfur batteries
polyacrylonitrile
Electrochemical properties
Ion Channels
Hydroxyl Radical
Binders
Dissolution
Vacuum

Keywords

  • Freestanding cathode
  • Lithium/sulfur battery
  • Sulfur/polyacrylonitrile/graphene oxide

ASJC Scopus subject areas

  • Chemistry(all)
  • Polymers and Plastics

Cite this

Synthesis of a flexible freestanding sulfur/polyacrylonitrile/graphene oxide as the cathode for lithium/sulfur batteries. / Peng, Huifen; Wang, Xiaoran; Zhao, Yan; Tan, Taizhe; Bakenov, Zhumabay; Zhang, Yongguang.

In: Polymers, Vol. 10, No. 4, 399, 03.04.2018.

Research output: Contribution to journalArticle

Peng, Huifen ; Wang, Xiaoran ; Zhao, Yan ; Tan, Taizhe ; Bakenov, Zhumabay ; Zhang, Yongguang. / Synthesis of a flexible freestanding sulfur/polyacrylonitrile/graphene oxide as the cathode for lithium/sulfur batteries. In: Polymers. 2018 ; Vol. 10, No. 4.
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