An Anionic-MOF-Based Bifunctional Separator for Regulating Lithium Deposition and Suppressing Polysulfides Shuttle in Li–S Batteries

Ziqi Wang, Weiyuan Huang, Jiachuan Hua, Yidi Wang, Haocong Yi, Wenguang Zhao, Qinghe Zhao, Hao Jia, Bin Fei, Feng Pan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

30 Citations (Scopus)

Abstract

Lithium–sulfur (Li–S) batteries have been regarded as a promising energy-storage system owing to their high theoretical energy density of 2600 Wh kg−1 and low cost of raw materials. However, the dendrite issue of Li metal anodes and the shuttle effect of polysulfides severely plague the safety and cycling stability of Li–S batteries. To address these problems, a novel nanoporous battery separator (MMMS) is designed based on an anionic metal–organic framework (MOF) UiO-66-SO3Li and poly(vinylidene fluoride) (PVDF) following a mixed-matrix membrane approach. Benefitting from the well-defined anionic Li+ transport tunnels across the MMMS, a homogeneous Li deposition is achieved to stabilize the plating/stripping cycling over 1000 h at a high current density of 5 mA cm−2. Moreover, these tunnels featuring anionic electrostatic repulsion and a proper aperture size also demonstrate strong suppression to polysulfide shuttle and promote the redox activity and utilization of sulfur cathode material. With the MMMS to simultaneously promote the performance of Li metal anode and sulfur cathode, the Li–S battery delivers an elevated charge/discharge rate up to 5 C (552 mAh g−1) as well as a low capacity fading (0.056% per cycle at its steady stage) over 500 cycles at 0.5 C.

Original languageEnglish
Article number2000082
JournalSmall Methods
Volume4
Issue number7
DOIs
Publication statusPublished - 1 Jul 2020

Keywords

  • battery separators
  • lithium metal anodes
  • lithium–sulfur batteries
  • metal–organic frameworks
  • polysulfides

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)

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