通过化分离器接口调解三离子迁移行为,朝向高度可逆的水性电池
Fang Shen1, He Du1, Hongyu Qin1
1Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, Guangxi Key Laboratory of Electrochemical Energy Materials, School of Chemistry and Chemical Engineering, Guangxi University, Nanning, 530004, P. R. China.
Small (Weinheim an der Bergstrasse, Germany)
|September 1, 2023
概括
一种新的化分离器接口 (PVDF@GF) 有效地抑制水性离子电池 (AZIB) 中的树生长和腐蚀. 这一策略增强了沉积,并显著提高了电池循环稳定性和性能.
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:
- 水性离子电池 (AZIB) 由于不受控制的离子迁移而表现不佳,导致阳极的树突生长,被动化和腐蚀.
- 应对这些挑战对于推进AZIB技术至关重要.
研究的目的:
- 开发一种有效的策略来稳定AZIB中的阳极.
- 通过控制离子迁移来提高AZIB的循环稳定性和整体性能.
主要方法:
- 通过将聚乙二 (PVDF) 接入玻璃纤维 (GF) 表面,构建化分离器接口 (PVDF@GF).
- 实验和理论研究,以调查PVDF@GF接口和离子 (Zn2+,SO42-,H+) 的相互作用.
主要成果:
- PVDF@GF接口通过增强 Zn2+ 离子度再分配和运输动力学来促进同质和快速的沉积.
- 分离器接口有效地排斥SO42-并定H+,减轻阳极被动和腐蚀.
- 一个对称的Zn的电池表现出卓越的循环稳定性 (500小时在10 mAh cm-2),而一个Zn的完整电池在1000个循环后保持了76.8%的容量.
结论:
- 化分离器接口 (PVDF@GF) 为AZIB中的阳极问题提供了全面的解决方案.
- 这项工作为设计具有离子选功能的先进分离器提供了洞察力,用于稳定和可逆的金属阳极化学.
相关概念视频
01:17Ion Exchange
621
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...
621
00:56Extraction: Advanced Methods
482
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...
482
01:09Ion-Exchange Chromatography
577
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...
577
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
41.7K
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.
41.7K
03:12Batteries and Fuel Cells
27.6K
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...
27.6K