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Polyolefin‐Based Janus Separator for Rechargeable Sodium Batteries
Author(s) -
Zhou Dong,
Tang Xiao,
Guo Xin,
Li Peng,
Shanmukaraj Devaraj,
Liu Hao,
Gao Xiaochun,
Wang Yizhou,
Rojo Teofilo,
Armand Michel,
Wang Guoxiu
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202007008
Subject(s) - polyolefin , polysulfide , separator (oil production) , electrolyte , chemical engineering , sodium , materials science , janus , wetting , chemistry , nanotechnology , composite material , metallurgy , layer (electronics) , electrode , physics , engineering , thermodynamics
Abstract 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.