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相关概念视频

Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

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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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Molecular Shape and Polarity03:37

Molecular Shape and Polarity

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Dipole Moment of a Molecule
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Intermolecular Forces03:13

Intermolecular Forces

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Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
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sp3d and sp3d 2 Hybridization
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Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene01:13

Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene

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Bromination and chlorination of aromatic rings by electrophilic aromatic substitution reactions are easily achieved, but fluorination and iodination are difficult to achieve. Fluorine is so reactive that its reaction with benzene is difficult to control, resulting in poor yields of monofluoroaromatic products. To address this, Selectfluor reagent is used as a fluorine source in which a fluorine atom is bonded to a positively charged nitrogen.
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Bond Polarity, Dipole Moment, and Percent Ionic Character

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Bond Polarity
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强大的电池介面由稀化酸盐制成.

Chulgi Nathan Hong1, Mengwen Yan2, Oleg Borodin3

  • 1Electrochemical Energy Systems Laboratory, Department of Mechanical and Process Engineering, ETH Zurich Zürich 8092 Switzerland mlukatskaya@ethz.ch.

Energy & environmental science
|June 20, 2024
PubMed
概括
此摘要是机器生成的。

研究人员开发了一个新的电池策略,使用最小的化添加剂来创建一个强大的固体电解质介相 (SEI). 这提高了电池的性能,并减少了高能电池对环境的影响.

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科学领域:

  • 电化学 电化学 电化学
  • 材料科学 材料科学 材料科学
  • 储能 储能 储能 储能 储能 储能

背景情况:

  • 控制固体电解质间相 (SEI) 对于有效的电池循环和寿命至关重要.
  • 高能电池通常依赖于电解质中的化物种,增加成本和环境问题.

研究的目的:

  • 开发一种具有成本效益和环保的方法,用于电池中强大的SEI形成.
  • 为了实现高能量的稳定循环,金属全细胞使用最小的添加分数.

主要方法:

  • 在电解质中使用非常低度 (∼0.1重量%) 的容易降解的化酸盐.
  • 使用静电吸引力将这些离子集中在阳极表面以形成SEI.

主要成果:

  • 在阳极上形成一个强大的富含的SEI层.
  • 实现了密集的无树脂沉积和高压阴极的金属全电池的稳定循环.

结论:

  • 拟议的方法提供了一种总体策略,通过静电吸引将化学物种定向地传送到电池阳极.
  • 这种方法显著减少了对高分量的化添加剂的依赖,降低了环境足迹和成本.