Polyolefin-Based Janus Separator for Rechargeable Sodium Batteries

Dong Zhou, Xiao Tang, Xin Guo, Peng Li, Devaraj Shanmukaraj, Hao Liu, Xiaochun Gao, Yizhou Wang, Teofilo Rojo*, Michel Armand*, Guoxiu Wang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

85 Scopus citations


Rechargeable sodium batteries are a promising technology for low-cost energy storage. However, the undesirable drawbacks originating from the use of glass fiber membrane separators have long been overlooked. A versatile grafting–filtering strategy was developed to controllably tune commercial polyolefin separators for sodium batteries. The as-developed Janus separators contain a single–ion-conducting polymer-grafted side and a functional low-dimensional material coated side. When employed in room-temperature sodium–sulfur batteries, the poly(1-[3-(methacryloyloxy)propylsulfonyl]-1-(trifluoromethanesulfonyl)imide sodium)-grafted side effectively enhances the electrolyte wettability, and inhibits polysulfide diffusion and sodium dendrite growth. Moreover, a titanium-deficient nitrogen-containing MXene-coated side electrocatalytically improved the polysulfide conversion kinetics. The as-developed batteries demonstrate high capacity and extended cycling life with lean electrolyte loading.

Original languageEnglish (US)
Pages (from-to)16725-16734
Number of pages10
JournalAngewandte Chemie - International Edition
Issue number38
StatePublished - Sep 14 2020


  • dendrite growth
  • Janus separators
  • Na-S batteries
  • nitrogen-containing MXene
  • sodium-ion conducting

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)


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