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相关概念视频

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
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 Compounds: Formulas and Nomenclature03:34

Ionic Compounds: Formulas and Nomenclature

66.4K
An element composed of atoms that readily lose electrons (a metal) can react with an element composed of atoms that readily gain electrons (a nonmetal) to produce ions through complete electron transfer. The compound formed by this transfer is stabilized by the electrostatic attractions (ionic bonds) between the oppositely charged ions.
66.4K
Formation of Complex Ions03:45

Formation of Complex Ions

23.2K
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...
23.2K
Electrolyte and Nonelectrolyte Solutions02:21

Electrolyte and Nonelectrolyte Solutions

62.2K
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.
62.2K
Ionic Radii03:10

Ionic Radii

27.5K
Ionic radius is the measure used to describe the size of an ion. A cation always has fewer electrons and the same number of protons as the parent atom; it is smaller than the atom from which it is derived. For example, the covalent radius of an aluminum atom (1s22s22p63s23p1) is 118 pm, whereas the ionic radius of an Al3+ (1s22s22p6) is 68 pm. As electrons are removed from the outer valence shell, the remaining core electrons occupying smaller shells experience a greater effective nuclear...
27.5K

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相关实验视频

Updated: Jun 4, 2025

Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
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用于离子离子电池的基于伊米达的离子液体电解质.

Omar Alshangiti1, Giulia Galatolo1, Camilla Di Mino1

  • 1Department of Materials, University of Oxford, Oxford OX1 3PH, United Kingdom.

ACS energy letters
|December 19, 2024
PubMed
概括

研究人员使用一种新的离子液体开发出了用于离子电池 (FIB) 的稳定液体电解质. 这一突破使高压运行成为可能,克服了离子电池技术的关键挑战.

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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

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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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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
  • 储能 储能 储能 储能 储能 储能

背景情况:

  • 离子电池 (FIB) 在没有关键矿物质的情况下提供高的理论能量密度.
  • 为FIBs开发稳定的液体电解质是具有挑战性的,因为化盐的溶解度和离子反应性较低.

研究的目的:

  • 为高压离子电池制造一种化学稳定且高度溶解的电解质.
  • 为了研究离子在新型电解质中的溶解结构和稳定性.

主要方法:

  • 使用了一种由1,3-dimethylimidazolium bis(trifluoromethanesulfonyl) imide ([MMIm][TFSI]) 和四甲基化物 (TMAF) 组成的新型电解质.
  • 采用NMR光谱和中子总散射来分析化物溶解和相互作用.
  • 测量了电化学稳定窗口 (ESW) 和离子导电性.

主要成果:

  • 实现了4.65V的电化学稳定窗口 (ESW).
  • 获得的离子导电率为9.53 mS cm,化盐溶解度为0.67 m.
  • 核磁共振和中子散射揭示了由静电相互作用主导的化物溶解,表明[MMIm]离子的稳定性.

结论:

  • 开发的电解质表现出优异的化学稳定性和对化物离子的高溶解性.
  • 基于[MMIm][TFSI]的电解质显示了使高压离子电池成为可能的巨大潜力.
  • 这项工作解决了先进的离子电池系统液体电解质开发的关键挑战.