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相关概念视频

Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

23.9K
An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
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Ionic Crystal Structures02:42

Ionic Crystal Structures

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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...
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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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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

1.3K
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.
An electron moves through the crystal, containing positive ions,...
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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实现超离子导电的无形氧化物

Shumin Zhang1, Feipeng Zhao1, Lo-Yueh Chang2

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

Journal of the American Chemical Society
|January 29, 2024
PubMed
概括
此摘要是机器生成的。

化物固体电解质 (SE) 中的无形成分对于全固态电池 (ASSB) 的快速离子导电至关重要. 将氧气纳入基于的化物 SE 产生无形结构,增强离子导电性和电池性能.

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科学领域:

  • 材料科学
  • 电化学
  • 固态化学

背景情况:

  • 基于化物的固体电解质 (SE) 由于其离子导电性和电化学稳定性,对全固体电池 (ASSB) 是有前途的.
  • 在化物SE中,特别是离子导电中,无形元件的作用仍未得到充分研究.

研究的目的:

  • 研究机械化学制备的化物SE中常见的无形成分的存在和影响.
  • 阐明局部化学在无形阶段和快速离子迁移之间的关系.
  • 探索氧气结合对基于Zr的化物SE的无形化和性能的影响.

主要方法:

  • 化的机械化学制备
  • 用于结构分析的X射线吸收光谱 (XAS).
  • 配对分布函数 (PDF) 的分析
  • 反向蒙特卡洛 (RMC) 建模.
  • 离子导电性测量

主要成果:

  • 无形成分在机械化学合成的化物中普遍存在,并且与快速的离子运输有关.
  • 将氧气纳入基于Zr的化物SE (例如,Li3ZrCl4O1.5) 诱导无形化,形成角共享Zr-O/Cl多面体.
  • 这种独特的无形结构显著降低了离子运输能量障碍,在25°C时达到1.35±0.07×10-3 S cm-1的离子导电率.
  • 通过氧气结合的无形化也提高了机械变形性和电化学性能.

结论:

  • 无形相的存在和特定的局部化学作用对于优化离子导电在化中至关重要.
  • 氧的结合为设计具有增强离子导电性,机械性质和电化学性能的无形化物SE提供了可行的策略.
  • 这项研究为高性能ASSB的先进化物SE的合理设计提供了基本见解.