在表面上的DMC/EC,EMC/EC和DEC/EC二元混合物的分解;GC,XPS和计算
Leonie Wildersinn1, Daniel Stottmeister2, Fabian Jeschull1
1Institute for Applied Materials, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
ACS applied materials & interfaces
|January 31, 2025
概括
调查离子电池中的金属反应性揭示了电解质降解和解释半细胞测试结果的挑战,这是由于表面层的形成.
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:
- 离子电池 (KIB) 提供低成本,高能储能潜力.
- 快速的离子导电性和高工作电压是KIB的关键优势.
- 用金属进行半细胞试验至关重要,但容易产生误解.
研究的目的:
- 用常见的KIB电解质系统地研究金属表面的反应性.
- 识别电解质降解产物及其形成途径.
- 了解这些反应对KIB半细胞测试的影响.
主要方法:
- 质谱测量用于识别电解质降解物种.
- 密度函数理论 (DFT) 计算以评估反应路径.
- X射线光电子光谱 (XPS) 用于分析表面层组成.
主要成果:
- 确定了关键的电解质降解物种:功能化碳酸盐,以太桥式碳酸盐和以太类化合物.
- DFT计算阐明了这些物种的潜在形成途径.
- 在K2CO3,KOH和R-OK物种的金属上,XPS揭示了一种富含无机物质的固体电解质介相 (SEI).
结论:
- 金属很容易形成表面层 (KOH,K2CO3) 并与电解质反应.
- 电解质降解显著复杂化了KIB半细胞测试的解释.
- 了解这些表面反应对于推进KIB技术至关重要.
相关概念视频
Capillary Electrophoresis: Applications
323
Capillary electrophoretic separations offer various modes, each with unique applications. These modes include capillary zone electrophoresis, capillary gel electrophoresis, capillary array electrophoresis, capillary isoelectric focusing, capillary isotachophoresis, micellar electrokinetic chromatography, and capillary electrochromatography.
Capillary zone electrophoresis (CZE) separates ionic components based on their electrophoretic mobility. It has been used to separate proteins, amino acids,...
Capillary zone electrophoresis (CZE) separates ionic components based on their electrophoretic mobility. It has been used to separate proteins, amino acids,...
323
Mass Spectrometry: Complex Analysis
699
Mass spectrometry is an important technique for the identification of pure compounds. However, it has some limitations for the analysis of complex mixtures, often due to excessive fragmentation making the spectrum too complicated to decipher. Mass spectrometry can be combined with suitable separation methods in sequence, forming hyphenated methods, which are useful in the analysis of complex mixtures.
GC–MS is a powerful hyphenated method commonly used in forensics and environmental...
GC–MS is a powerful hyphenated method commonly used in forensics and environmental...
699
Chemical Ionization (CI) Mass Spectrometry
678
The molecular ion peak of a molecule in the mass spectrum provides vital information for molecular identification. However, conventional electron impact ionization can lead to the rapid dissociation of some molecular ions before they reach the detector. A milder ionization method is required to increase the lifetime of such ionized analyte molecules. Chemical ionization (CI) is a gas-phase protonation reaction useful for mass-analyzing analyte molecules that are easily protonated to yield the...
678


