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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...
14.5K
Ion Exchange01:17

Ion Exchange

624
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...
624
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

17.3K
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...
17.3K
Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

41.8K
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. 
41.8K
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
Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

638
Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
638

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相关实验视频

Updated: Jul 23, 2025

Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
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Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature

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结构灵活的基于和的离子液体电解质.

Sourav Bhowmick1, Gaurav Tatrari1, Andrei Filippov1

  • 1Chemistry of Interfaces, Lulea University of Technology, SE-971 87 Lulea, Sweden. faiz.ullah@ltu.se.

Physical chemistry chemical physics : PCCP
|July 14, 2023
PubMed
概括
此摘要是机器生成的。

基于pyrrolidinium的离子液体由于它们的快速离子传输和良好的电化学特性,显示出作为高温超级电容电解质的前景,优于基于morpholinium的对应物.

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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

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科学领域:

  • 电化学 电化学 电化学
  • 材料科学 材料科学 材料科学

背景情况:

  • 离子液体 (ILs) 是在环境温度下是液态的盐,为电化学应用提供独特的特性.
  • 结构灵活的酸,如 (Pyrr) 和 (Morph) 可以影响IL的特性.
  • 在IL电解质中的酸离子被探索其潜力.

研究的目的:

  • 研究基于Pyrr和Morph的ILs的物理化学和电化学特性,其中含有酸阳离子.
  • 评估这些ILs作为高温超级电容器中的电解质的性能.

主要方法:

  • 基于Pyrr和Morph的离子液体的合成和表征.
  • 测量离子传输特性,热稳定性,玻璃过渡温度和电化学稳定性窗口.
  • 在高温下对称石墨超级电容器的电化学测试.

主要成果:

  • 所有的IL都表现出高热稳定性,低玻璃过渡温度和宽的电化学稳定性窗口.
  • 与基于Morph的IL相比,基于Pyrr的IL显示出更快的阴离子和离子扩散.
  • 基于Pyrr的ILs在1mVs-1时达到164Fg-1的特定电容,功率密度为609W kg-1和能量密度为27Wh kg-1在90°C.

结论:

  • 基于pyrrolidinium的离子液体与酸离子是高温超级电容器的有希望的电解质.
  • 阴离子的结构灵活性显著影响离子流动性和超级电容器性能.
  • 这些IL为需要高工作温度的先进储能应用提供了可行的替代方案.