Ion Selective Covalent Organic Framework Enabling Enhanced Electrochemical Performance of Lithium-Sulfur Batteries

Yu Cao, Hong Wu, Gang Li, Cheng Liu, Li Cao, Yiming Zhang, Wei Bao, Huili Wang, Yuan Yao, Shuo Liu, Fusheng Pan, Zhongyi Jiang, Jie Sun

Research output: Contribution to journalArticlepeer-review

115 Scopus citations

Abstract

Ion selective separators with the capability of conducting lithium ion and blocking polysulfides are critical and highly desired for high-performance lithium-sulfur (Li-S) batteries. Herein, we fabricate an ion selective film of covalent organic framework (denoted as TpPa-SO3Li) onto the commercial Celgard separator. The aligned nanochannels and continuous negatively charged sites in the TpPa-SO3Li layer can effectively facilitate the lithium ion conduction and meanwhile significantly suppress the diffusion of polysulfides via the electrostatic interaction. Consequently, the TpPa-SO3Li layer exhibits excellent ion selectivity with an extremely high lithium ion transference number of 0.88. When using this novel functional layer, the Li-S batteries with a high sulfur loading of 5.4 mg cm-2 can acquire a high initial capacity of 822.9 mA h g-1 and high retention rate of 78% after 100 cycles at 0.2 C. This work provides new insights into developing high-performance Li-S batteries via ion selective separator strategy.
Original languageEnglish (US)
Pages (from-to)2997-3006
Number of pages10
JournalNano Letters
Volume21
Issue number7
DOIs
StatePublished - Apr 14 2021
Externally publishedYes

ASJC Scopus subject areas

  • Bioengineering
  • General Materials Science
  • General Chemistry
  • Mechanical Engineering
  • Condensed Matter Physics

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