相关实验视频
Updated: Jul 5, 2025

06:58
Zinc-Sponge Battery Electrodes that Suppress Dendrites
Published on: September 29, 2020
4.3K
可极化添加剂,具有中级化强度,用于稳定的水性离子电池
Yuting Xia1, Rongao Tong1, Jingxi Zhang1
1State Key Lab of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, People's Republic of China.
Nano-micro letters
|January 12, 2024
概括
研究人员开发了一种用于水性离子电池的新型电解质添加剂. 这种添加剂通过防止树突形成和副作用反应来增强电池的稳定性和循环寿命,为更安全,更持久的能量存储铺平了道路.
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 (AZIBs) 提供安全性,低成本和高容量,但受到树形成和副作用的影响.
- 这些问题限制了AZIB的循环寿命和储存稳定性,阻碍了它们的实际应用.
研究的目的:
- 设计和评估一种电解质添加剂,以提高AZIBs的电化学稳定性.
- 为了抑制金属阳极 - 电解质接口上的树突形成和副作用.
- 改善AZIBs的整体周期寿命和性能.
主要方法:
- 含有特定化添加剂的水性电解质配方,五-二乙烯-三氨五酸盐.
- 电化学测试Zn的对称电池,以评估长期稳定性.
- 在循环条件下对ZnH4V4O10全细胞的性能评估.
- 对添加剂对离子溶解,沉积和接口被动化的作用的分析.
主要成果:
- 添加剂有效地抑制了的演变,过度潜在的增长和树岩的形成.
- 对称的Zn单元在1 mA cm−2.2.n下经过3500多个小时的稳定运行.
- 在500个循环以1Ag-1.1的温度后,ZnBodyNetNetNetNH4V4O10全细胞表现出84.6%的容量保留.
- 添加剂修改了Zn2+的扩散和沉积,导致高度可逆的Zn电极.
结论:
- 开发的电解质添加剂具有中间化强度,显著提高了AZIBs的电化学稳定性.
- 这种方法为设计可靠的电解质,用于高性能和安全的水性电池提供了一个实用的策略.
- 这些发现有助于克服AZIB技术的关键挑战,促进其商业可行性.
相关概念视频
Extraction: Advanced Methods
447
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...
447
Ion Exchange
592
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...
592
Complexation Equilibria: Factors Influencing Stability of Complexes
372
In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
372
EDTA: Auxiliary Complexing Reagents
589
EDTA titrations are usually carried out in highly basic conditions, where the fully deprotonated form of EDTA, Y4−, actively complexes with the free metal ions in the solution. Several metal ions precipitate as hydrous oxide (hydroxides, oxides, or oxyhydroxides) under these conditions, lowering the concentration of free metal ions in the solution. For this reason, auxiliary complexing agents or ligands such as ammonia, tartrate, citrate, or triethanolamine are used in EDTA titrations to...
589
Formation of Complex Ions
23.6K
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...
23.6K
Complexation Equilibria: The Chelate Effect
518
In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
518

