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相关概念视频

Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

41.7K
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. 
41.7K
Ionic Bonds00:42

Ionic Bonds

118.6K
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...
118.6K
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

17.2K
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...
17.2K
Ionic Crystal Structures02:42

Ionic Crystal Structures

14.4K
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...
14.4K
Electrolyte and Nonelectrolyte Solutions02:21

Electrolyte and Nonelectrolyte Solutions

63.3K
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.
63.3K
Formation of Complex Ions03:45

Formation of Complex Ions

23.7K
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...
23.7K

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相关实验视频

Updated: Jul 18, 2025

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
05:33

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

Published on: August 12, 2013

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多元组件共价有机框架 固体电解质 允许有效的离子解离和扩散全固态电池.

Jun-Hyeong Lee1, Hajin Lee2, Jaewoo Lee1

  • 1Department of Materials Science and Chemical Engineering, Hanyang University, Ansan, 15588, Republic of Korea.

ACS nano
|August 25, 2023
PubMed
概括

一种新型的有机固体电解质,二乙烯甘改性共价有机框架 (DEG-PMCOF),通过改善离子传输和稳定性,提高了全固态金属电池 (LMB) 的安全性和性能.

关键词:
全固态金属电池是完全固态的金属电池.和有机固体电解质的电解质.协价有机框架 协价有机框架没有树石的树石.多元元件离子导体多元件离子导体

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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
  • 聚合物化学 聚合物化学

背景情况:

  • 有机固体电解质对于安全,高能全固态金属电池 (LMB) 至关重要.
  • 挑战包括易于离子解离和这些电解质中的有效离子运输.
  • 开发先进的材料是克服当前LMB技术局限性的关键.

研究的目的:

  • 为所有固态LMB开发一种新的多元件固体电解质.
  • 为了增强离子解离和运输特性.
  • 研究新材料的结构和电化学性能.

主要方法:

  • 一种二乙烯糖醇修饰的金共价有机框架 (DEG-PMCOF) 的合成.
  • 离子导电性,离子转移数和电化学稳定性窗口的表征.
  • 利用分子动力学和密度函数理论模拟来获得机械的见解.
  • 使用DEG-PMCOF电解质组装和测试全固态LMB.

主要成果:

  • 在室温下,DEG-PMCOF具有高离子导电性 (1.71 × 10−4 S cm−1) 和0.61的离子转移数.
  • 这种材料有效地抑制了树状石的形成和死.
  • 模拟显示了DEG-PMCOF结构内增强的离子传输机制.
  • 在长期循环过程中,所有固态LMB都表现出高特异性容量保留 (99%) 和库伦比效率 (99%).

结论:

  • DEG-PMCOF方法为设计先进的固态电解质提供了一个有效的策略.
  • 这种材料显著提高了全固态LMB的安全性和长期循环性能.
  • 这些发现为下一代电池技术提供了有希望的途径.