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Divalent anion-driven framework regulation in Zr-based halide solid electrolytes for all-solid-state batteries.

Jae-Seung Kim1, Daseul Han2, Jinyeong Choe1

  • 1Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Republic of Korea.

Nature Communications
|November 27, 2025
PubMed
Summary
This summary is machine-generated.

Researchers enhanced lithium-ion conductivity in halide solid electrolytes by introducing divalent anions. This modification optimizes lithium-ion pathways in zirconium-based materials for safer, high-performance all-solid-state batteries.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-State Chemistry

Background:

  • All-solid-state batteries require advanced solid electrolytes for improved safety and energy density.
  • Halide solid electrolytes offer high ionic conductivity and stability, but some, like Li₂ZrCl₆, have limited conductivity.
  • Enhancing ionic conductivity in cost-effective halide materials is crucial for practical battery applications.

Purpose of the Study:

  • To elucidate the mechanism of divalent-anion-driven framework modification for enhanced ionic conduction in Zr-based halide solid electrolytes.
  • To demonstrate improved Li⁺ conductivities in oxygen- and sulfur-substituted Zr-halide lattices.
  • To explore design strategies for regulating halide solid electrolyte frameworks.

Main Methods:

  • Synthesis of oxygen- and sulfur-substituted Li₂ZrCl₆ analogues (0.8Li₂O-ZrCl₄ and 0.8Li₂S-ZrCl₄).
  • Measurement of Li⁺ ionic conductivity using electrochemical impedance spectroscopy.
  • Synchrotron-based X-ray diffraction and absorption spectroscopy for structural analysis.
  • First-principles calculations to investigate structural distortions and Li-ion migration pathways.

Main Results:

  • Oxygen- and sulfur-substitution significantly enhanced Li⁺ ionic conductivity (1.78 mS cm⁻¹ and 1.01 mS cm⁻¹, respectively) compared to pristine Li₂ZrCl₆.
  • Divalent anions were observed to cluster within the lattice, inducing structural distortions and destabilizing Li-ion sites.
  • Calculations revealed widened lithium conduction channels and altered Li-Cl bonding, leading to a flattened energy landscape for Li⁺ migration.

Conclusions:

  • Divalent anion incorporation effectively regulates the framework of Zr-based halide solid electrolytes.
  • The observed structural modifications facilitate enhanced lithium-ion transport.
  • This study provides a fundamental understanding and design principles for developing advanced halide solid electrolytes for all-solid-state batteries.