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Related Concept Videos

Carrier Transport01:21

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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:
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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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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.
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Ionic Bonds00:42

Ionic Bonds

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Overview
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
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Drift Velocity01:19

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5.7K
The high speed of electrical signals results from the fact that the force between charges acts rapidly at a distance. Thus, when a free charge is forced into a wire, the incoming charge pushes other charges ahead due to the repulsive force between like charges. These moving charges move the charges farther down the line. The density of charge in a system cannot easily be increased, so the signal is passed on rapidly. The resulting electrical shock wave moves through the system at nearly the...
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Ions and Ionic Charges03:27

Ions and Ionic Charges

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In ordinary chemical reactions, the nucleus — which contains the protons and neutrons of each atom and thus identifies the element — remains unchanged. Electrons, however, can be added to atoms by transfer from other atoms, lost by transfer to other atoms, or shared with other atoms. The transfer and sharing of electrons among atoms govern the chemistry of the elements. During the formation of some compounds, atoms gain or lose electrons to form electrically charged particles called...
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Charge Transport in Electronic-Ionic Composites.

Long Zhang1, Xiaowen Zhan1, Y T Cheng1

  • 1Department of Chemical and Materials Engineering, University of Kentucky , Lexington, Kentucky 40506, United States.

The Journal of Physical Chemistry Letters
|October 11, 2017
PubMed
Summary
This summary is machine-generated.

Composite electrodes improve ion accessibility in high-energy all-solid-state lithium batteries. This study explores the microstructure-conductivity link, focusing on lithium ion conductivity in these advanced battery materials.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-State Batteries

Background:

  • All-solid-state lithium batteries offer enhanced safety and energy density.
  • Limited ion accessibility in composite cathodes hinders battery performance.
  • Understanding ion transport in multiphase systems is crucial for advancement.

Purpose of the Study:

  • To investigate the relationship between microstructure and ionic conductivity in composite electrodes.
  • To focus on enhancing lithium ion conductivity within these composite structures.
  • To lay the groundwork for understanding electrochemical reactions in solid multiphase battery systems.

Main Methods:

  • Fabrication of composite electrodes with cathode particles and an ion-conducting phase.
  • Microstructural characterization of the composite materials.
  • Electrochemical impedance spectroscopy to measure lithium ion conductivity.

Main Results:

  • Demonstrated a correlation between composite electrode microstructure and lithium ion conductivity.
  • Identified key microstructural features influencing ion transport.
  • Established a baseline for further research into multiphase electrochemical behavior.

Conclusions:

  • Composite electrodes are a viable strategy to improve ion accessibility in solid-state batteries.
  • Microstructure engineering is critical for optimizing ionic conductivity.
  • This work provides foundational insights for developing next-generation all-solid-state lithium batteries.