Separators Modified Using MoO2@Carbon Nanotube Nanocomposites as Dual-Mode Li-Polysulfide Anchoring Materials for High-Performance Anti-Self-Discharge Lithium-Sulfur Batteries

Changhoon Choi, Dong Yeop Lee, Jung Been Park, Dong Wan Kim

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

The commercialization of lithium-sulfur batteries (LSBs) remains difficult owing to the shuttle effect of soluble lithium-polysulfide and the poor redox kinetics of a traditional cell configuration without a sophisticated cathode design. To resolve these difficulties, we developed modified separators with electrically exploded MoO2@carbon nanotube (MoO2@CNT) nanocomposites. The embedded MoO2 nanoparticles demonstrated strong chemical anchoring properties with polysulfides; meanwhile, a porous CNT scaffold supported suppression of the shuttle effect and acted as an upper current collector. In addition, the mesoporous textural properties of a MoO2@CNT nanocomposite provide a suitable lithium-ion pathway with enhanced ionic conductivity and additional active sites for active sulfur during cycling; finally, a high utilization of sulfur is achieved in a reversible manner. The LSBs using the modified separator with the optimized MoO2@CNT nanocomposite exhibit high discharge capacities of 1067 mA h g-1 at 0.2 C after 100 cycles and significant cycling stability at 1 C. Also, an impressive anti-self-discharge feature and improved rate capabilities were achieved through the introduction of a MoO2@CNT nanocomposite. We believe that our approach can be used as a proof-of-concept for further research into effective methods to prepare modified separators with various electrically exploded carbon-metal oxide nanocomposites that can used in high-performance LSBs.

Original languageEnglish
Pages (from-to)15134-15148
Number of pages15
JournalACS Sustainable Chemistry and Engineering
Volume8
Issue number40
DOIs
Publication statusPublished - 2020 Oct 12

Keywords

  • Cell configuration
  • Lithium-sulfur batteries
  • MoO-carbon nanotube composite
  • Polysulfide shuttle effect
  • Separator modification

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Renewable Energy, Sustainability and the Environment

Fingerprint

Dive into the research topics of 'Separators Modified Using MoO<sub>2</sub>@Carbon Nanotube Nanocomposites as Dual-Mode Li-Polysulfide Anchoring Materials for High-Performance Anti-Self-Discharge Lithium-Sulfur Batteries'. Together they form a unique fingerprint.

Cite this