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Grain-Oriented Dissolution Enabled by Hydrogel for Highly Reversible Zn Anodes.

Zixing Dong1, Shige Wang2,3, Jiashu Chen4

  • 1Institute of Energy Materials Science (IEMS), University of Shanghai for Science and Technology, Shanghai, P. R. China.

Angewandte Chemie (International Ed. in English)
|May 8, 2026
PubMed
Summary

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This summary is machine-generated.

Researchers developed a novel hydrogel to control zinc anode behavior, enabling grain-oriented dissolution. This strategy significantly enhances zinc anode reversibility and stability in batteries, even at low temperatures.

Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Zinc anodes suffer from poor reversibility due to dendritic growth and hydrogen evolution.
  • Grain-oriented stripping is a promising but underexplored strategy to improve zinc anode performance.
  • Understanding the mechanism of grain-oriented dissolution is crucial for developing stable zinc batteries.

Purpose of the Study:

  • To design a multifunctional hydrogel for dynamic anode interface regulation.
  • To achieve and elucidate the mechanism of grain-oriented zinc dissolution.
  • To enhance the cycling stability and reversibility of zinc anodes.

Main Methods:

  • Fabrication of a composite hydrogel using aramid nanofiber-polyvinyl alcohol (ANF-PVA) and calcium lignosulfonate (LS).
Keywords:
Zn anodesZn‐ion batteriesgrain‐oriented strippinghydrogel electrolyteuniform deposition

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  • In situ characterization of the anode-electrolyte interface.
  • Electrochemical testing of Zn||Zn symmetric cells and Zn||I2 full cells under various conditions.

    • Main Results:

    • The ANF-PVA-LS hydrogel promoted homogeneous electric field distribution and selective adsorption of LS onto Zn crystal planes.
    • Grain-oriented zinc dissolution was successfully achieved, leading to uniform Zn deposition and suppressed side reactions.
    • Zn||Zn symmetric cells demonstrated remarkable cycling stability (5000 h at ambient, 10900 h at -40 °C).
    • Zn||I2 full cells showed high capacity retention (78.2% after 20,000 cycles), and pouch-type cells sustained 700 cycles.

    Conclusions:

    • The synergistic effect of ANF-PVA and LS enables controlled grain-oriented dissolution of zinc anodes.
    • This approach significantly improves the reversibility and long-term stability of zinc anodes in energy storage devices.
    • The developed hydrogel strategy offers a new pathway for high-performance and reliable zinc-based batteries.