WO3 Nanowire/Carbon Nanotube Interlayer as a Chemical Adsorption Mediator for High-Performance Lithium-Sulfur Batteries

Molecules. 2021 Jan 13;26(2):377. doi: 10.3390/molecules26020377.

Abstract

We developed a new nanowire for enhancing the performance of lithium-sulfur batteries. In this study, we synthesized WO3 nanowires (WNWs) via a simple hydrothermal method. WNWs and one-dimensional materials are easily mixed with carbon nanotubes (CNTs) to form interlayers. The WNW interacts with lithium polysulfides through a thiosulfate mediator, retaining the lithium polysulfide near the cathode to increase the reaction kinetics. The lithium-sulfur cell achieves a very high initial discharge capacity of 1558 and 656 mAh g-1 at 0.1 and 3 C, respectively. Moreover, a cell with a high sulfur mass loading of 4.2 mg cm-2 still delivers a high capacity of 1136 mAh g-1 at a current density of 0.2 C and it showed a capacity of 939 mAh g-1 even after 100 cycles. The WNW/CNT interlayer maintains structural stability even after electrochemical testing. This excellent performance and structural stability are due to the chemical adsorption and catalytic effects of the thiosulfate mediator on WNW.

Keywords: interlayer; lithium-sulfur batteries; thiosulfate mediator; tungsten oxide nanowire.

MeSH terms

  • Adsorption
  • Electric Power Supplies*
  • Lithium / chemistry*
  • Nanotubes, Carbon / chemistry*
  • Nanowires / chemistry*
  • Oxides / chemistry*
  • Particle Size
  • Sulfur / chemistry*
  • Surface Properties
  • Tungsten / chemistry*

Substances

  • Nanotubes, Carbon
  • Oxides
  • Sulfur
  • tungsten oxide
  • Lithium
  • Tungsten