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相关概念视频

Acid Halides to Alcohols: LiAlH4 Reduction01:19

Acid Halides to Alcohols: LiAlH4 Reduction

2.7K
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...
2.7K
Acid Halides to Ketones: Gilman Reagent01:14

Acid Halides to Ketones: Gilman Reagent

2.7K
Lithium dialkyl cuprate, also known as Gilman reagents, selectively reduces acid halides to ketones. The acid chloride is treated with Gilman reagent at −78 °C in the presence of ether solution to produce a ketone in good yield.
As shown below, the mechanism proceeds in two steps. First, one of the alkyl groups of the reagent acts as a nucleophile and attacks the acyl carbon of the acid chloride to form a tetrahedral intermediate. This is followed by the reformation of the carbon–oxygen...
2.7K
Batteries and Fuel Cells03:12

Batteries and Fuel Cells

27.0K
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...
27.0K
Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

41.2K
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. 
41.2K

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相关实验视频

Updated: Jun 6, 2025

Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
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基于对全固态电池的间隙转换反应的多电子转移化物阴极材料.

Xu Zhou1, Ming Jiang2, Yuhao Duan1,3

  • 1Division of Energy Storage, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China.

Angewandte Chemie (International ed. in English)
|December 3, 2024
PubMed
概括

新的化物阴极材料LixFeXx+2显著提高了全固态电池 (ASSLB) 的能量密度. 这些材料可以实现无阴解体的设计,实现更安全,更强大的电池的高容量和离子导电性.

关键词:
化物正极材料是化物正极材料.高能量密度的高能量密度.间隔转换反应 - 转换反应多个电子转移的多个电子转移.固态电池是一种固态电池.

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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:

  • 与传统的离子电池相比,全固态电池 (ASSLB) 承诺提高安全性和能量密度.
  • 目前的ASSLB受限于低容量的氧化物阴极材料,这些材料依赖于介质机制,并且需要显著的阴解质含量.
  • 开发高性能阴极材料对于推进ASSLB技术至关重要.

研究的目的:

  • 在ASSLB中引入新型化物阴极材料 (LixFeXx+2) 作为传统氧化物阴极的替代品.
  • 研究这些新化物材料的电化学性能和操作机制.
  • 为了证明使用这些先进的阴极在ASSLB中实现高能量密度和提高安全性的潜力.

主要方法:

  • LixFeXx+2 (X=Cl, Br) 阴极材料的合成和表征.
  • 含有LiFeCl3活性物质 (95 wt%) 的无阴解质ASSLB的电化学测试.
  • 对合-转换合反应机制的分析,包括无形铁形成的作用.

主要成果:

  • xFeXx+2材料通过3mol e-转移合-转换合反应运行,比传统氧化物具有更高的容量.
  • 使用95%重量LiFeCl的无催化剂ASSLB实现了446mAhg-1的容量和912Whkg-1的能量密度.
  • 在转换过程中形成的无形铁催化了反向反应,使可逆的间转换和高循环稳定性成为可能.

结论:

  • 化物阴极材料 (LixFeXx+2) 代表了高能量密度ASSLBs的重大进步.
  • 独特的间歇转换机制和无阴解质的设计克服了氧化物阴极的局限性.
  • 这些发现为下一代更安全,更强大的固态电池铺平了道路.