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Updated: Dec 21, 2025
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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
Published on: March 24, 2018
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Origin of Superionic Li3Y1-InCl6 Halide Solid Electrolytes with High Humidity Tolerance
Xiaona Li1, Jianwen Liang1, Keegan R Adair1
1Department of Mechanical and Materials Engineering, University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 3K7, Canada.
Nano Letters
|May 15, 2020
Summary
This study reveals how metal atom choice in Li3MX6 solid-state electrolytes influences structure and performance. Higher indium content improves humidity stability and lithium-ion conductivity in halide electrolytes.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Electrochemistry
Background:
- Li3MX6 solid-state electrolytes (SSEs) show promise for high ionic conductivity and stability.
- Halide SSEs often degrade irreversibly in humid conditions due to hydrolysis.
- Understanding the role of the M atom is crucial for designing stable SSEs.
Purpose of the Study:
- To investigate the function of the M atom in Li3MX6 SSEs.
- To correlate composition, structure, ion migration, and humidity stability.
- To provide insights for developing new halide-based SSEs.
Main Methods:
- Synthesis and characterization of a series of Li3Y1-xInxCl6 solid solutions.
- Structural analysis to track anion arrangement changes (hcp to ccp).
- Evaluation of ionic conductivity and humidity tolerance.
Main Results:
- Increasing indium content induced a structural transition from hexagonal-closed-packed (hcp) to cubic-closed-packed (ccp) anion arrangements.
- SSEs with ccp anion sublattices exhibited enhanced Li+ migration.
- High indium content improved humidity tolerance through hydrated intermediate formation.
Conclusions:
- The M atom's identity significantly impacts the structure and properties of Li3MX6 SSEs.
- A ccp anion sublattice is favorable for high Li+ conductivity.
- Strategic doping can enhance humidity stability, paving the way for practical halide SSEs.
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