Biopolymer separators from polydopamine-functionalized bacterial cellulose for lithium-sulfur batteries

Rishav Baranwal, Xueyan Lin, Wenyue Li, Xuan Pan, Shu Wang, Zhaoyang Fan

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

The advancement of the lithium-sulfur (Li-S) batteries is immensely impeded by two main challenges: polysulfide shuttling between the electrodes and Li dendrite formation associated with the Li-metal anode. To tackle these challenges, we synthesized a polydopamine coated bacterial cellulose (PDA@BC) separator in a way to create physical and chemical traps for the shuttling polysulfides and to control the Li+ flux. While nanocellulose offers its dense network as a physical trap, the presence of polydopamine in the separator offers polar functional groups which not only has a high binding energy towards the polysulfides but also helps in redistribution of the Li+ ions across it. The electrochemical and physiochemical results suggest that the synthesized separator can have practical applicability owing to its superior performance compared to a commercial separator. The Li-S batteries assembled with this separator showed a specific discharge capacity of 1449 mAh/g at 0.1C and 877 mAh/g at 1C, and a capacity fade of 0.03 % per cycle over 650 cycles at 1C. Using a PDA@BC separator, a practical Li-S battery cell with S loading of 7.5 mg cm−2 (and E/S ratio of 10 µLmg−1, 82 % S ratio) was also tested at 1C, which delivered a capacity of ∼ 6 mAh cm−2 for 500 cycles.

Original languageEnglish (US)
Pages (from-to)556-565
Number of pages10
JournalJournal of Colloid And Interface Science
Volume656
DOIs
StatePublished - Feb 15 2024

Keywords

  • Bacterial cellulose
  • Battery separator
  • Li-metal battery
  • Lithium sulfur battery
  • Polydopamine

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

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