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Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
Valence Bond Theory02:42

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
Fermi Level Dynamics01:12

Fermi Level Dynamics

The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...
Theory of Strong Electrolytes01:23

Theory of Strong Electrolytes

The interionic forces of the strong electrolytes depend on the solvent's dielectric constant, which is the ability of a solvent to store electrical energy, based on its polarizability. and the solution's concentration. In high-dielectric solvents and in dilute solutions, weak electrostatic forces keep ions apart. However, in low-dielectric solvents or concentrated solutions, stronger interionic forces may cause ions to pair up as ionic doublets despite being fully ionized. The theory of strong...
The Electrical Double Layer01:30

The Electrical Double Layer

In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...

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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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在晶体PEO6:Li(AsF6) 1-x(SbF6) x 中的离子导电性

Scott J Lilley1, Yuri G Andreev, Peter G Bruce

  • 1School of Chemistry, University of St. Andrews, St. Andrews, Fife KY16 9ST, Scotland.

Journal of the American Chemical Society
|September 14, 2006
PubMed
概括
此摘要是机器生成的。

聚乙烯氧化物 (PEO) 与六甲 (LiAsF6) 和六抗 (LiSbF6) 的固体溶液显著提高了离子导电性. 这种增强对于开发先进的固体聚合物电解质至关重要.

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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:

  • 聚乙烯氧化物 (PEO) 是一种广泛研究的聚合物电解质.
  • 固体聚合物电解质中的离子导电对于电池技术至关重要.
  • 调整LiAsF6和LiSbF6等盐的特性对于提高性能至关重要.

研究的目的:

  • 研究PEO6:LiAsF6和PEO6:LiSbF6形成固体溶液对离子导电性的影响.
  • 为了确定混合盐系统是否可以达到比单个盐系统更高的离子导电性.
  • 探索PEO6:Li(AsF6)1-x(SbF6)x作为先进固体聚合物电解质的潜力.

主要方法:

  • 合成PEO6:Li(AsF6) 1-x(SbF6) x. 的固体溶液.
  • 使用电化学技术测量离子导电能力.
  • 分析固体溶液的结构和电化学特性.

主要成果:

  • PEO6:LiXF6 (X = As,Sb) 复合体的离子导电率增加了超过一个数量级.
  • 固体溶液的形成显著增强了离子运输特性.
  • 与二进制系统相比,PEO6:Li ((AsF6) 1-x ((SbF6) x具有更高的离子导电性.

结论:

  • PEO6:Li(AsF6) 1-x(SbF6) x的固体溶液有效地提高了离子导电性.
  • 这种方法为开发高性能固体聚合物电解质提供了一个有前途的战略.
  • 这些发现有助于推进固态电池技术的发展.