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High-Performance Zinc-Bromine Rechargeable Batteries Enabled by In-Situ Formed Solid Electrolyte Interphase.

Norah S Alghamdi1,2,3, Xiyue Peng1, Xingchen Yang1

  • 1Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD, 4072, Australia.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|September 29, 2025
PubMed
Summary

Researchers developed a new coating for graphite current collectors to create a protective layer in aqueous zinc-bromine batteries (ZBBs). This strategy effectively suppresses zinc dendrites and water decomposition, significantly improving battery performance and lifespan.

Keywords:
aqueous electrolytehydrogen evolution reactionsolid electrolyte interphasezinc dendriteszinc–bromine batteries

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Aqueous zinc-bromine batteries (ZBBs) are attractive for renewable energy storage.
  • Challenges like zinc dendrites and water decomposition limit ZBB cycle life and efficiency.

Purpose of the Study:

  • To develop a facile strategy for enhancing ZBB performance.
  • To suppress dendrite formation and water decomposition in ZBBs.

Main Methods:

  • Coating graphite current collectors with a hydrophobic perfluoropolyether interlayer.
  • In-situ formation of a fluorinated solid electrolyte interphase (SEI) during charging.
  • Characterization of SEI properties and battery performance.

Main Results:

  • Fluoride-rich SEI formation regulates zinc nucleation and suppresses dendrites.
  • SEI inhibits hydrogen evolution by limiting water access.
  • Reduced potential hysteresis (285 to 60 mV), energy density of 20 Wh L⁻¹, areal capacity of 10.7 mAh cm⁻².
  • Maintained >79% energy efficiency over 1000 cycles.

Conclusions:

  • The fluorinated SEI strategy offers a scalable approach for high-performance ZBBs.
  • This advancement contributes to next-generation anode-free zinc batteries.
  • Improved cycle life and energy efficiency were achieved.