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Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions. 
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Related Experiment Video

Updated: May 20, 2025

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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Z-Type Interstice Leap Migration Driving High Ionic Conductivity in Monoclinic LiBiBr4 Solid State Electrolyte.

Yu Chao1, Sisheng Yang1, Chenyuan Xu1

  • 1Key Laboratory of Advanced Materials Technologies, International (Hong Kong Macao and Taiwan) Joint Laboratory on Advanced Materials Technologies, College of Materials Science and Engineering, Fuzhou University, Fuzhou, Fujian, 350108, China.

Small (Weinheim an Der Bergstrasse, Germany)
|March 24, 2025
PubMed
Summary
This summary is machine-generated.

A new bromide solid electrolyte, LiBiBr₄, demonstrates superior processing and high ionic conductivity. Its unique Z-type leap migration pathway facilitates efficient ion transport, advancing halogen-based electrolyte development.

Keywords:
LiBiBr4lithium Ion batteriesmigration pathsolid‐state electrolyte

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-State Chemistry

Background:

  • Halide solid electrolytes are crucial for advanced electrochemical applications due to their high ionic conductivity and stability.
  • Existing chloride electrolytes often require high processing pressures, limiting their practical application.

Purpose of the Study:

  • To design and investigate a novel bromide solid electrolyte, LiBiBr₄, for enhanced performance.
  • To compare LiBiBr₄ with LiAlCl₄ and LiAlBr₄ to understand ion migration mechanisms.
  • To elucidate the factors governing ionic conductivity in halide solid electrolytes.

Main Methods:

  • First-time design and synthesis of LiBiBr₄ solid electrolyte.
  • Comparative investigation with monoclinic LiAlCl₄ and LiAlBr₄.
  • Computational analysis of ion migration pathways and energy barriers.
  • Measurement of ionic conductivity and activation energy.

Main Results:

  • LiBiBr₄ requires significantly lower processing pressure (<1/10th) compared to chloride electrolytes.
  • Computational analysis revealed that the strategic positioning of the Bi polyhedron minimizes interference with Li⁺ pathways.
  • A unique Z-type interstice leap migration along the ab-axis was identified in LiBiBr₄, forming a 3D interstice network.
  • LiBiBr₄ achieved a high ionic conductivity of 0.19 mS cm⁻¹ with a low activation energy of 0.349 eV.

Conclusions:

  • LiBiBr₄ is a promising bromide solid electrolyte with facile processing and high ionic conductivity.
  • The identified leap migration mechanism and structural features are key to its superior performance.
  • This work provides a new avenue for developing efficient halogen-based solid electrolytes.