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Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

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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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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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Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

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Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
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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.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
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Valence Bond Theory02:42

Valence Bond Theory

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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Crystal Field Theory
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Triggering dynamically disordered lithium sublattice in superionic conductors.

Chaohong Guan1,2, Jiawei Zong3,4,5, Jiacong Li4,6

  • 1University of Michigan-Shanghai Jiao Tong University Joint Institute, Shanghai Jiao Tong University, Shanghai, China.

Nature Communications
|March 31, 2026
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Summary
This summary is machine-generated.

Harnessing flexible polyanion rotations in superionic conductors enhances lithium-ion conductivity. This dynamic approach, guided by a rotation tolerance factor, enables faster ion transport and improved battery performance.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Electrochemistry

Background:

  • Superionic conductor design traditionally emphasizes static structures, overlooking dynamic ion transport mechanisms.
  • Understanding dynamic processes is crucial for optimizing ionic conductivity in crystalline materials.
  • Polyanion rotations offer a novel pathway to influence cation mobility and sublattice disorder.

Purpose of the Study:

  • To explore a new paradigm for superionic conductor design by utilizing polyanion rotations.
  • To develop a predictive metric, the rotation tolerance factor, for identifying suitable materials.
  • To demonstrate enhanced ionic conductivity through synergistic effects of polyanion rotation and sublattice disorder.

Main Methods:

  • Proposed a 'rotation tolerance factor' descriptor to predict fast-rotating anion clusters.
  • Designed novel halide and oxide materials incorporating rotational polyanions (e.g., SH⁻, NH₂⁻).
  • Synthesized and characterized materials, including NH₂⁻ incorporated Li₂ZrCl₅.₉₂(NH₂)₀.₀₈, and tested their ionic conductivity and battery performance.

Main Results:

  • Designed materials with synergistic polyanion rotation and Li⁺ sublattice disorder exhibit enhanced room-temperature Li ionic conductivity.
  • The synthesized NH₂⁻ incorporated material showed a four-fold increase in conductivity compared to its control.
  • All-solid-state batteries utilizing the new material demonstrated high capacity retention over 190 cycles.

Conclusions:

  • Flexible polyanion rotations are a key factor in promoting dynamically disordered lithium sublattices.
  • This dynamic approach significantly enhances ionic conductivity in superionic conductors.
  • The findings offer a new strategy for designing advanced solid electrolytes for high-performance batteries.