Polyolefin-Based Janus Separator for Rechargeable Sodium Batteries

Publisher:
Wiley
Publication Type:
Journal Article
Citation:
Angewandte Chemie, 2020, 132, (38), pp. 16868-16877
Issue Date:
2020-09-14
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© 2020 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim 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.
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