用于硫电池的基于Hückel离子的缩电解质
Aginmariya Kottarathil1,2,3, N Tan Luong2, Carolina Cruz Cardona2
1Warsaw University of Technology, Faculty of Chemistry, 00664, Warszawa, Poland. aginmariya.kottarathil@pw.edu.pl.
Physical chemistry chemical physics : PCCP
|August 21, 2025
概括
基于Hückel离子的盐通过减少聚硫化物问题来改善硫电池. 这些电解质中的较高盐度提高了稳定性和性能,减轻了更好的能量储存的穿效应.
科学领域:
- 电化学
- 材料科学
- 能量储存
背景情况:
- -硫 (Li-S) 电池具有较高的理论能量密度,但受到多硫化物转移的影响.
- 传统的电解质,如二三甲 (LiTFSI) 的电解质,难以抑制这一问题.
- 基于Hückel离子的盐被探索为Li-S电池的先进电解质组件.
研究的目的:
- 系统地研究用于Li-S电池的DOL:DME溶剂中的基于Hückel离子的电解质 (LiTDI,LiPDI,LiHDI).
- 了解盐度对离子协会,溶解和电化学性能的影响.
- 使用先进的光谱和建模技术阐明聚硫化物减缓的机制.
主要方法:
- 电池性能评估的电化学循环测试
- 拉曼光谱 (包括操作) 来研究聚硫化物 (LiPS) 的演变.
- 对电解质特性进行离子导电性和粘度测量.
- 分子动力学 (MD) 模拟用于离子溶解分析.
- 用COSMO-RS模型进行溶解性预测.
主要成果:
- 基于Hückel离子的电解质在Li-S细胞中表现出稳定的放电能力.
- 发现盐度的增加降低了LiPS的溶解度,并减缓了其溶解和扩散.
- MD模拟证实了DME的优先+溶解,影响了离子行为.
- 拉曼光谱和COSMO-RS模型证实了LiPS航天飞机效应的缓解.
结论:
- 基于Hückel离子的电解质,特别是在较高度下,有效地抑制了Li-S电池中的LiPS转运.
- 这些电解质为提高Li-S电池性能和稳定性提供了一个有希望的替代品.
- 这些发现为开发下一代高性能Li-S电池技术铺平了道路.
更多相关视频
11:04Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
Published on: December 20, 2016
13.1K
10:03Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
Published on: November 11, 2013
25.6K
相关概念视频
Batteries and Fuel Cells
28.0K
A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
28.0K
Formation of Complex Ions
24.0K
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
24.0K
Electrolyte and Nonelectrolyte Solutions
63.8K
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.
63.8K
Ions as Acids and Bases
24.0K
Salts with Acidic Ions
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
24.0K
Ion Exchange
658
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
658
Ionic Bonding and Electron Transfer
42.2K
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.
42.2K
