Facile and scalable fabrication of high-energy-density sulfur cathodes for pragmatic lithium-sulfur batteries

Min Seop Kim, Mun Sek Kim, Vandung Do, Yongyao Xia, Woong Kim, Won Il Cho

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Lithium-sulfur battery is garnering much of attention due to its high energy densities, low-cost active material of sulfur and variety of applications in portable electronics. High integrity and consistent qualities of the large-scale sulfur cathode with high energy have to be ensured to construct reliable and practical lithium-sulfur batteries that could supersede advancing lithium-ion batteries. Here, facile and productive approaches are developed to mass-produce functional sulfur hosts and to fabricate large-scale sulfur cathode with high sulfur loading. The functional sulfur host is synthesized by anchoring polyethylenimine at the surface of commercially available carbon at inert conditions with a scale of more than 10 g per batch via simple solution method. Combining the functionalized sulfur host with a polyacrylic acid binder allows high integrity and uniformity of the high sulfur loading cathode to be fabricated in large dimensions. Followed by this approach, the sulfur cathode, 70 × 6 cm 2 , is produced with the sulfur loading of >4.3 mg cm −2 . It is found that 12 wt% of polyethylenimine in the functionalized sulfur host with polyacrylic acid is at optimal condition that presents stable electrochemical performances over 600 cycles.

Original languageEnglish
Pages (from-to)104-112
Number of pages9
JournalJournal of Power Sources
Volume422
DOIs
Publication statusPublished - 2019 May 15

Keywords

  • Large-scale sulfur cathode
  • Lithium-sulfur batteries
  • Polar binder
  • Surface functionalization

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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