Silica-templated hierarchically porous carbon modified separators for lithium–sulfur batteries with superior cycling stabilities

Changhoon Choi, Dong Wan Kim

Research output: Contribution to journalArticle

Abstract

Lithium–sulfur batteries (LSBs) have attracted considerable attention for use in next-generation rechargeable storage devices owing to their high theoretical capacities (1675 mA h g−1) and natural abundance of sulfur. However, the commercialization of LSBs is hindered by the polysulfide shuttle effect and unstable cycling performances of the conventional cell configurations. As the separator is a crucial component of the cell assembly, separator modification is considered an effective approach to the fabrication of a high-performance LSB without the use of a sophisticated cathode. In this study, hierarchically porous carbons are used for the fabrication of multi-functional glass fiber (GF) separators as upper current collectors and polysulfide trapping materials. An optimized porous carbon (denoted as MC-SM) is fabricated by tuning the porosity properties such as the Brunauer–Emmett–Teller surface area and pore distribution. The MC-SM-coated GF separator provides excellent discharge capacity of 1019 mA h g−1 and Columbic efficiency (~100%) at a current density of 0.2C after 150 cycles. Even at high current rates, the cell with the fabricated porous carbon can deliver considerable reversible capacities of 700 mA h g−1 at 1C and 591 mA h g−1 at 2C after 500 cycles.

Original languageEnglish
Article number227462
JournalJournal of Power Sources
Volume448
DOIs
Publication statusPublished - 2020 Feb 1

Keywords

  • Li–S battery
  • Polysulfide shuttle effect
  • Porous carbon
  • Separator modification

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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