通过可充电电池的共价有机框架进行有机催化化氧化
Yan Xu1,2, Mingming Wang2, Muhammad Sajid2
1College of Energy, Soochow Institute for Energy and Materials Innovations, Light Industry Institute of Electrochemical Power Sources, Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province, Soochow University, Suzhou, Jiangsu 215006, China.
Angewandte Chemie (International ed. in English)
|December 5, 2023
概括
研究人员开发了一种新的氨基功能化共价有机框架 (COF-NH2) 催化剂,用于可充电 (Li-Cl2) 电池. 这种COF-NH2显著改善了LiCl氧化动力学,为高能储存提供了更高的容量和更长的循环寿命.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 可充电的 (Li-Cl2) 电池具有高能量密度的潜力.
- 实现合理的循环寿命受到化 (LiCl) 慢慢氧化为 (Cl2) 的阻碍.
研究的目的:
- 开发一种催化剂,降低LiCl氧化屏障,增强Li-Cl2细胞中的反应动力学.
- 改进Li-Cl2电池的性能指标,包括容量和周期寿命.
主要方法:
- 一种具有催化性质的氨基功能化共价有机框架 (COF-NH2) 的合成.
- 将COF-NH2集成到Li-Cl2电池架构中,用于性能评估.
- 电化学测试,以评估超电位,放电能力,LiCl利用率,循环稳定性和库伦比效率.
主要成果:
- 这种COF-NH2催化剂显著降低了LiCl的氧化过度潜力.
- 该Li-Cl2@COF-NH2电池实现了3500 mAh/g的超高放电容量,在第一个循环中使用了81.4%的LiCl.
- 经过200个周期的稳定循环在2000mAh/g和-20°C下被证明是稳定的,几乎100%的库伦比克效率和3.5V的放电平原.
结论:
- 胺基功能化COF-NH2作为有效的有机催化剂,加速Li-Cl2电池中的LiCl氧化.
- 这一进步使得高能量密度和更好的循环稳定性成为可能,为先进的储能解决方案铺平了道路.
相关概念视频
Ionic Bonding and Electron Transfer
41.6K
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.
41.6K
Acid Halides to Alcohols: LiAlH4 Reduction
2.8K
Acid halides are reduced to alcohols in the presence of a strong reducing agent like lithium aluminum hydride.
The mechanism proceeds in three steps. First, the nucleophilic hydride ion attacks the carbonyl carbon of the acid halide to form a tetrahedral intermediate. Next, the carbonyl group is re-formed, and the halide ion departs as a leaving group, generating an aldehyde. A second nucleophilic attack by the hydride yields an alkoxide ion, which, upon protonation, gives a primary alcohol as...
The mechanism proceeds in three steps. First, the nucleophilic hydride ion attacks the carbonyl carbon of the acid halide to form a tetrahedral intermediate. Next, the carbonyl group is re-formed, and the halide ion departs as a leaving group, generating an aldehyde. A second nucleophilic attack by the hydride yields an alkoxide ion, which, upon protonation, gives a primary alcohol as...
2.8K
Thermal and Photochemical Electrocyclic Reactions: Overview
2.3K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
2.3K
Batteries and Fuel Cells
27.5K
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...
27.5K
Oxidation and Reduction of Organic Molecules
6.7K
Energy production within a cell involves many coordinated chemical pathways. Most of these pathways are combinations of oxidation and reduction reactions, which occur at the same time. An oxidation reaction strips an electron from an atom in a compound, and the addition of this electron to another compound is a reduction reaction. Because oxidation and reduction usually occur together, these pairs of reactions are called redox reactions.
The removal of an electron from a molecule, results in a...
The removal of an electron from a molecule, results in a...
6.7K


