可控制的固体电解质间相通过离子环境 稳定的离子电池规则
Jingwen Liu1,2, Caixia Li1,3, Kai Zhang1,2
1State Key Laboratory Base of Eco-Chemical Engineering, International Science and Technology Cooperation Base of Eco-chemical Engineering and Green Manufacturing, Qingdao University of Science and Technology, Qingdao, 266042, P. R. China.
Small (Weinheim an der Bergstrasse, Germany)
|December 10, 2023
概括
人工固体电解质间相 (SEI) 层增强水性电池. 铁酸在特定的离子环境中形成一个保护性SEI,使稳定,长循环电池.
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
- 电池技术 电池技术
背景情况:
- 人工固体电解质间相 (SEI) 层对于稳定的水性离子电池至关重要.
- 了解离子环境对SEI形成的影响对于优化电池性能至关重要.
- 以前的研究还没有完全探索不同的离子条件如何影响SEI特性和电池循环.
研究的目的:
- 研究各种离子环境对人工SEI层的形成和特性的影响.
- 分析离子环境,反应自发性和SEI有效性之间的关系.
- 描述阳极上的SEI层的保护机制.
主要方法:
- 使用甲酸 (PA) 作为有机连接体,在不同的离子条件下与Zn2+协调.
- 分析不同离子环境中的反应自发性.
- 制造和测试PA-Zn对称细胞和PA-Zn//MVO全细胞.
主要成果:
- 在pH 4的PA溶液中,缺乏氧化离子 (OH-),形成密集的超薄SEI层,具有有效的Zn-PA协调.
- 这种SEI层成功地防止了阳极和电解质之间的直接接触.
- 在SEI中的有机功能组促进了Zn2+的均流动,在一个对称的细胞中,在3 mA cm-2的温度下,能够稳定循环超过3500小时.
- 这种PA-Zn//MVO全细胞表现出极好的电化学可逆性.
结论:
- 离子环境对水性离子电池的SEI产生和效率有很大影响.
- 优化离子条件,例如在pH 4使用PA,可以导致优异的SEI形成和增强电池稳定性.
- 这项研究为开发用于先进的基于的储能系统的新型SEI战略提供了宝贵的见解.
相关概念视频
00:42Ionic Bonds
118.5K
Overview
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
Ionic bonds are reversible electrostatic interactions between ions...
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
Ionic bonds are reversible electrostatic interactions between ions...
118.5K
03:45Formation of Complex Ions
23.7K
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...
23.7K
02:48Ionic 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
01:12Ionic Strength: Overview
1.4K
The ionic strength of a solution is a quantitative way of expressing the total electrolyte concentration of a solution. This concept was first introduced in 1921 by two American physical chemists, Gilbert N. Lewis and Merle Randall, while describing the activity coefficient of strong electrolytes. During the calculation of ionic strength (I or μ), all the cations and anions are considered. However, the concentration (c) of an ion with a greater charge number (z) has a greater contribution...
1.4K
01:19Ionic Strength: Effects on Chemical Equilibria
1.5K
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...
1.5K
03:02Standard Electrode Potentials
43.9K
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...
43.9K