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相关概念视频

Weak Acid Solutions04:02

Weak Acid Solutions

41.8K
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...
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Electrodeposition01:08

Electrodeposition

1.2K
Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
1.2K
Extraction: Advanced Methods00:56

Extraction: Advanced Methods

997
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...
997
Metallic Solids02:37

Metallic Solids

20.3K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
20.3K
Bonding in Metals02:32

Bonding in Metals

51.4K
Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”. 
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Formation of Complex Ions03:45

Formation of Complex Ions

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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...
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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基于固体溶液的金属合金相对于高度可逆的金属阳极

Song Jin1,2, Yadong Ye1,2, Yijie Niu1,3

  • 1Hefei National Laboratory for Physical Sciences at the Microscale, Hefei 230026, China.

Journal of the American Chemical Society
|April 21, 2020
PubMed
概括
此摘要是机器生成的。

研究人员开发了一种新的金属阳极, 这种无石设计提高了高能量密度电池的循环稳定性和安全性.

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科学领域:

  • 电化学
  • 材料科学
  • 能量储存

背景情况:

  • 金属电池具有高能量密度,但受到阳极反应性,树突形成和循环稳定的损害.
  • 目前的减轻这些问题的策略往往无法防止表面沉积和相关的寄生反应.
  • 金属阳极上的树增长仍然是电池安全和性能的关键挑战.

研究的目的:

  • 为了展示金属阳极的新增增长化机制.
  • 为了克服金属电池的表面涂层和树突形成的局限性.
  • 提高高能量密度储能装置的循环稳定性和安全性.

主要方法:

  • 使用可逆固体溶液基合金相变驱动涂层.
  • 在金属 (几十微米厚) 中实现原子的内向增长.
  • 研究涉及固体溶液合金的化和脱化过程.

主要成果:

  • 通过向内增长成金属成功展示了无树脂涂层.
  • 达到99.5±0.2%的增强库伦比效率.
  • 获得高可逆容量1660mAhg-1 (3.3mAhcm-2).

结论:

  • 这种向内增长的涂层策略有效地防止了表面沉积和树的形成.
  • 这种方法显著提高了金属阳极的循环稳定性和安全性.
  • 对于下一代高能量密度电池来说,