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Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature

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Synergistic Ion-Solvent Modulation Derived Robust Multiphase Solid Electrolyte Interphases for High-Rate and

Jinlong Zhang¹, Xiude Liu¹, Yifei Zhang¹

¹Department of Polymeric Materials & Engineering, College of Materials & Metallurgy, Guizhou University, Huaxi District, Guiyang 550025, China.

|July 7, 2026

Summary

Researchers developed a multiphase solid electrolyte interphase (SEI) for zinc-ion batteries (ZIBs). This novel SEI enhances zinc plating/stripping stability and utilization, paving the way for high-performance ZIBs.

Keywords:

Zn2+ kinetics high Zn utilization rate ion−solvent modulation solid electrolyte interphase zinc-ion batteries

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Area of Science:

Materials Science
Electrochemistry
Energy Storage

Background:

Conventional single-phase solid electrolyte interphases (SEIs) in zinc-ion batteries (ZIBs) exhibit limited mechanical and electrochemical stability.
This instability hinders reversible zinc plating/stripping and limits the overall performance and lifespan of ZIBs.

Purpose of the Study:

To engineer a multiphase SEI with improved stability for high-performance ZIBs.
To enable efficient and reversible zinc plating and stripping for enhanced zinc utilization.

Main Methods:

Synergistic ion-solvent modulation using 1-vinyl-3-ethylimidazolium tetrafluoroborate (VElmBF4).
Construction and characterization of a multiphase SEI.
Electrochemical testing of Zn||Zn and Zn||Cu asymmetric cells.

Main Results:

The multiphase SEI demonstrated enhanced mechanical and electrochemical stability.
Zn||Zn cells achieved ultralong rate capability (>2500 h) and plating/stripping lifespan (>4000 h) with high zinc utilization.
Zn||Cu asymmetric cells exhibited high average Coulombic efficiency (99.86%) over 900 cycles.

Conclusions:

The developed multiphase SEI effectively enables reversible Zn2+ plating/stripping and high zinc utilization.
This approach offers a promising strategy for advancing the performance and durability of zinc-ion batteries.