通过键在离子液中削弱库伦相互作用使得超高速超级电容器成为可能
Ya-Feng Fan1, Zong-Lin Yi1, Yi Zhou1
1Shanxi Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001 China.
Journal of colloid and interface science
|January 21, 2025
概括
研究人员通过将键引入离子液体电解质来增强超快超级电容器. 这削弱了离子相互作用,提高了性能,并使能更快地储存能量.
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
背景情况:
- 离子液体电解质为超快超级电容器提供广泛的电化学窗口和稳定性.
- 这些电解质中的强离子相互作用会导致过度选,并减缓电双层 (EDL) 的形成,阻碍速率性能.
研究的目的:
- 为了减轻离子液体电解质中的强库伦相互作用,以提高超级电容器速率性能.
- 为了研究键在调节电极接口上的离子行为中的作用.
主要方法:
- 密度函数理论 (DFT) 的计算.
- 核磁共振 (NMR) 光谱和富里埃红外光谱 (FTIR).
- 不同电容测量. 不同电容测量.
主要成果:
- 引入键有效抑制了离子之间的库伦相互作用.
- 结合改善了离子协调和电极接口动态,增强了离子反应动力学.
- 制造的超级电容器表现出高容量 (100.0mFg-1在120Hz) 和快速放松时间 (0.62ms).
结论:
- 竞争性键相互作用是削弱电解质中的离子库伦比力的一种可行的策略.
- 这种方法显著提高了超高速超级电容器的速度能力和整体性能.
- 该研究为设计用于高性能能量存储设备的先进电解质提供了一条新的途径.
更多相关视频
12:00Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System
Published on: January 7, 2022
12.0K
11:04Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
Published on: December 20, 2016
12.9K
相关概念视频
Intermolecular Forces
57.5K
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...
57.5K
Hydrogen Bonds
120.6K
Hydrogen bonds are weak attractions between atoms that have formed other chemical bonds. One of these atoms is electronegative, like oxygen, and has a partial negative charge. The other is a hydrogen atom that has bonded with another electronegative atom and has a partial positive charge.
Hydrogen Bonds Control the World!
Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are unequally shared....
Hydrogen Bonds Control the World!
Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are unequally shared....
120.6K
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...
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
Van der Waals Interactions
63.4K
Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.
63.4K
Intermolecular vs Intramolecular Forces
86.4K
Intermolecular forces (IMF) are electrostatic attractions arising from charge-charge interactions between molecules. The strength of the intermolecular force is influenced by the distance of separation between molecules. The forces significantly affect the interactions in solids and liquids, where the molecules are close together. In gases, IMFs become important only under high-pressure conditions (due to the proximity of gas molecules). Intermolecular forces dictate the physical properties of...
86.4K
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
