相关实验视频
Updated: May 30, 2025

06:58
Zinc-Sponge Battery Electrodes that Suppress Dendrites
Published on: September 29, 2020
4.3K
脱氧化聚乙烯酒精分离器使金属电池中的快速动力学成为可能
Yao Qin1,2, Fuhua Yang1,2, Jodie A Yuwono3
1Helmholtz Institute Ulm (HIU), Helmholtzstrasse 11, 89081, Ulm, Germany.
Small (Weinheim an der Bergstrasse, Germany)
|January 27, 2025
概括
一种新的脱氧化策略增强了金属电池 (ZMB) 的聚乙醇 (PVA) 分离器. 这提高了离子导电性和均的沉积,延长了电池的寿命,减少了极化.
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:
- 分离器对于金属电池 (ZMB) 来说至关重要.
- 玻璃纤维分离器缺乏机械稳定性和树抑制.
- 聚合物分离器具有机械优势,但由于离子运输和湿透性差,因此受到损害.
研究的目的:
- 通过修改聚乙醇 (PVA) 来开发ZMBs的改进分离器.
- 为了克服现有的PVA分离器的局限性,特别是缓慢的离子传输和糟糕的湿透性.
- 提高ZMB的电化学性能和循环寿命.
主要方法:
- 使用脱氧化策略创建了脱氧化PVA基膜 (DHPVA).
- 在低温中在缩的性溶液中合成DHPVA,减少基团和链间结.
- 在不对称 (Cu/Zn,Zn/Zn) 和完全 (Zn/NaV3O8) 细胞中评估了电化学性能.
主要成果:
- DHPVA分离器显示显著增强的离子导电性 (20°C时12.5mS cm−1),几乎是原始PVA的四倍.
- DHPVA证明有效地促进了均的沉积,抑制了树突的形成.
- 在使用DHPVA分离器的ZMB中观察到偏振减少和循环寿命显著延长.
结论:
- 脱氧化策略有效地减少了PVA中的结,从而提高了离子导电性.
- DHPVA分离器为提高金属电池的性能和耐用性提供了一个有希望的解决方案.
- 这种简单而有效的方法为先进的ZMB分离器开发提供了新的途径.
相关概念视频
Extraction: Advanced Methods
403
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...
403
Electrodeposition
576
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...
576
Standard Electrode Potentials
43.3K
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...
43.3K
Ion Exchange
532
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...
532
Batteries and Fuel Cells
26.9K
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...
26.9K
Voltaic/Galvanic Cells
56.6K
Spontaneous Chemical Reactions
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
56.6K

