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Ionic Crystal Structures02:42

Ionic Crystal Structures

15.0K
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...
15.0K
Intermolecular Forces03:13

Intermolecular Forces

61.4K
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...
61.4K
Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

42.5K
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. 
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Molecular Shape and Polarity03:37

Molecular Shape and Polarity

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Dipole Moment of a Molecule
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Ionic Compounds: Formulas and Nomenclature03:34

Ionic Compounds: Formulas and Nomenclature

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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.
73.9K
Alkyl Halides02:45

Alkyl Halides

17.5K
Structural Properties
Alkyl halides are halogen-substituted alkanes wherein one or more hydrogen atoms of an alkane is replaced by a halogen atom such as fluorine, chlorine, bromine, or iodine. The carbon atom in an alkyl halide is bonded to the halogen atom, which is sp3-hybridized and exhibits a tetrahedral shape.
Unlike alkyl halides, compounds in which a halogen atom is bonded to an sp2 -hybridized carbon atom of a carbon-carbon double bond (C=C) are called vinyl halides. Whereas aryl...
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含有二酸阳离子的二离子离子液体.

Kentaro Kamada1, Kohei Nishimoto1, Toshiki Nokami2

  • 1Graduate School of Energy Science, Kyoto University, Yoshida-honmachi, Sakyo-ku, Kyoto 606-8501, Japan. matsumoto.kazuhiko.4c@kyoto-u.ac.jp.

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概括

滴定离子液体由于可调节的结构,显示出充满希望的电池电解质. 在这项研究中,一种以太结合的二离子液体表现出优异的离子导电性和电化学稳定性.

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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
  • 化学工程是化学工程的重要组成部分.

背景情况:

  • 分离离子离子液 (DILs) 与传统离子液相比,具有潜在的优势,包括增强的热稳定性和更宽的电化学潜在窗口.
  • 这些特性使得DIL成为先进的电解质应用的有吸引力的候选者,特别是在二次电池中.
  • 然而,由于研究有限,对DIL中的结构-财产关系缺乏全面的理解.

研究的目的:

  • 使用PO2F2-阳离子合成和表征一系列二离子液体.
  • 研究不同阴离子,阴离子和连接器结构对这些DILs物理和电化学性能的影响.
  • 根据其性能,确定对二次电池应用的有希望的DIL候选人.

主要方法:

  • 新型二离子液体的合成与,和伊米达酸.
  • 将PO2F2-离子纳入并与BF4-离子进行比较.
  • 使用分析和计算技术评估物理性质 (例如,离子导电性) 和电化学性质 (例如,电化学窗口).

主要成果:

  • 这项研究成功合成并分析了一系列二离子液体.
  • 系统地评估了不同阴离子核 (,,伊米达) 和离子 (PO2F2-,BF4-) 对 DIL 特性的影响.
  • 含有以太链接器的二离子液体表现出特别高的离子导电性和广泛的电化学窗口.

结论:

  • 滴定离子液体的结构显著影响其物理和电化学性能.
  • 带有以太链接器的二离子液体代表了下一代电池电解质的非常有前途的材料类.
  • 对二离子液体的进一步研究可以释放它们在储能应用中的全部潜力.