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相关概念视频

Ionic Strength: Effects on Chemical Equilibria01:19

Ionic Strength: Effects on Chemical Equilibria

1.5K
The addition of an inert ionic compound increases the solubility of a sparingly soluble salt. For example, adding potassium nitrate to a saturated solution of calcium sulfate significantly enhances the solubility of calcium sulfate. Le Châtelier's principle cannot predict this shift in the equilibrium. Instead, this could be explained in terms of changes in the effective concentration of the ions in solution in the presence of added inert salt.
In this solution, the primary...
1.5K
Ionic Bonding and Electron Transfer02:48

Ionic 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
Formation of Complex Ions03:45

Formation 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
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

20.9K
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...
20.9K
Ionic Crystal Structures02:42

Ionic Crystal Structures

14.4K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
14.4K
Ionic Bonds00:42

Ionic Bonds

118.6K
Overview
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
Ionic bonds are reversible electrostatic interactions between ions...
118.6K

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相关实验视频

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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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固体电解质相间结构由功能电解质添加剂调节,以提高Li金属阳极性能.

Hui Chen1, Yu-Xiang Xie1, Shi-Shi Liu1

  • 1College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.

ACS applied materials & interfaces
|September 21, 2023
PubMed
概括

一种新的功能性电解质添加剂,PANHF,有效地防止高能量密度电池中的树的生长. 这种双聚合物添加剂增强了下一代金属电池的循环稳定性和容量保留.

关键词:
沉积/溶解反应反应金属阳极是一种金属阳极.电解质添加剂的电解质添加剂聚合聚合的过程中.固体电解质相间阶段

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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
  • 聚合物化学 聚合物化学

背景情况:

  • (Li) 金属阳极对于高能量密度电池至关重要,但受到树状物生长和不稳定的固体电解质介相层 (SEI) 的影响.
  • 这些问题限制了金属电池的安全性和循环寿命,阻碍了它们的商业化.

研究的目的:

  • 合成和评估一种新的功能性电解质添加剂,PANHF,以提高Li金属阳极性能.
  • 研究PANHF增强金属阳极及其固体电解质介相稳定的机制.

主要方法:

  • 通过聚合烯和六布基甲酸盐合成PANHF.
  • 用含有PANHF的电解质对Li/Li细胞和Li/NCM811细胞进行电化学表征.
  • 在PANHF的存在下形成的固体电解质介相的分析特征.

主要成果:

  • PANHF显著提高了沉积/溶解的可逆性和库伦比效率.
  • 通过形成双层SEI (有机外层,LiF内层),PANHF有效地抑制了Li树突的生长.
  • 使用0.5%重量的PANHF的Li/Li细胞在1.0mA cm-2下完成了700个循环,Li/NCM811细胞在200个循环后保持了83.41%的容量.

结论:

  • PANHF是一种高效的功能电解质添加剂,用于稳定金属阳极.
  • 双聚合物添加剂战略为开发下一代高性能和安全的金属电池提供了一个有前途的途径.