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相关概念视频

Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

41.3K
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. 
41.3K
Nitriles to Amines: LiAlH4 Reduction00:55

Nitriles to Amines: LiAlH4 Reduction

3.3K
Nitriles are reduced to amines in the presence of strong reducing agents like lithium aluminum hydride through a typical nucleophilic acyl substitution. The reaction requires two equivalents of the reducing agent. The reducing agent acts as a source of hydride ions.
As shown below, the mechanism involves three steps. Firstly, the hydride ion acting as a nucleophile attacks the nitrile carbon to form an anion. In the second step, a second equivalent of the hydride ion attacks the anion to...
3.3K
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

17.0K
Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
17.0K

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相关实验视频

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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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一个烯溶剂结构诱导了用于宽温度离子电池的稳定固体电解质介相.

Zhongming Wang1, Zhiyuan He1, Zhongsheng Wang1

  • 1State Key Laboratory of Powder Metallurgy, Central South University Changsha 410083 P. R. China meilin@csu.edu.cn lbchen@csu.edu.cn.

Chemical science
|August 30, 2024
PubMed
概括

这项研究引入了一种新型电解质,使用瓦伦尼特 (VN) 来提高离子电池 (LIB) 在广泛温度下的性能. VN电解质增强了离子转移和稳定性,克服了传统乙烯碳酸盐 (EC) 电解质的局限性.

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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:

  • 离子电池 (LIB) 在极端温度下由于离子转移缓慢和溶剂分解而面临容量退化.
  • 基于乙烯碳酸盐 (EC) 的电解质在广泛的温度应用中限制了LIB性能.

研究的目的:

  • 通过用化溶剂取代EC来设计用于广泛温度LIB的新型电解质.
  • 为了研究烯溶剂特性与电池性能之间的关系.
  • 在LIBs中增强Li+转移动力学和热稳定性.

主要方法:

  • 设计了一种新的电解质,用化溶剂代替乙烯碳酸盐 (EC).
  • 研究了酸溶剂碳链长度,还原稳定性和Li+溶解之间的相关性.
  • 作为一个有前途的溶剂,利用了瓦伦尼特里尔 (VN).
  • 在石墨中测试了基于VN的电解质‖NCM523囊细胞在广泛的温度范围内.

主要成果:

  • 瓦伦尼特 (VN) 显示出增强的最低的未被占用的分子轨道能量水平和较低的溶解能量.
  • VN促进了强大的SEI层形成,并改善了界面离子转移动力学.
  • 基于VN的电解质在20°C (室温) 达到89.84%的容量保留,在55°C达到3°C循环稳定.
  • 在-50°C时观察到1.585mS cm-1的高离子导电性.
  • 袋式电池在-40°C和-50°C时分别保持了75.52%和65.12%的室温容量.

结论:

  • 甲 (VN) 是用于宽温度离子电池的高效溶剂.
  • 基于VN的电解质显著提高了低温导电性和高温稳定性.
  • 这些电解质显示出极端环境中应用的巨大潜力.