通过调节溶剂离子相互作用来实现稳定的离子电池
Lei Ma1,2, Xusheng Wang1, Shengbin Wang1
1Shijiazhuang Shangtai Technology Co., Ltd, Shijiazhuang, 052461, China. wxs56575859@163.com.
Chemical communications (Cambridge, England)
|November 24, 2025
概括
在1,2-二氧化乙 (DEE) 电解质中的二硫胺 (KFSI) 显示出独特的相互作用. 这导致稳定的固体电解质介相和石墨阳极中的潜在溶剂共介相.
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
- 物理化学 物理化学
背景情况:
- 了解电解质的行为对于先进的电池技术至关重要.
- 离子电池 (KIB) 和离子电池 (LIB) 使用各种电解质组件.
- 溶解结构显著影响接口反应和电池性能.
研究的目的:
- 为了研究1,2-二二氧乙 (DEE) 中二 () 硫胺 (KFSI) 的独特溶解结构.
- 将这些相互作用与其他涉及离子和不同溶剂的电解质系统进行比较.
- 阐明这些相互作用在固体电解质介相 (SEI) 形成和溶剂共介相中的作用.
主要方法:
- 离子-溶剂相互作用的计算建模.
- 分析溶解结构 (例如,K+,Li+,FSI-,DEE,DME) 的分析.
- 对KFSI/DEE与KFSI/DME,LiFSI/DEE和LiFSI/DME电解质进行比较.
主要成果:
- 该KFSI/DEE电解质表现出独特的DEE-K+-FSI相互作用,与基于DME或基于Li+的系统不同.
- FSI-离子在界面反应中起着重要作用,有助于稳定的SEI.
- 从K+溶解中观察到完整的DEE分子的优先溶解,与FSI-溶解不同.
结论:
- 在KFSI/DEE中独特的溶解结构负责增强SEI形成.
- 这种溶解行为可以解释在LiFSI/DEE和KFSI/DME电解质中观察到的溶剂对石墨阳极的协同插曲.
- 对特定离子-溶剂相互作用的进一步研究可以优化高性能电池的电解质设计.
相关概念视频
02:12Solvating Effects
8.4K
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...
8.4K
01:17Ion Exchange
1.1K
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...
1.1K
01:19Ionic Strength: Effects on Chemical Equilibria
2.5K
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...
In this solution, the primary...
2.5K
03:00Electrolysis
30.1K
In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
30.1K
03:24Common Ion Effect
45.5K
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Châtelier’s principle. Consider the dissolution of silver iodide:
45.5K
03:13Intermolecular Forces
68.8K
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...
68.8K