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相关概念视频

Ionic Bonds00:42

Ionic Bonds

118.2K
Overview
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
Ionic bonds are reversible electrostatic interactions between ions...
118.2K
Electrolytes: van't Hoff Factor03:08

Electrolytes: van't Hoff Factor

33.0K
Colligative Properties of Electrolytes
The colligative properties of a solution depend only on the number, not on the identity, of solute species dissolved. The concentration terms in the equations for various colligative properties (freezing point depression, boiling point elevation, osmotic pressure) pertain to all solute species present in the solution. Nonelectrolytes dissolve physically without dissociation or any other accompanying process. Each molecule that dissolves yields one...
33.0K
Ionic Strength: Effects on Chemical Equilibria01:19

Ionic Strength: Effects on Chemical Equilibria

1.4K
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...
1.4K
Aqueous Solutions and Heats of Hydration02:42

Aqueous Solutions and Heats of Hydration

14.6K
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...
14.6K
Electrolyte and Nonelectrolyte Solutions02:21

Electrolyte and Nonelectrolyte Solutions

62.7K
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.
62.7K
Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

41.4K
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. 
41.4K

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相关实验视频

Updated: Jun 21, 2025

Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
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分子对接电解质使高压电池的化学成分成为可能.

Baochen Ma1, Haikuo Zhang1, Ruhong Li1

  • 1State Key Laboratory of Silicon and Advanced Semiconductor Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, China.

Nature chemistry
|July 15, 2024
PubMed
概括

研究人员为可充电电池开发了一种新的电解质设计. 这一策略提高了离子反应速度和稳定性,提高了电池的性能和寿命.

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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:

  • 传统的电池电解质由于高溶解能量和电极不良兼容性而遭受缓慢的反应动力学和降解.
  • 在非协调溶剂中盐解离的局限性阻碍了快速稳定的化学的发展.
  • 在抑制副作用的同时实现高效的法拉代克反应对于理想的可充电电池电解质至关重要.

研究的目的:

  • 提出一种新的电解质设计策略,克服非协调溶剂中盐解离的局限性.
  • 通过增强离子反应动力学,实现快速稳定的化学.
  • 开发用于高压电池的先进电解质,使用分子对接溶解机制.

主要方法:

  • 通过键相互作用 (Fδ-Hδ+或Hδ+Oδ-) 激活非协调溶剂,通过与化或化化合物混合.
  • 实施分子对接溶解策略,以创建动态的+溶剂协调.
  • 根据拟议的设计,合成和测试了25种新的电解质配方.

主要成果:

  • 在开发的电解质中证明了高涂/剥离库伦比克效率.
  • 在全细胞和囊细胞中实现了有前途的容量保留,这表明稳定性得到了增强.
  • 分子对接方法成功促进了快速的Li+反应动力学,并抑制了不必要的电极副作用反应.

结论:

  • 分子对接电解质设计策略有效地提高了非协调溶剂中的Li+动力学和稳定性.
  • 这种方法为开发用于高压电池的先进电解质提供了途径.
  • 这项研究验证了分子对接的溶解机制,用于设计下一代储能解决方案.