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相关概念视频

Formation of Complex Ions03:45

Formation of Complex Ions

23.0K
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...
23.0K
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

20.4K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
20.4K
EDTA: Auxiliary Complexing Reagents01:26

EDTA: Auxiliary Complexing Reagents

514
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...
514
Solubility of Ionic Compounds02:55

Solubility of Ionic Compounds

62.1K
Solubility is the measure of the maximum amount of solute that can be dissolved in a given quantity of solvent at a given temperature and pressure. Solubility is usually measured in molarity (M) or moles per liter (mol/L). A compound is termed soluble if it dissolves in water.
62.1K
Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

304
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...
304
Extraction: Advanced Methods00:56

Extraction: Advanced Methods

393
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...
393

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相关实验视频

Updated: May 15, 2025

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

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抗溶剂调节的阳离子协调使基电解质中的稳定金属阳极成为可能.

Xiaopeng Pei1,2, Ting Ou3, Yiju Li4

  • 1Wenzhou Institute, University of Chinese Academy of Sciences, Wenzhou, 325000, China.

Angewandte Chemie (International ed. in English)
|April 7, 2025
PubMed
概括
此摘要是机器生成的。

这项研究通过使用尿基电解质与LiNO3和TTE来增强金属电池的稳定性. 这改进了固体电解质介相 (SEI) 层,使电池寿命更长,效率更高.

关键词:
抗溶剂是一种抗溶剂.富含无机物质的SEI是一种无机物质.它们是LiNO3.金属电池的电池是金属的电池.基于尿素的溶剂溶剂

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Non-aqueous Electrode Processing and Construction of Lithium-ion Coin Cells
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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
  • 电池技术 电池技术

背景情况:

  • 稳定金属电池 (LMB) 需要通过酸盐 (NO3-) 离子溶解形成的富含无机固体电解质间相 (SEI) 层.
  • 酸 (LiNO3) 具有有限的溶解性,并且由于其高的捐赠者数量,挑战了NO3-协调,阻碍了其应用.

研究的目的:

  • 通过在以尿素为基础的LiNO3电解质中展示抗溶剂增强的阳离子协调效应来提高LMBs的循环稳定性.
  • 调查1,1,2,2-四乙烯-2,2,3,3-四乙烯 (TTE) 在修改溶解内的NO3-协调中的作用.

主要方法:

  • 以尿素为基础的LiNO3电解质的配方,添加了TTE.
  • 使用光谱或计算方法 (隐含) 分析溶解结构和NO3-协调.
  • 电化学测试的Li,Li,Li和LiFePO4电池,以评估循环稳定性和库伦比效率.

主要成果:

  • 加入TTE增强了Li+-NO3-相互作用,并促进了溶解中的离子对形成.
  • 3-离子从单酸盐转变为双酸盐的协调,有利于在阳极上优先降低酸盐.
  • 优化过的电解质可以在LCD电池中达到6000小时的运行时间,在LCD电池中达到99.6%的库伦比效率.
  • 在0.2C的100个循环后,LiFePO4全细胞保持了88%的容量.

结论:

  • 抗溶剂增强的阳离子协调是改善LMB中的SEI层的可行策略.
  • 经TTE改性尿素基电解质显著提高了金属阳极的电化学性能和稳定性.
  • 这种方法为开发高性能和持久的金属电池提供了有前途的途径.