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

8 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

Keywords

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

ASJC Scopus subject areas

  • Chemistry(all)
  • Polymers and Plastics

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