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Highly Reversible Zn Anode Design Through Oriented ZnO(002) Facets.

Chengwu Yang1,2, Pattaraporn Woottapanit1, Sining Geng2

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Advanced Materials (Deerfield Beach, Fla.)
|October 21, 2024
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Summary

Researchers developed a novel ZnO(002)@Zn anode to overcome dendrite growth and side reactions in aqueous zinc-ion batteries. This innovation significantly improves cycling stability and Coulombic efficiency for advanced battery applications.

Keywords:
Zn anodeZn ion batteriesZnO (002) lattice planehydrogen evolution suppressionzincophilicity

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Aqueous zinc-ion batteries face challenges like dendrite growth, side reactions, and poor zinc utilization.
  • These issues hinder the practical implementation and long-term stability of zinc metal anodes.

Purpose of the Study:

  • To design and synthesize a modified zinc anode that enhances stability and efficiency in aqueous zinc-ion batteries.
  • To address key limitations including dendrite formation and suboptimal zinc deposition.

Main Methods:

  • Fabrication of a highly oriented ZnO(002) lattice plane on a zinc anode (ZnO(002)@Zn).
  • Utilized theoretical calculations and experimental validation to assess anode performance.
  • Tested the modified anode in coin cells and pouch cells with V2O5 cathodes.

Main Results:

  • The ZnO(002)@Zn anode demonstrated high zinc affinity, suppressed hydrogen evolution, and enabled dendrite-free zinc deposition.
  • Achieved a stable cycling lifespan over 500 hours with 99.7% average Coulombic efficiency, even at 85.6% depth of discharge.
  • Demonstrated high discharge capacity and exceptional cycling stability in both coin and pouch cell configurations.

Conclusions:

  • The ZnO(002)@Zn anode effectively mitigates major challenges in aqueous zinc-ion batteries.
  • This approach offers a promising strategy for developing robust and high-performance zinc metal anodes.
  • Advances the prospects for practical and widespread adoption of aqueous zinc-ion battery technology.