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相关概念视频

The Electrical Double Layer01:30

The Electrical Double Layer

In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
Weak Acid Solutions04:02

Weak Acid Solutions

Few compounds act as strong acids. A far greater number of compounds behave as weak acids and only partially react with water, leaving a large majority of dissolved molecules in their original form and generating a relatively small amount of hydronium ions. Weak acids are commonly encountered in nature, being the substances partly responsible for the tangy taste of citrus fruits, the stinging sensation of insect bites, and the unpleasant smells associated with body odor. A familiar example of a...
Processes at Electrodes01:30

Processes at Electrodes

The electrode interacts with ions in the electrolyte solution at its interface. The rate of oxidation and reduction depends on the speed at which electrons can transfer through this interface. As ions attach to or leave the electrode surface, the electrode acquires a charge, and an electrical potential forms across the interface, making the process more difficult to reach equilibrium. The charge on the electrode affects the local ion concentrations in the solution, though thermal motion...
Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

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.
Formation of Complex Ions03:45

Formation of Complex Ions

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...
Electrochemical Systems01:24

Electrochemical Systems

Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution, the Zn metal, composed...

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在电池反应过程中,LiMn2O4/电解质接口的动态结构变化.

Masaaki Hirayama1, Hedekazu Ido, KyungSu Kim

  • 1Department of Electronic Chemistry, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8502, Japan.

Journal of the American Chemical Society
|October 14, 2010
PubMed
概括
此摘要是机器生成的。

了解电池电极表面反应是更好的电池的关键. 新的研究使用表面X射线衍射来揭示初始电化学反应期间的动态结构变化和表面重建.

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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
  • 表面科学是一门学科.

背景情况:

  • 设计高功率,寿命长的电池需要了解电极表面反应.
  • 目前的方法往往缺乏对动态表面结构变化的直接观察.

研究的目的:

  • 开发和应用一种技术,直接观察电池电极材料的表面结构变化.
  • 在电化学反应过程中研究表轴LiMn(2) O(4) 薄膜的动态表面结构变化.

主要方法:

  • 脉冲激光沉积用于在SrTiO3基板上生长表轴LiMn{2}O{4}薄膜.
  • 在现场使用表面X射线衍射 (SXRD) 来实时监测表面结构动态.
  • 传输电子显微镜 (TEM) 用于循环后分析.

主要成果:

  • 在初始电化学反应期间,在电极表面观察到动态结构变化,包括减少原子对称性.
  • 表面重建和电气双层形成发生在电压应用后.
  • 固体电解质接口 (SEI) 层在 (111) 和 (110) 表面形成,从 (110) 表面观察到10个循环后的Mn溶解.
  • 与 (110) 表面相比, (111) 表面表现出更大的稳定性.

结论:

  • Mn(2) O(4) 的电极稳定性受SEI形成率和重建表面结构的稳定性影响.
  • Mn{2}O{4}的 (111) 表面更稳定,这表明了改进电极设计的潜力.
  • 现场SXRD等直接观测技术对于理解和优化电池电极材料至关重要.