Multifunctional Separator with Porous Carbon/Multi-Walled Carbon Nanotube Coating for Advanced Lithium−Sulfur Batteries

Lei Tan, Xinhai Li, Zhixing Wang, Huajun Guo, Jiexi Wang, Liang An

Research output: Journal article publicationJournal articleAcademic researchpeer-review

23 Citations (Scopus)

Abstract

An issue associated with lithium−sulfur (Li−S) batteries is polysulfide dissolution, leading to the serious crossover of polysulfide to the Li anode. To address this issue, we report on a multifunctional separator prepared by introducing a porous carbon/multi-walled carbon nanotube (PC/MWCNT) composite into a commercial separator. It shows that the PC/MWCNT composite is able to enhance the interfacial interaction between the coating and the polysulfide and provides a large surface area for absorbing the polysulfide, thus improving the electrical conductivity. It has been demonstrated that the Li−S cell constructed with the PC/MWCNT composite separator results in a reversible capacity as high as 659 mAh g −1 after 200 cycles at 0.5 C, and the average capacity fading rate of the cell is about 0.138 % per cycle. The performance improvement is attributed to a reduction in the crossover rate of polysulfide through the composite separator as a result of the polysulfide absorption by PC/MWCNT layer.

Original languageEnglish
Pages (from-to)71-77
Number of pages7
JournalChemElectroChem
Volume5
Issue number1
DOIs
Publication statusPublished - 1 Jan 2018

Keywords

  • lithium−sulfur batteries
  • multifunctional separators
  • polysulfides
  • porous carbon

ASJC Scopus subject areas

  • Catalysis
  • Electrochemistry

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