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Adaptive Hydration Chemistry Enables Fast and Durable Zinc-Ion Batteries.

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A novel strategy using 2-picolinaldehyde (2PA) as a reversible hydration modulator (RHM) enhances aqueous zinc-ion battery (AZIB) stability. This approach dynamically controls interfacial water, improving anode performance and ion transport for reliable large-scale energy storage.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Aqueous zinc-ion batteries (AZIBs) are promising for large-scale energy storage.
  • Uncontrolled interfacial water in AZIBs hinders anode stability and ion transport.

Purpose of the Study:

  • To develop a novel strategy for dynamic regulation of interfacial water in AZIBs.
  • To improve anode stability and ion transport by modulating water at the electrode-electrolyte interface.

Main Methods:

  • Utilized 2-picolinaldehyde (2PA) as a reversible hydration modulator (RHM).
  • Employed spectroscopic and computational analyses to understand RHM's mechanism.
  • Fabricated and tested symmetric and full AZIB cells with RHM-modified electrolytes.

Main Results:

  • RHM dynamically regulates interfacial water, suppressing hydrogen evolution and corrosion during plating.
  • RHM facilitates Zn2+ solvation and migration during stripping by releasing water.
  • Symmetric cells achieved over 4000 hours of cycling; full cells operated over 5000 cycles.
  • Demonstrated low voltage polarization even at high current densities (20 mA cm-2).

Conclusions:

  • The RHM strategy provides adaptive interfacial water management for AZIBs.
  • Achieved enhanced interfacial stability and efficient ion transport.
  • Presents a novel approach for designing advanced AZIB electrolytes for energy storage.