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相关概念视频

Ionic Crystal Structures02:42

Ionic Crystal Structures

14.1K
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...
14.1K
Ionic Strength: Effects on Chemical Equilibria01:19

Ionic Strength: Effects on Chemical Equilibria

1.4K
The addition of an inert ionic compound increases the solubility of a sparingly soluble salt. For example, adding potassium nitrate to a saturated solution of calcium sulfate significantly enhances the solubility of calcium sulfate. Le Châtelier's principle cannot predict this shift in the equilibrium. Instead, this could be explained in terms of changes in the effective concentration of the ions in solution in the presence of added inert salt.
In this solution, the primary...
1.4K
Formation of Complex Ions03:45

Formation of Complex Ions

23.3K
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
23.3K
Intermolecular Forces03:13

Intermolecular Forces

57.7K
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...
57.7K
Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

41.2K
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. 
41.2K
Electrolytes: van't Hoff Factor03:08

Electrolytes: van't Hoff Factor

32.9K
Colligative Properties of Electrolytes
The colligative properties of a solution depend only on the number, not on the identity, of solute species dissolved. The concentration terms in the equations for various colligative properties (freezing point depression, boiling point elevation, osmotic pressure) pertain to all solute species present in the solution. Nonelectrolytes dissolve physically without dissociation or any other accompanying process. Each molecule that dissolves yields one...
32.9K

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相关实验视频

Updated: Jun 5, 2025

Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
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Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks

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同价有机框架通过电解质溶解操纵实现了高效的三维K存储.

Yinshuang Pang1,2, Qingxue Lai1,2, Haobo Xia2

  • 1Zhenjiang Metrological Verification and Testing Center, Zhenjiang 212009, P. R. China.

ACS applied materials & interfaces
|December 13, 2024
PubMed
概括

本研究介绍了CN-COF,一种用于离子电池 (PIB) 的新型共价有机框架 (COF) 阳极. 它通过优化电解质化学实现了性能提升,使得能够稳定高效地储存.

关键词:
协价有机框架 协价有机框架电解质化学 电解质化学K-存储机制的 K-存储机制.纳米结构设计的设计.固体-电解质相间阶段

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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
  • 储能 储能 储能 储能 储能 储能

背景情况:

  • 有机框架 (COF) 显示出作为离子电池 (PIB) 的阳极材料的前景.
  • 现有的COF材料面临诸多挑战,包括容量低,速度不佳,动力缓慢等.
  • 这些局限性阻碍了COF在高效的K储存中得到广泛应用.

研究的目的:

  • 为高效离子电池阳极开发一种新的3D COF材料 (CN-COF).
  • 通过电解质化学兼容性来增强界面稳定性和反应动力学.
  • 研究纳米结构设计和电解质化学对K-存储机制的协同效应.

主要方法:

  • 合成了一个三维 (3D) COF 材料 (CN-COF),含有高含量和类似石墨的层叠.
  • 采用电解质化学兼容性策略,使用优化的高度THF基电解质 (HTE).
  • 具有丰富的无机成分的均和稳定的固体电解质介相 (SEI) 的形成.

主要成果:

  • 该CN-COF材料在50mA/g时提供了385.8mAh/g的高可逆容量.
  • 在500mA/g的1500个循环后保持了95.3mAh/g的容量,显示出出色的循环稳定性.
  • 由于优化的SEI层,实现了快速扩散动力学和增强的界面稳定性.

结论:

  • 开发的CN-COF材料与优化的HTE相结合,显著提高了离子电池阳极性能.
  • 该研究表明,通过结合纳米结构工程和电解质优化,设计先进的K存储材料的可行策略.
  • 这项工作为下一代能源存储解决方案操纵K存储机制提供了洞察力.