相关实验视频
Updated: Jun 8, 2025

06:58
Zinc-Sponge Battery Electrodes that Suppress Dendrites
Published on: September 29, 2020
4.3K
分子协同效应调解高效的界面化学:为水性离子电池提供无树脂阳极
Yue-Ming Li1, Wen-Hao Li2, Kai Li3
1Jilin Provincial Key Laboratory of Organic Functional Molecular Design & Synthesis, Faculty of Chemistry, Northeast Normal University, Changchun, Jilin 130024, P. R. China.
Journal of the American Chemical Society
|November 4, 2024
概括
两个非同类酸添加剂产生"分子协同效应",以稳定水性离子电池 (AZIB) 的金属电解质接口. 这大大提高了电池的寿命和性能.
科学领域:
- 电化学
- 材料科学
- 能量储存
背景情况:
- 水性离子电池 (AZIB) 由于不稳定的金属电解质接口而遭受加速故障.
- 阐明多添加剂系统的机制及其协同效应仍然是一个重大挑战.
- 现有的多添加剂策略往往忽略了协同作用,从而限制了它们的整体疗效.
研究的目的:
- 为了调查
- 分子协同效应
- 两种非同类酸 (NAE) 添加剂用于稳定AZIB中的金属电解质接口.
- 阐明乙基甲基碳酸盐 (EMC) 和甲基酸盐 (MA) 在促进定向沉积和稳定的固体电解质介相 (SEI) 的特定作用.
- 通过优化电解质配方,提高AZIB的循环寿命和性能.
主要方法:
- 在电解质中使用乙基甲基碳酸盐 (EMC) 和甲基酸盐 (MA) 的双添加剂系统.
- 在双电层微空间内利用有针对性的吸附和分子相互作用.
- 分析由有机成分主导的原生SEI层的形成.
- 监测MA的自发水解,以减轻由演变反应 (HER) 引起的pH升高.
主要成果:
- 通过对 (002) 晶体平面的有针对性的吸附,EMC和MA添加剂协同促进定向沉积.
- 在EMC的协同作用下受MA减少的影响,形成了稳定,富含有机的SEI层.
- 通过MA水解有效地抵消HER的pH升高,防止副产品的形成.
- 优化的1E1M电解质将阳极循环寿命延长到3140个循环 (1 mA h cm-2在1 mA cm-2).
- 在700个循环后,Zn//MnO2充满电池的容量保持率达到了89.9%.
结论:
- 在
- 分子协同效应
- 在AZIB中显著提高了金属电解质接口的稳定性.
- 这种协同方法有效地解决了关键的故障机制,包括树突形成和电解质降解.
- 开发的电解质配方为延长AZIB寿命和改善其实际应用提供了一个有前途的策略.
相关概念视频
Formation of Complex Ions
23.4K
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...
23.4K
Standard Electrode Potentials
43.5K
On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...
43.5K
Intermolecular Forces
57.7K
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...
57.7K
Extraction: Advanced Methods
425
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
425
Aryldiazonium Salts to Azo Dyes: Diazo Coupling
2.9K
The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the...
2.9K
Interfacial Electrochemical Methods: Overview
221
Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current...
221

