通过离子加速层修改的分离器定制Zn2+流量,用于高速长效Zn金属阳极
Yicheng Tan1,2, Duo Chen1, Tengyu Yao1
1Jiangsu Key Laboratory of Electrochemical Energy Storage Technologies, College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|October 8, 2024
概括
一种新型的离子加速层通过调节离子流量,有效地抑制了金属阳极中树脂的生长. 这种分离器工程策略提高了电池的稳定性和性能,特别是在高电流密度下.
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:
- 金属阳极的离子运输缓慢会导致度梯度,导致离子 (Zn2+) 流量不均和树增长.
- 树岩的形成是高性能和安全的基电池的主要挑战,特别是在高电流密度下.
研究的目的:
- 通过分离器工程引入离子加速层,以调节 Zn2+ 流量并实现无树沉积.
- 为了提高金属阳极的稳定性和循环性能.
主要方法:
- 开发一个易于分离器的工程策略,使用六酸作为修饰剂.
- 通过测量离子导电性,激活能量和 Zn2+ 转移数来研究离子加速效应.
- 在各种电流密度下测试Zn har har har har Zn对称电池和带有修改分离器的完整电池.
主要成果:
- 用六酸酸盐修改的分离器有助于快速捕获和运输Zn2+,减少度梯度.
- 证明了改善的离子导电性,降低了激活能量,并提升了Zn2+转移数.
- 在对称细胞中达到长期稳定性 (2700小时在2mA cm-2下,1770小时在10mA cm-2下) 和在完整细胞中提高性能.
结论:
- 离子加速层有效地引导同质的Zn2+流量,使得没有树突的沉积成为可能.
- 分离器工程为强大的金属阳极提供了可扩展的方法,适合高电流密度应用.
- 该策略在各种电池配置中显著提高了循环稳定性和速率能力.
相关概念视频
03:02Standard Electrode Potentials
37.5K
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...
37.5K
01:08Electrodeposition
2.6K
Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
Electrodeposition can...
2.6K
00:56Extraction: Advanced Methods
1.2K
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...
1.2K
01:17Ion Exchange
1.5K
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
1.5K
01:09Ion-Exchange Chromatography
2.9K
Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
2.9K
01:24Electrochemical Systems
169
Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution,...
169