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相关概念视频

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...
14.7K
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...
17.6K
Electrolyte and Nonelectrolyte Solutions02:21

Electrolyte and Nonelectrolyte Solutions

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Substances that undergo either a physical or a chemical change in solution to yield ions that can conduct electricity are called electrolytes. If a substance yields ions in solution, that is, if the compound undergoes 100% dissociation, then the substance is a strong electrolyte. Complete dissociation is indicated by a single forward arrow. For example, water-soluble ionic compounds like sodium chloride dissociate into sodium cations and chloride anions in aqueous solution.
63.9K
Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

42.3K
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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Batteries and Fuel Cells03:12

Batteries and Fuel Cells

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A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
28.0K
Electrolysis03:00

Electrolysis

27.3K
In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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新的氧化固体电解质具有增强的导电性,用于全固态电池.

Wei Xue1, Yanming Cui2, Zhixu Long1

  • 1College of Aerospace Engineering, Chongqing University, Chongqing 400044, China.

The journal of physical chemistry letters
|August 6, 2025
PubMed
概括

研究人员开发了一种新的Li-M-X5氧化固体电解质 (SE),它超越了传统的Li-M-X6框架. 这种新型材料具有创纪录的离子导电性,并使全固态电池 (ASSB) 能够稳定循环运行.

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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
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科学领域:

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

背景情况:

  • 传统的Li-M-X6框架在固体电解质 (SE) 中面临导电性限制.
  • 基于化物的SE对于固态电池 (ASSB) 开发至关重要,但通常患有较差的离子导电性.
  • 克服导电性限制是推进高性能ASSB的关键.

研究的目的:

  • 开发一种新的Li-M-X5氧化化学物质,以克服基于化的SE的导电性限制.
  • 为了研究新氧化物材料的结构和离子传输特性.
  • 评估开发的SE在全固态电池 (ASSB) 中的性能.

主要方法:

  • 合成 Li-M-X5 氧化物化合物 (Li3xTaO3xCl5-3x).
  • 使用X射线衍射 (XRD),拉曼光谱,X射线光电子光谱 (XPS) 和X射线吸收光谱 (XAS) 进行全面的表征.
  • 在各种温度下进行离子导电性测量和在完整的ASSB中进行电化学性能测试.

主要成果:

  • 在30°C时达到创纪录的离子导电率9mS cm-1和在-35°C时达到0.59mS cm-1,超过了大多数报告的化物.
  • 证实氧气结合会诱导结构扭曲并增强离子迁移通路.
  • 在完整的ASSB中表现出良好的稳定循环,在4C率下3200个循环后保持100%的容量.

结论:

  • 新的Li-M-X5氧化化学提供了一个有前途的替代传统SEs.
  • 氧气的结合是一种有效的策略,可以提高化基SE的离子导电性.
  • 开发的材料使ASSB的高性能和稳定运行成为可能.