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Molecular and Ionic Solids02:54

Molecular and Ionic Solids

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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
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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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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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The ionic strength of a solution is a quantitative way of expressing the total electrolyte concentration of a solution. This concept was first introduced in 1921 by two American physical chemists, Gilbert N. Lewis and Merle Randall, while describing the activity coefficient of strong electrolytes. During the calculation of ionic strength (I or μ), all the cations and anions are considered. However, the concentration (c) of an ion with a greater charge number (z) has a greater contribution...
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Overview
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Tuning collective anion motion enables superionic conductivity in solid-state halide electrolytes.

Zhantao Liu1, Po-Hsiu Chien2, Shuo Wang3

  • 1George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA, USA.

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Researchers discovered that anion motion drives superionic transitions in Li3MX6 solid electrolytes. This finding enabled the design of new materials with improved ionic conductivity for advanced solid-state lithium-ion batteries.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Electrochemistry

Background:

  • Li3MX6 halides are promising solid electrolytes for solid-state Li-ion batteries.
  • They offer better chemical and electrochemical stability than sulfides but lower ionic conductivity.
  • Understanding their ionic transport mechanisms is crucial for material design.

Purpose of the Study:

  • To elucidate the mechanism of superionic transitions in Li3MX6 materials.
  • To develop a rational design strategy for enhancing room-temperature ionic conductivity.
  • To discover new superionic conductors for high-performance batteries.

Main Methods:

  • Synchrotron X-ray and neutron scattering characterizations.
  • Ab initio molecular dynamics simulations.
  • Rational design and synthesis of halide solid electrolytes.

Main Results:

  • The superionic transition in Li3YCl6 is triggered by collective anion motion.
  • A rational design strategy successfully lowered the transition temperature.
  • Synthesized Li3YCl4.5Br1.5 and Li3GdCl3Br3 achieved high room-temperature conductivities (6.1 and 11 mS cm−1).

Conclusions:

  • Collective anion motion is key to superionic conductivity in Li3MX6 halides.
  • This understanding facilitates the design of superior solid electrolytes.
  • New halide materials show potential for high-performance solid-state batteries.