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Related Concept Videos

Band Theory02:35

Band Theory

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When two or more atoms come together to form a molecule, their atomic orbitals combine and molecular orbitals of distinct energies result. In a solid, there are a large number of atoms, and therefore a large number of atomic orbitals that may be combined into molecular orbitals. These groups of molecular orbitals are so closely placed together to form continuous regions of energies, known as the bands.
The energy difference between these bands is known as the band gap.
Conductor, Semiconductor,...
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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.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
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Semiconductors01:22

Semiconductors

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There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
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Theory of Metallic Conduction01:17

Theory of Metallic Conduction

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The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
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Carrier Transport01:21

Carrier Transport

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The generation of electrical current in semiconductors is fundamentally driven by two mechanisms: drift and diffusion. These processes are essential for the functionality and performance of semiconductor-based devices.
Drift Current:
The drift of charge carriers is started by an external electric field (E). Charged particles, such as electrons and holes, experience an acceleration between collisions with lattice atoms. For electrons, this results in a drift velocity (vd) given by:
414
Types of Semiconductors01:20

Types of Semiconductors

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Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
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Comprehensive Characterization of Extended Defects in Semiconductor Materials by a Scanning Electron Microscope
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Heterogeneity in Point Defect Distribution and Mobility in Solid Ion Conductors.

Md Salman Rabbi Limon1, Zeeshan Ahmad1

  • 1Department of Mechanical Engineering, Texas Tech University, Lubbock, Texas 79409, United States.

ACS Applied Materials & Interfaces
|September 12, 2024
PubMed
Summary

Understanding point defects in solid ion conductors is key for fast-charging batteries. This study reveals significant differences in defect formation energy between bulk and surface regions, impacting defect density and ion transport. Surface engineering is crucial for optimizing battery performance.

Keywords:
defect migrationlithium-ion batteriespoint defectssolid ion conductorsspace chargesurfaces and interfaces

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Computational Materials Science

Background:

  • Solid ion conductors are crucial for high-energy-density and safe batteries, particularly alkali metal anodes.
  • Efficient ion transport in these conductors, essential for fast charging, depends on understanding point defect behavior.
  • Heterogeneity in defect distribution, especially near surfaces and interfaces, can significantly influence device performance.

Purpose of the Study:

  • To investigate the heterogeneity of defect distribution in Li3OCl and LiPON solid ion conductors.
  • To quantify the defect formation energy (DFE) as a function of distance from surfaces and interfaces.
  • To develop a revised model for defect behavior considering surface effects and grain sizes.

Main Methods:

  • First-principles simulations were employed to calculate the defect formation energy (DFE) in Li3OCl and LiPON.
  • Calculations focused on Li+ vacancy in Li3OCl at the interface with lithium metal.
  • Migration barriers for defect movement between bulk and surface regions were computed.

Main Results:

  • Significant differences in DFE were observed between bulk and surface/interface regions, leading to defect aggregation/depletion.
  • Li3OCl showed lower surface DFE, while LiPON exhibited higher surface DFE compared to their bulk values.
  • Defect density can be up to 14 orders of magnitude higher at surfaces than in the bulk, with DFE transition characterized by an exponential function.
  • Surface effects dominate for grain sizes below 1 μm.
  • Lithium vacancies have lower migration barriers towards the surface, while interstitial defects show comparable kinetics.

Conclusions:

  • The heterogeneity of defect formation energy at surfaces and interfaces significantly impacts ion transport in solid ion conductors.
  • A revised model incorporating exponential DFE trends accurately describes defect behavior and the influence of grain size.
  • Both thermodynamic (DFE) and kinetic (migration barriers) factors are critical for designing efficient solid ion conductors, emphasizing surface defect engineering.