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Area of Science:

  • Electrochemistry
  • Materials Science
  • Energy Storage

Background:

  • Aqueous zinc-ion batteries face challenges like anode corrosion, hydrogen evolution, and dendrite growth.
  • Stabilizing the zinc anode interface is crucial for battery longevity and safety.

Purpose of the Study:

  • To introduce tetraethylammonium perchlorate (TEACC) as a ferroelectric additive to improve aqueous zinc-ion battery performance.
  • To investigate the mechanism by which TEACC modifies the electrode-electrolyte interface and suppresses detrimental reactions.

Main Methods:

  • Electrochemical testing of zinc anodes with TEACC additive in aqueous electrolytes.
  • Analysis of interfacial structure and solid electrolyte interphase (SEI) formation.
  • Evaluation of full cells and flexible pouch cells for practical applications.

Main Results:

  • TEACC creates a water-deficient interface, shifting the hydrogen evolution potential and suppressing water activity.
  • Formation of a stable SEI (ZnCO3, ZnCl2, ZnS) promotes reversible zinc plating/stripping with >99.5% coulombic efficiency.
  • Ferroelectric properties of TEACC homogenize ion distribution, suppressing dendrites and reducing nucleation overpotential by 35 mV.
  • Full cells achieved 92.94% capacity retention after 380 cycles and demonstrated excellent rate capability.
  • Flexible pouch cells successfully powered multiple LED indicators.

Conclusions:

  • TEACC effectively stabilizes the zinc anode interface in aqueous electrolytes.
  • Ferroelectric molecular additives offer a promising strategy for advanced aqueous battery systems.
  • The developed system shows potential for flexible and high-performance energy storage devices.