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Related Concept Videos

The Electrical Double Layer01:30

The Electrical Double Layer

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In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
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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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Metallic Solids02:37

Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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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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The interionic forces of the strong electrolytes depend on the solvent's dielectric constant, which is the ability of a solvent to store electrical energy, based on its polarizability. and the solution's concentration. In high-dielectric solvents and in dilute solutions, weak electrostatic forces keep ions apart. However, in low-dielectric solvents or concentrated solutions, stronger interionic forces may cause ions to pair up as ionic doublets despite being fully ionized. The theory of strong...
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Bonding in Metals02:32

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Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”. 
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Structural Properties of Solid Electrolyte Interphase on Lithium Metal.

Soon-Ki Jeong, Hye-Kang Choi, Yang Soo Kim

    Journal of Nanoscience and Nanotechnology
    |January 5, 2016
    PubMed
    Summary

    Higher LiClO4 concentrations create a thinner, more effective solid electrolyte interphase (SEI) layer on lithium anodes, improving battery cyclability. This layered SEI film, composed of inorganic and organic components, supports a modified compact-stratified layer model.

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    Area of Science:

    • Electrochemistry
    • Materials Science
    • Battery Technology

    Background:

    • The solid electrolyte interphase (SEI) is crucial for lithium battery performance.
    • Understanding SEI structure is key to improving electrode cyclability.

    Purpose of the Study:

    • To investigate the structural properties of SEI formed on lithium anodes in propylene carbonate with varying LiClO4 concentrations.
    • To correlate SEI structure with electrode cyclability and propose a refined structural model.

    Main Methods:

    • Electrochemical cycling of lithium anodes in LiClO4/propylene carbonate solutions.
    • Transmission electron microscopy (TEM) for SEI structural analysis.
    • Chemical treatment with chloroform to identify SEI components.

    Main Results:

    • Higher LiClO4 concentration (3.27 mol kg(-1)) significantly improved electrode cyclability compared to lower concentration (1.09 mol kg(-1)).
    • TEM revealed a thinner SEI layer (approx. 34 nm) with lower resistance in the higher concentration solution versus the lower concentration solution (approx. 120 nm).
    • SEI analysis indicated a two-layer structure: an inner inorganic layer and an outer organic layer.

    Conclusions:

    • The SEI structure is concentration-dependent, with higher LiClO4 leading to a more favorable SEI.
    • The findings support and refine the compact-stratified layer (CSL) model for SEI.
    • A modified CSL model is proposed based on the observed two-layer inorganic-organic SEI structure.