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Rationalized Electroepitaxy toward Scalable Single-Crystal Zn Anodes.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Battery Technology

Background:

  • Electroepitaxy is effective for reversible metal electrodes but faces challenges in large-scale application due to complex interfacial chemistry.
  • Developing scalable methods for high-performance metal anodes is crucial for advanced energy storage.

Purpose of the Study:

  • To demonstrate the feasibility of extending zinc electroepitaxy to bulk phases on mass-produced copper substrates.
  • To overcome interfacial issues like alloy formation and electroosmosis in zinc electrodeposition.
  • To enable the development of high-end metal electrodes for batteries.

Main Methods:

  • Utilized a potentiostatic electrodeposition protocol to circumvent interfacial Cu-Zn alloy and turbulent electroosmosis.
  • Prepared mono-oriented Cu(111) foil as a substrate for zinc electroepitaxy.
  • Tested symmetric cells with the prepared Zn single-crystalline anode at a high current density (50.0 mA cm⁻²).

Main Results:

  • Successfully demonstrated Zn electroepitaxy on a bulk scale using a Cu(111) foil.
  • Achieved stable cycling of symmetric cells with the Zn anode at 50.0 mA cm⁻².
  • The full cell exhibited 95.7% capacity retention over 1500 cycles at 5.0 A g⁻¹ with a low N/P ratio of 7.5.
  • Successfully applied the same approach for Ni electroepitaxy.

Conclusions:

  • A potentiostatic electrodeposition protocol enables scalable Zn electroepitaxy, overcoming interfacial limitations.
  • The developed method produces high-performance Zn anodes suitable for demanding battery applications.
  • This approach is extendable to other metals like Ni, offering a pathway for designing advanced metal electrodes.