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相关概念视频

Solvating Effects02:12

Solvating Effects

7.3K
An understanding of the solvating effect helps rationalize the relation between solvation and acidity of the compound. In addition, this also explains the relative stability of conjugate bases for compounds with different pKa values. This lesson details, in-depth, the principle of solvating effects. The strength of an acid and the stability of its corresponding conjugate base are determined using pKa values. This observed relationship is a consequence of solvation, which is the interaction...
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Phosphate Buffer01:22

Phosphate Buffer

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The phosphate buffer system is a critical biological mechanism for maintaining pH stability in the body. This system operates primarily through two components: sodium dihydrogen phosphate (NaH2PO4), which acts as a weak acid, and sodium hydrogen phosphate (Na2HPO4), which serves as a weak base.
Sodium dihydrogen phosphate does not fully dissociate in neutral or acidic solutions. When a strong base, such as sodium hydroxide (NaOH), is introduced into the solution, sodium dihydrogen phosphate...
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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
Aqueous Solutions and Heats of Hydration02:42

Aqueous Solutions and Heats of Hydration

14.3K
Water and other polar molecules are attracted to ions. The electrostatic attraction between an ion and a molecule with a dipole is called an ion-dipole attraction. These attractions play an important role in the dissolution of ionic compounds in water.
When ionic compounds dissolve in water, the ions in the solid separate and disperse uniformly throughout the solution because water molecules surround and solvate the ions, reducing the strong electrostatic forces between them. This process...
14.3K
Ionic Strength: Effects on Chemical Equilibria01:19

Ionic Strength: Effects on Chemical Equilibria

1.3K
The addition of an inert ionic compound increases the solubility of a sparingly soluble salt. For example, adding potassium nitrate to a saturated solution of calcium sulfate significantly enhances the solubility of calcium sulfate. Le Châtelier's principle cannot predict this shift in the equilibrium. Instead, this could be explained in terms of changes in the effective concentration of the ions in solution in the presence of added inert salt.
In this solution, the primary...
1.3K
Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

328
In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
328

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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

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构建准局部化的高度溶解结构,以稳定电池接口在非易燃的酸盐基电解质中.

Chenyang Shi1, Mengran Wang1,2,3,4, Zari Tehrani5

  • 1School of Metallurgy and Environment, Central South University, Changsha, Hunan, 410083, China.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|December 16, 2024
PubMed
概括
此摘要是机器生成的。

将极性碳酸盐溶剂引入离子电池中,可以防止阻燃型三二二乙烯酸盐 (TFEP) 降解石墨阳极. 这一策略提高了电池的安全性和循环性能.

关键词:
电池安全 电池安全阻燃电解质是一种阻燃电解质.化酸盐 化酸盐的含量是多少分子设计分子设计.溶解调节调节调节调节

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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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Elemental-sensitive Detection of the Chemistry in Batteries through Soft X-ray Absorption Spectroscopy and Resonant Inelastic X-ray Scattering
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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:

  • 基于酸盐的电解质提高了离子电池的安全性,但面临与石墨阳极和高压阴极的兼容性问题.
  • 通常使用的化酸盐会增加界面电阻,导致性能降低.

研究的目的:

  • 开发一种阻燃电解质,对石墨阳极和高压阴极具有更好的兼容性.
  • 为了提高离子电池的循环稳定性和整体性能,使用基于酸盐的电解质.

主要方法:

  • 加入极性碳酸盐溶剂来修改离子的溶解结构.
  • 形成一个准局部化的高度溶解结构,以限制电解质的减少.
  • 对LiNi0.8Mn0.1Co0.1O2 (NCM811) 的电化学测试. 带有优化电解质的石墨 (Gr) 囊细胞.

主要成果:

  • 优化的电解质阻止了trifluorethyl phosphate (TFEP) 参与离子溶解外,限制了其减少.
  • 使用优化电解质的Gr囊细胞在0.5C的370个循环后显示了80.1%的容量保留,明显优于对照 (47.1%在300个循环后).
  • 在4.5V切断电压下运行的电池在125个循环后保持了82.8%的容量,超过了商业碳酸盐电解质 (125个循环后56.9%).

结论:

  • 开发的准局部高度溶解结构有效地稳定了电极接口.
  • 这一策略显著提高了基于酸盐的阻燃电解质的循环性能,使离子电池更安全,更耐用.