A trifunctional multi-walled carbon nanotubes/polyethylene glycol (MWCNT/PEG)-coated separator through a layer-by-layer coating strategy for high-energy Li-S batteries

Liu Luo, Sheng Heng Chung, Arumugam Manthiram

Research output: Contribution to journalArticlepeer-review

50 Citations (Scopus)

Abstract

A trifunctional separator fabricated by using a light-weight layer-by-layer multi-walled carbon nanotubes/polyethylene glycol (MWCNT/PEG) coating has been explored in lithium-sulfur (Li-S) batteries. The conductive MWCNT/PEG coating serves as (i) an upper current collector for accelerating the electron transport and benefiting the electrochemical reaction kinetics of the cell, (ii) a net-like filter for blocking and intercepting the migrating polysulfides through a synergistic effect including physical and chemical interactions, and (iii) a layered barrier for inhibiting the continuous diffusion and alleviating the volume change of the trapped active material by introducing a "buffer zone" in between the coated layers. The multi-layered MWCNT/PEG coating allows the use of the conventional pure sulfur cathode with a high sulfur content (78 wt%) and high sulfur loading (up to 6.5 mg cm-2) to achieve a high initial discharge capacity of 1206 mA h g-1 at C/5 rate, retaining a superior capacity of 630 mA h g-1 after 300 cycles. The MWCNT/PEG-coated separator optimized by the facile layer-by-layer coating method provides a promising and feasible option for advanced Li-S batteries with high energy density.

Original languageEnglish
Pages (from-to)16805-16811
Number of pages7
JournalJournal of Materials Chemistry A
Volume4
Issue number43
DOIs
Publication statusPublished - 2016 Jan 1

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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