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相关概念视频

Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

42.5K
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. 
42.5K
Ionic Bonds00:42

Ionic Bonds

122.2K
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.
Opposing Charges Hold Ions Together in Ionic Compounds
Ionic bonds are reversible electrostatic interactions between ions...
122.2K
Bond Polarity, Dipole Moment, and Percent Ionic Character02:48

Bond Polarity, Dipole Moment, and Percent Ionic Character

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Bond Polarity
30.3K
Ionic Crystal Structures02:42

Ionic Crystal Structures

15.0K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
15.0K
Valence Bond Theory02:45

Valence Bond Theory

34.4K
Overview of Valence Bond Theory
34.4K
Alkyl Halides02:45

Alkyl Halides

17.5K
Structural Properties
Alkyl halides are halogen-substituted alkanes wherein one or more hydrogen atoms of an alkane is replaced by a halogen atom such as fluorine, chlorine, bromine, or iodine. The carbon atom in an alkyl halide is bonded to the halogen atom, which is sp3-hybridized and exhibits a tetrahedral shape.
Unlike alkyl halides, compounds in which a halogen atom is bonded to an sp2 -hybridized carbon atom of a carbon-carbon double bond (C=C) are called vinyl halides. Whereas aryl...
17.5K

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Updated: Sep 20, 2025

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding

Published on: March 24, 2018

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在超化物固态电解质中的化学键共价性.

Jiamin Fu1,2, Han Su1, Jing Luo1

  • 1Department of Mechanical and Materials Engineering, University of Western Ontario, London, Ontario, N6A 5B9, Canada.

Angewandte Chemie (International ed. in English)
|May 29, 2025
PubMed
概括
此摘要是机器生成的。

在化物固态电解质中的超离子过渡是由化学键的变化驱动的,而不是晶体结构的变化. 这种离子-共价过渡是可调节的,对于开发先进的固态电池至关重要.

关键词:
相对应的共价性化物导体是一种化物导体.离子扩散是一种离子扩散.固态电解质 固态电解质

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科学领域:

  • 材料科学 材料科学 材料科学
  • 固态化学 固态化学
  • 电化学 电化学 电化学

背景情况:

  • 化物固态电解质 (SSEs) 显示出所有固态离子电池的潜力,这是由于其高离子导电性和稳定性.
  • 现有的SSE研究主要集中在离子堆叠结构上,忽视了化学键对离子传输的影响.

研究的目的:

  • 为了调查债券动态在化物SSEs的超离子转换 (SIT) 中的作用.
  • 探索Li3InBr6和相关化合物中化学结合和离子运输机制之间的关系.

主要方法:

  • 使用同步射线X射线技术研究了债券动态.
  • 最初的分子动力学 (AIMD) 模拟用于分析离子扩散和集体离子运动.
  • 这项研究扩展到Li3LnBr6系列 (Ln = Gd, Tb, Ho, Tm, Lu).

主要成果:

  • 在化物SSEs中,超离子过渡 (SIT) 是由热诱导的从离子到共价键的转变驱动的,独立于晶体相变化.
  • AIMD模拟显示,在更高的温度下,Li+扩散和集体离子运动增加.
  • 在研究的Li3LnBr6系列中,Li3GdBr6显示出最高的离子导电性 (5.2 mS cm-1 在298 K) .
  • 发现离子-共价过渡可以通过电解质修改进行调整,包括阴离子/离子替代和合成方法.

结论:

  • 这项研究为化物SSEs中的离子运输提供了新的理解,强调了化学键特性的关键作用.
  • 这些发现表明,操纵键动态为设计高级电池高性能固态电解质提供了一个有希望的途径.