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Hydrogen/Electron Amphiphilic Bi-Functional Water Molecular Inactivator-Assisted Interface Stabilization in Highly

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Summary

1,5-Pentanediol stabilizes aqueous zinc metal batteries by inhibiting water activity and promoting uniform zinc deposition. This enhances interfacial stability, enabling over 5600 hours of stable cycling in Zn//Zn cells.

Keywords:
Active-waterCathode dissolutionElectrode/electrolyte interfaceElectron and proton affinitySEI

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Energy Storage

Background:

  • Aqueous zinc metal batteries (AZMBs) suffer from side reactions due to continuous hydrogen-bond networks and parasitic electron consumption.
  • Uncontrolled hydrogen transfer and interfacial instability limit the performance and lifespan of AZMBs.

Purpose of the Study:

  • To stabilize the electrode/electrolyte interface in AZMBs.
  • To suppress side reactions and improve the cycling performance of AZMBs.

Main Methods:

  • Introduction of 1,5-Pentanediol (PD), a hydrogen/electron amphiphilic molecule, to the electrolyte.
  • Investigating the effect of PD on water activity, Zn2+ solvation, and electrode deposition.
  • Formation of protective layers at both anode and cathode interfaces.

Main Results:

  • PD breaks the bulk-water hydrogen-bond network, reducing water activity and enhancing electron acceptance.
  • PD optimizes Zn2+ de-solvation, leading to uniform zinc deposition and a stable anode-electrolyte interface.
  • Stable cycling of Zn//Zn symmetric cells for over 5600 hours at 1 mAh cm-2 and 250 hours at 50°C.
  • Stable cycling performance for VO2 and I2 cathodes, with a pouch cell achieving 0.13 Ah capacity.

Conclusions:

  • 1,5-Pentanediol effectively stabilizes AZMBs by addressing interfacial issues and improving electrode deposition.
  • The developed strategy significantly enhances the cycling stability and performance of aqueous zinc metal batteries.