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Ionic Crystal Structures02:42

Ionic Crystal Structures

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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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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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An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
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Ionic Bonding and Electron Transfer02:48

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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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Lattice Energy 
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Chemical substances interact in many different ways. Certain chemical reactions exhibit common patterns of reactivity. Due to the vast number of chemical reactions, it becomes necessary to classify them based on the observed patterns of interaction.
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LaCl3-based sodium halide solid electrolytes with high ionic conductivity for all-solid-state batteries.

Chengyu Fu1, Yifan Li2, Wenjie Xu3,4

  • 1School of Materials Science and Engineering, Hefei University of Technology, Hefei, 230009, Anhui, China.

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|May 21, 2024
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A new LaCl3-based sodium conductor (Na1-xZrxLa1-xCl4) shows high ionic conductivity and stability for solid-state batteries. This material enables high performance in all-solid-state batteries, crucial for next-generation energy storage.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-State Chemistry

Background:

  • High-performance all-solid-state batteries require catholytes with excellent ionic conductivity, compressibility, and oxidative stability.
  • Current limitations in catholyte materials hinder the efficiency and longevity of solid-state energy storage devices.

Purpose of the Study:

  • To synthesize and characterize a novel LaCl3-based Na+ superionic conductor for use as a catholyte in all-solid-state batteries.
  • To investigate the structural and ionic transport properties of the synthesized material and its impact on battery performance.

Main Methods:

  • Solid-state reaction combined with mechanochemical methods for material synthesis.
  • X-ray diffraction (XRD) for structural analysis.
  • First-principle calculations and X-ray absorption fine structure (XAFS) for understanding ionic conductivity mechanisms.

Main Results:

  • A hexagonal Na1-xZrxLa1-xCl4 phase with high ionic conductivity (2.9 × 10-4 S cm-1 at 30°C) and high oxidative potential (3.80 V vs. Na2Sn) was successfully prepared.
  • Na+ ions form one-dimensional diffusion channels along the c-axis, with conductivity influenced by channel size and Na+/La3+ mixing.
  • All-solid-state batteries utilizing this material as a catholyte demonstrated an initial capacity of 114 mAh g-1 and 88% retention over 70 cycles at 0.3 C.

Conclusions:

  • The synthesized LaCl3-based Na+ superionic conductor exhibits promising properties for high-performance all-solid-state batteries.
  • The material's structure and ionic transport mechanisms are well-defined, offering a pathway for further optimization.
  • The demonstrated battery performance indicates the potential of this material for practical energy storage applications.