对硫烯离子液体作为电解质用于电气双层电容器的分子动力学研究
Siqi Wang1, Zhuo Li1, Guangmin Yang1
1College of Physics, Changchun Normal University Changchun 130032 China yangguangmin@mail.ccsfu.edu.cn linjy994@nenu.edu.cn.
RSC advances
|October 16, 2023
概括
硫烯酸离子液体 (ILs) 的结构修改提高了超级电容器的性能. 更小,不对称的IL可以提高导电性和电化学性能,为先进的储能解决方案铺平道路.
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
- 计算化学计算化学
背景情况:
- 超级电容器对于储能至关重要,有离子液体 (IL) 具有稳定性和宽的电化学窗口等优势.
- 超级电容器中的传统IL面临功率密度的限制,原因是粘度诱导的低导电性.
- 硫ILs因其低毒性和出色的稳定性而闻名,这使得它们对储能具有吸引力.
研究的目的:
- 研究结构改造作为一种提高硫尼尔ILs的储能性能的策略.
- 探索IL结构 (大小,对称性) 和与超级电容器功能相关的关键性质之间的关系.
- 为改进超级电容应用优化硫IL的设计原则.
主要方法:
- 经典分子动力学 (MD) 模拟被用于研究四种不同的硫ILs.
- 系统地研究包括离子导电性,接口结构和双层电容在内的属性.
- 分析重点是自我扩散系数及其与结构参数的相关性.
主要成果:
- 硫ILs的较小分子尺寸和增加的不对称性显著提高了自我扩散系数和离子导电性.
- 这些结构修改导致超级电容器模型的电化学性能得到改善.
- 还发现电极修改进一步提高了电容性能.
结论:
- 硫ILs的结构定制是一种有效的方法,可以克服导电性限制并提高超级电容器的性能.
- 为开发下一代电解质,建议采用有利于较小,不对称的IL结构的设计原则.
- 这项研究为先进的能量存储设备中硫IL的合理设计提供了基本的见解.
相关概念视频
Dielectric Polarization in a Capacitor
4.7K
The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
4.7K
Molecular Shape and Polarity
60.5K
Dipole Moment of a Molecule
60.5K
Ionic Bonding and Electron Transfer
41.7K
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.
41.7K
Electrostatic Boundary Conditions in Dielectrics
1.2K
When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's...
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's...
1.2K
Capacitor With A Dielectric
4.0K
Parallel plate capacitors consist of two conducting plates separated by a certain distance. However, it is mechanically difficult to hold the large plates parallel to each other without actual contact. Hence, a dielectric layer is commonly placed between the plates, which provides an easy solution for holding the plates together with a small gap and increases the capacitance of the capacitor.
Dielectrics are non-conducting materials with no free or loosely bound electrons. When a dielectric is...
Dielectrics are non-conducting materials with no free or loosely bound electrons. When a dielectric is...
4.0K
Electrolyte and Nonelectrolyte Solutions
63.2K
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.
63.2K


