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相关概念视频

Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

42.5K
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. 
42.5K
Formation of Complex Ions03:45

Formation of Complex Ions

24.0K
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...
24.0K
Ionic Bonds00:42

Ionic Bonds

122.2K
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...
122.2K
Ion Exchange01:17

Ion Exchange

670
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...
670
Interfacial Electrochemical Methods: Overview01:06

Interfacial Electrochemical Methods: Overview

455
Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current...
455
Intermolecular Forces03:13

Intermolecular Forces

61.4K
Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
61.4K

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相关实验视频

Updated: Sep 19, 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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全面的阴离子界面封闭策略,以调节金属电池的坚固固体电解质界面.

Haipeng Zhu1, Wenran Wang1, Baolei Xu1

  • 1State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, Hunan, P. R. China.

ACS applied materials & interfaces
|June 17, 2025
PubMed
概括

研究人员开发了一种用于金属电池的铁电复合材料分离器. 这种分离器通过控制离子行为和在阳极上形成保护层来增强稳定性和循环寿命.

关键词:
离子界面的限制限制的树突是的树突.金属电池的金属电池是什么修改了功能分离器的功能分离器固体-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
  • 储能 储能 储能 储能 储能 储能

背景情况:

  • 金属电池 (LMB) 面临性能和安全问题,原因是金属的反应性和不均的Li+沉积/剥离.
  • 现有的分离器往往无法应对这些挑战,限制了LMB的周期寿命和稳定性.

研究的目的:

  • 设计和制造一个多功能铁电复合材料分离器,以提高LMB的性能.
  • 研究铁电分离器调节固体电解质间相 (SEI) 和离子传输的机制.

主要方法:

  • 使用铁电β-聚乙烯化物 (β-PVDF) 制造复合材料分离器,具有定向二极管排列.
  • 分离器的特性和由此产生的金属阳极上的SEI层的表征.
  • 电化学测试Li的水晶电池对称电池和全电池 (用LiFePO4阴极),以评估性能和稳定性.

主要成果:

  • 在β-PVDF分离器中的定向二极体诱导了离子界面的限制,并促进了完全的盐减少.
  • 在金属阳极上形成了一个强大的,富含无机的SEI层,确保了均的Li+分布和高的接口稳定性.
  • 一个对称的单元实现了超过4000小时的稳定循环,一个完整的单元在960个循环后保持了96.84%的容量.

结论:

  • 铁电复合材料分离器有效地提高了金属电池的稳定性和循环寿命.
  • 该策略提供了一种新的方法来调节SEI化学,使用功能涂层和多物理场来控制离子迁移.