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Hierarchically Structured Artificial SEI with Interlayer Electronic Coupling for High-Performance Aqueous Zinc

Ye Li1,2, Fangfei Li1,2, Jing Wen3

  • 1Key Laboratory of Automobile Materials of Ministry of Education, Changchun, China.

Small (Weinheim an Der Bergstrasse, Germany)
|February 9, 2026
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Summary

Engineered a novel artificial solid electrolyte interphase (SEI) layer for aqueous zinc-ion batteries (AZIBs). This advanced SEI layer enhances interfacial stability and ion transport, significantly improving battery performance and cycle life.

Keywords:
AZIBsMXeneZIF‐8ZnOdickite

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Aqueous zinc-ion batteries (AZIBs) offer safe and cost-effective large-scale energy storage.
  • Key challenges include dendrite formation, parasitic reactions, and unstable interfaces, hindering AZIB performance.

Purpose of the Study:

  • To develop a multifunctional artificial solid electrolyte interphase (SEI) layer for AZIBs.
  • To engineer an "armored petalosphere" heterostructure (ZnO@MX-DE) for improved interfacial stability and ionic conductivity.

Main Methods:

  • Constructed the ZnO@MX-DE heterostructure using ZIF-8 templating, MXene coating, ZnO conversion, and dickite nanosheet compositing.
  • Investigated interfacial electron reconstruction and ion transport properties of the engineered SEI layer.

Main Results:

  • The artificial SEI layer exhibited ultrahigh ionic conductivity (20.26 mS cm⁻¹) and Zn²⁺ transference number (0.89).
  • Achieved stable cycling over 4000 hours in Zn//Zn cells.
  • Demonstrated excellent capacity retention (77.10% after 700 cycles) in Zn//MnO₂ full cells, with remarkable longevity at high current densities.

Conclusions:

  • The engineered ZnO@MX-DE SEI layer effectively suppresses dendrite growth and parasitic reactions.
  • This interfacial engineering strategy promotes the development of high-performance and durable AZIBs for energy storage applications.