聚硫化物的分裂-沉化学及其与高溶解电解质中阴极-电解质间相的动态演变相关
Luyi Chen1, Jiawei Lai1, Xiaoxian Guan1
1School of Chemistry, Guangzhou Key Laboratory of Materials for Energy Conversion and Storage, South China Normal University, 55 West Zhongshan Rd., Guangzhou, 510006, China.
Angewandte Chemie (International ed. in English)
|January 16, 2025
概括
这项研究引入了六甲基酸 (HMPA) 作为辅溶剂,以提高硫 (Li-S) 电池的性能. 电解质工程通过控制硫化沉积和相间演变来提高硫的利用率和循环稳定性.
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:
- 硫 (Li-S) 电池在理论上具有很高的能量密度,但面临着挑战.
- 阴极-电解质间相的不稳定性和Li2S的过早被动化限制了实际应用.
- 不良的循环稳定性和低硫利用率阻碍了Li-S电池的开发.
研究的目的:
- 提出一种使用甲 (HMPA) 作为辅溶剂的电解质工程策略.
- 为了阐明多硫化物 (LiPSs) 的解离-沉化学.
- 为了提高Li-S电池的硫利用和循环稳定性.
主要方法:
- 使用HMPA辅溶剂进行电解质工程.
- 多模光学光谱仪用于研究LiPSs溶解和转化途径.
- 放松时间的分布 (DRT) 和X射线光电子光谱 (XPS) 来分析阴极-电解质间相.
主要成果:
- HMPA有效调节LiPSs溶解,启动一个基因辅助的转化途径.
- 控制的三维 (3D) Li2S 电极沉积可以提高硫的利用率.
- 观察到抑制Li2S被动化和增强的转化可逆性.
- 一个Li-S电池实现了高面积容量7.86 mAh cm-2的高硫负载.
结论:
- 使用HMPA的电解质工程是推进Li-S电池技术的可行策略.
- 该方法解决了诸如相间不稳定性和Li2S被动化等关键挑战.
- 证明了高性能意味着向实用的高能量密度Li-S电池取得了进展.
相关概念视频
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
Electrolyte and Nonelectrolyte Solutions
62.2K
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.
62.2K
Formation of Complex Ions
23.2K
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...
23.2K
Precipitation and Co-precipitation
1.7K
Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
1.7K
Precipitation of Ions
27.5K
Predicting Precipitation
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
27.5K
Solubility Equilibria: Overview
587
When a substance such as sodium chloride is added to water, it dissolves, forming an aqueous solution. The extent of dissolution is called solubility. The process of dissolution can exist in equilibrium, just like other chemical processes. Solubility equilibria are also called precipitation equilibria because the process of solubility can be reversible. The reverse of the solubility process is called precipitation.
Solubility is important in biological and environmental processes. A notable...
Solubility is important in biological and environmental processes. A notable...
587


