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相关概念视频

Acid Halides to Alcohols: LiAlH4 Reduction01:19

Acid Halides to Alcohols: LiAlH4 Reduction

3.8K
Acid halides are reduced to alcohols in the presence of a strong reducing agent like lithium aluminum hydride.
The mechanism proceeds in three steps. First, the nucleophilic hydride ion attacks the carbonyl carbon of the acid halide to form a tetrahedral intermediate. Next, the carbonyl group is re-formed, and the halide ion departs as a leaving group, generating an aldehyde. A second nucleophilic attack by the hydride yields an alkoxide ion, which, upon protonation, gives a primary alcohol as...
3.8K
Preparation and Reactions of Sulfides02:26

Preparation and Reactions of Sulfides

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Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
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Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

48.5K
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. 
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Ionic Crystal Structures02:42

Ionic Crystal Structures

16.7K
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...
16.7K
Batteries and Fuel Cells03:12

Batteries and Fuel Cells

30.7K
A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
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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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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

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先进的化物/硫化物全固态金属电池,具有化接口层.

Shuangwu Xu1, Na Chen1, You Huang1

  • 1Hunan Provincial Key Laboratory of Chemical Power Sources, College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China. wanghy419@csu.edu.cn.

Chemical communications (Cambridge, England)
|December 9, 2025
PubMed
概括

研究人员开发了一种稳定的固态电解质和一种用于金属电池的人工固体电解质介相 (SEI). 这种双重方法提高了接口稳定性和电池寿命,为更安全,高性能的储能解决方案铺平了道路.

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Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
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Screening of Coatings for an All-Solid-State Battery Using In Situ Transmission Electron Microscopy
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Screening of Coatings for an All-Solid-State Battery Using In Situ Transmission Electron Microscopy
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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:

  • 电解质和金属阳极之间的界面不稳定性阻碍了固态电池的开发.
  • 实现稳定的接口对于高性能金属电池至关重要.

研究的目的:

  • 开发一种稳定的双层固态电解质,具有增强的离子导电性.
  • 在金属阳极上创建一个强大的,人工固体电解质间相 (SEI).
  • 为了提高全固态金属电池的循环稳定性和整体性能.

主要方法:

  • 使用Li3InCl6和Li6PS5Cl2层固态电解质的制造.
  • 在金属阳极上预先形成富含LiF的SEI,使用含乙烯碳酸盐的电解质.
  • 将双层电解质和预处理的阳极集成到一个具有LiCoO2阴极的全固态金属电池中.

主要成果:

  • 双层电解质表现出良好的相互兼容性和高离子导电性.
  • 预制的富含LiF的SEI有效地抑制了界面的副作用反应,并确保了稳定的界面接触.
  • 组装的全固态金属电池表现出了卓越的循环稳定性,在0.2C的100个循环后保持超过85%的容量.

结论:

  • 结合兼容的双层电解质和富含LiF的人工SEI的协同策略使高性能固态金属电池成为可能.
  • 这种双重设计显著提高了接口稳定性,从而实现了长期和可靠的能量存储.
  • 这些发现为推进更安全,更高效的固态电池技术铺平了道路.