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Triple-function Hydrated Eutectic Electrolyte for Enhanced Aqueous Zinc Batteries.

Yunpeng Zhong1, Xuesong Xie1, Zhiyuan Zeng2

  • 1School of Materials Science and Engineering, Hunan Provincial Key Laboratory of Electronic Packaging and Advanced Functional Materials, Central South University, Changsha, Hunan, 410083, P. R. China.

Angewandte Chemie (International Ed. in English)
|August 14, 2023
PubMed
Summary
This summary is machine-generated.

Tetramethylene sulfone (TMS) in hydrated eutectic electrolytes enhances aqueous rechargeable zinc-ion batteries by stabilizing cathodes and suppressing zinc anode dendrites. This novel approach enables a high specific capacity, advancing practical battery development.

Keywords:
Double Electric LayerElectrochemistryEutectic ElectrolyteHydrogen Bond NetworkZinc Battery

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Energy Storage

Background:

  • Aqueous rechargeable zinc-ion batteries (ARZBs) face challenges including cathode instability, electrolyte reactions, and zinc anode dendrites.
  • These issues limit the performance and lifespan of current ARZB technologies.

Purpose of the Study:

  • To develop a multi-functional electrolyte strategy to overcome the limitations of ARZBs.
  • To investigate the role of tetramethylene sulfone (TMS) in a hydrated eutectic electrolyte for improved battery performance.

Main Methods:

  • Introduction of tetramethylene sulfone (TMS) into a hydrated eutectic electrolyte.
  • Analysis of TMS interaction with water to reconstruct hydrogen bonds.
  • Investigation of TMS adsorption on the zinc anode to suppress dendrite growth.
  • Characterization of the Zn2+ solvation shell and the solvent co-intercalation mechanism.

Main Results:

  • TMS addition inhibited water activity and formed a protective layer on the zinc anode, suppressing dendrites.
  • A novel solvent co-intercalation mechanism ((Zn-TMS)2+) was observed, with TMS acting as a structural stabilizer for the cathode (NH4V4O10).
  • The optimized Zn||NVO battery achieved a high specific capacity of 515.6 mAh g-1 at 0.2 A g-1 for over 40 days.

Conclusions:

  • The multi-functional TMS-based electrolyte effectively addresses key challenges in ARZBs.
  • The solvent co-intercalation mechanism offers a new pathway for enhancing battery performance.
  • This work significantly contributes to the practical advancement of aqueous rechargeable zinc-ion batteries.