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相关概念视频

Molecular and Ionic Solids02:54

Molecular and Ionic Solids

17.0K
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...
17.0K
Ion Exchange01:17

Ion Exchange

565
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
565
Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

41.3K
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. 
41.3K
Ionic Crystal Structures02:42

Ionic Crystal Structures

14.2K
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...
14.2K
Ionic Strength: Overview01:12

Ionic Strength: Overview

1.3K
The ionic strength of a solution is a quantitative way of expressing the total electrolyte concentration of a solution. This concept was first introduced in 1921 by two American physical chemists, Gilbert N. Lewis and Merle Randall, while describing the activity coefficient of strong electrolytes. During the calculation of ionic strength (I or μ), all the cations and anions are considered. However, the concentration (c) of an ion with a greater charge number (z) has a greater contribution...
1.3K
Electrolyte and Nonelectrolyte Solutions02:21

Electrolyte and Nonelectrolyte Solutions

62.5K
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.
62.5K

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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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一个超离子固态块共聚合物超离子电解质.

Daniel T Krause1, Beate Förster2, Martin Dulle3

  • 1Helmholtz Institute Münster, IEK-12, Forschungszentrum Jülich GmbH, Corrensstr. 46, Münster, Germany.

Small (Weinheim an der Bergstrasse, Germany)
|September 16, 2024
PubMed
概括
此摘要是机器生成的。

将二三甲硫化物 (LiTFSI) 添加到聚乙烯氧化物 (PEO) 块共聚合物中,通过超静电度的添加,产生具有高离子导电性的晶体相. 这一突破使得先进的固体聚合物电解质可用于更安全的高能电池.

关键词:
区块共聚物电解质的电解质.区块共聚合物 区块共聚合物聚乙烯氧化物 (PEO) 的使用固态电解质 固态电解质超离子导体是一种超离子导体.

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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
  • 聚合物科学 聚合物科学

背景情况:

  • 聚合物固态电解质由于安全性和稳定性,对高能量密度电池具有前景.
  • 这些材料的低离子导电性阻碍了它们的实际应用.
  • 开发具有高离子导电性的电解质对于下一代电池技术至关重要.

研究的目的:

  • 为了研究超静态度二三甲硫化物 (LiTFSI) 添加对聚乙烯氧化物 (PEO) 阻断共聚合物电解质的影响.
  • 在固体聚合物电解质中实现高离子导电率和低激活能量.
  • 探索基于PEO的电解质中的新型形态和传导途径.

主要方法:

  • 合成和表征具有不同LiTFSI度的PEO块共聚合物.
  • 电化学阻抗光谱测量离子导电性和激活能量.
  • 分析块共聚合物形态和相变的显微镜技术.

主要成果:

  • 超静态度 LiTFSI 添加诱导的晶体 PEO 块共聚合物相.
  • 形成双连续的Fddd和状腺网络形态,促进了3D离子导电路径的形成.
  • 在90°C达到高达1 x 10^-1 S cm^-1的离子导电性,在室温 (4 x 10^-2 S cm^-1) 和低温 (>1 x 10^-3 S cm^-1在-20°C) 中具有适度的导电性.
  • 观察到的低激活能量低至0.19 eV.
  • 用溶剂对PEO和LiTFSI的联合结晶被确定为超离子导电的关键.

结论:

  • 该研究表明,在基于PEO的固体聚合物电解质中实现超离子导电性的新途径.
  • 高度的盐和由此产生的晶体相对于增强的离子运输至关重要.
  • 这些发现为制造具有广泛温度性能的先进固体聚合物电解质为电气设备铺平了道路.