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Polyolefin-Based Janus Separator for Rechargeable Sodium Batteries.

Dong Zhou1, Xiao Tang1, Xin Guo1

  • 1Centre for Clean Energy Technology, School of Mathematical and Physical Sciences, University of Technology Sydney, Sydney, NSW, 2007, Australia.

Angewandte Chemie (International Ed. in English)
|June 12, 2020
PubMed
Summary

Researchers developed advanced Janus separators for rechargeable sodium batteries. These separators improve electrolyte wetting, block polysulfide leakage, and prevent sodium dendrite growth, enhancing battery performance and lifespan.

Keywords:
Janus separatorsNa-S batteriesdendrite growthnitrogen-containing MXenesodium-ion conducting

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Rechargeable sodium batteries offer a low-cost energy storage solution.
  • Traditional glass fiber separators in sodium batteries present limitations.
  • Developing advanced separators is crucial for enhancing battery performance.

Purpose of the Study:

  • To develop a versatile grafting-filtering strategy for tuning polyolefin separators.
  • To create Janus separators with tailored functionalities for sodium batteries.
  • To improve the performance and stability of room-temperature sodium-sulfur batteries.

Main Methods:

  • Utilized a grafting-filtering strategy to modify commercial polyolefin separators.
  • Developed Janus separators with a single-ion-conducting polymer-grafted side and a functional MXene-coated side.
  • Investigated the performance of these separators in room-temperature sodium-sulfur batteries.

Main Results:

  • The polymer-grafted side enhanced electrolyte wettability and inhibited polysulfide diffusion and sodium dendrite growth.
  • The MXene-coated side electrocatalytically improved polysulfide conversion kinetics.
  • Batteries with Janus separators demonstrated high capacity and extended cycling life, even with lean electrolyte loading.

Conclusions:

  • The developed Janus separators effectively address limitations of conventional separators in sodium batteries.
  • This strategy offers a versatile approach for designing advanced separators for high-performance sodium batteries.
  • The findings pave the way for more efficient and cost-effective sodium-based energy storage systems.