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Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

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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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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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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Valence Bond Theory

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Understanding Li diffusion in Li-intercalation compounds.

Anton Van der Ven1, Jishnu Bhattacharya, Anna A Belak

  • 1Department of Materials Science and Engineering, The University of Michigan , 2300 Hayward Street, Ann Arbor, Michigan 48109, United States.

Accounts of Chemical Research
|May 16, 2012
PubMed
Summary
This summary is machine-generated.

Lithium-ion battery electrode properties depend on crystal structure and lithium concentration. Understanding lithium diffusion mechanisms and phase transformations is key to developing better battery materials.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Computational Chemistry

Background:

  • Intercalation compounds are vital electrodes in lithium-ion batteries, with properties influenced by host chemistry, crystal structure, and lithium concentration.
  • Lithium concentration variations during battery cycling often trigger phase transformations, impacting material performance.
  • While voltage profiles are understood, the kinetics of lithium diffusion, phase transformations, and interface reactions in these materials remain poorly characterized.

Purpose of the Study:

  • To review key factors governing lithium diffusion in intercalation compounds.
  • To illustrate the correlation between complex diffusion mechanisms and crystal structure.
  • To elucidate the effect of chemistry and crystal structure on kinetic properties using first-principles statistical mechanics.

Main Methods:

  • Review of first-principles statistical mechanical approaches.
  • Analysis of lithium diffusion mechanisms and associated migration barriers.
  • Investigation of vacancy cluster mechanisms and their dependence on lithium concentration.

Main Results:

  • Lithium diffusion coefficients vary significantly (orders of magnitude) with lithium content.
  • Vacancy clusters are a common diffusion mechanism, decreasing mobility in lithium-rich hosts.
  • Crystallographic and electronic factors strongly influence lithium mobility and its dependence on lithium concentration.

Conclusions:

  • Crystal structure complexity dictates lithium diffusion mechanisms and their concentration dependence.
  • Understanding these fundamental diffusion processes is crucial for designing advanced electrode materials.
  • First-principles methods provide essential insights into kinetic properties for battery technology development.