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相关概念视频

Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

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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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Lewis Acids and Bases02:33

Lewis Acids and Bases

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In 1923, G. N. Lewis proposed a generalized definition of acid-base behavior in which acids and bases are identified by their ability to accept or to donate a pair of electrons and form a coordinate covalent bond.
A coordinate covalent bond (or dative bond) occurs when one of the atoms in the bond provides both bonding electrons. For example, a coordinate covalent bond occurs when a water molecule combines with a hydrogen ion to form a hydronium ion. A coordinate covalent bond also results when...
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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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Electrophiles02:28

Electrophiles

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This lesson explains the definition, classification, and characteristic features of an electrophile that are key features of nucleophilic substitution reactions. An analysis of their charge and orbital picture helps understand their reactivity for seeking electrons. Electrophiles can be classified into positive and neutral species. Other classes include free radicals and polar functional groups.
While a positive electrophile, like a proton, reacts due to its vacant, low-energy 1s orbital, the...
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Updated: Jun 28, 2025

In Situ Lithiated Reference Electrode: Four Electrode Design for In-operando Impedance Spectroscopy
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在含有PEO电解质的LiBOB-,LiDFOB-和LiBF4中初始SEI形成.

Edvin K W Andersson1, Liang-Ting Wu2, Luca Bertoli3

  • 1Department of Chemistry -Ångström Laboratory, Uppsala University Box 538 Uppsala 75121 Sweden maria.hahlin@kemi.uu.se.

Journal of materials chemistry. A
|April 18, 2024
PubMed
概括

了解电池中的固体聚合物电解质 (SPE) 分解层是关键. 由于界面分解最小,PEO:LiDFOB表现出卓越的性能,形成了更有效的保护层.

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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
  • 电池技术 电池技术

背景情况:

  • 固体聚合物电解质 (SPEs) 对电池的安全性和性能至关重要.
  • 在金属阳极接口的电解质分解层显著影响电池的功能.
  • 改进这一层对于推进电池技术至关重要.

研究的目的:

  • 为了研究三种不同的特殊物质中的电解质分解层:PEO:LiBF4,PEO:LiBOB和PEO:LiDFOB.
  • 为了将电池性能与阳极接口的初始SPE分解相关联.
  • 了解固体电解质间相 (SEI) 的形成和影响.

主要方法:

  • 电化学阻抗光谱 (EIS) 用于接口分析.
  • 静电循环评估细胞性能和容量保留.
  • 在现场沉积光电子光谱 (PES) 用于表面特征.
  • 开始分子动力学 (AIMD) 模拟用于机械洞察力.

主要成果:

  • PEO:LiDFOB在受调查的特殊产能企业中表现出最高的产能保留率.
  • 在接口处较低的SPE分解与更好的性能和更有效的保护层相关.
  • PES和AIMD在SEI中发现了聚乙烯的形成,来自乙烯自由基聚合.

结论:

  • PEO:LiDFOB电解质形成了一个更有效的分解层,初始分解较少.
  • 减少接口分解是提高电池性能和寿命的关键.
  • 通过乙烯聚合物化形成聚乙烯是基于PEO的SPE SEI的一个重要途径.