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相关概念视频

Weak Acid Solutions04:02

Weak Acid Solutions

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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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Batteries and Fuel Cells03:12

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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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Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

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The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
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Ion Exchange01:17

Ion Exchange

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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Ionic Association01:28

Ionic Association

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The ionic association is the association of oppositely charged ions in an electrolyte solution to form ion pairs. Bjerrum defined ion pairs as two oppositely charged ions whose electrostatic attraction exceeds the thermal energy of the system, typically expressed as 2kT. Electrostatic attraction depends on ionic charge, separation distance, and the dielectric constant of the medium. Thermal energy, represented by kT, reflects the tendency of ions to move independently due to molecular motion.
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Theory of Strong Electrolytes01:23

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The interionic forces of the strong electrolytes depend on the solvent's dielectric constant, which is the ability of a solvent to store electrical energy, based on its polarizability. and the solution's concentration. In high-dielectric solvents and in dilute solutions, weak electrostatic forces keep ions apart. However, in low-dielectric solvents or concentrated solutions, stronger interionic forces may cause ions to pair up as ionic doublets despite being fully ionized. The theory of strong...
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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通过在聚合物基电解质中引入具有竞争力的协调感应效应来构建高性能全固态电池.

Tenghui Wang1, Butian Chen1, Chong Liu1

  • 1Center of Materials Science and Optoelectronics Engineering, College of Materials Science and Optoelectronic Technology, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.

Angewandte Chemie (International ed. in English)
|February 22, 2024
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概括

本研究介绍了竞争性协调诱导效应 (CCIE),以增强全固态电池 (ASSLB) 的聚合物-无机复合电解质 (PICE). CCIE提高了30°C的离子导电性和界面稳定性,使高性能ASSLBs成为可能.

关键词:
全固态电池 完全固态电池具有竞争力的协调诱导效应.电化学性能 电化学性能界面化学 界面化学聚合物-无机复合物固体电解质

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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
  • 聚合物科学 聚合物科学

背景情况:

  • 聚合物-无机复合电解质 (PICE) 为全固态电池 (ASSLB) 提供了易于加工的方法.
  • 较低的室温 (RT) Li+导电性和界面不稳定性极限 PICE在ASSLB中的应用.

研究的目的:

  • 在基于PEO的PICE中提出并研究竞争协调诱导效应 (CCIE) 的概念.
  • 确定 PICE 中的局部协调结构和接口化学之间的相关性.
  • 提高ASSLB在30°C的离子导电性和电化学性能.

主要方法:

  • 引入具有竞争力的阴离子 (Cs+) 和分子 (2,4,6-trifluoroaniline,TFA) 进入以PEO为基础的PICE.
  • 为Li+建立一个多式联运弱协调环境.
  • 对界面化学和固体电解质间相 (SEI) 形成的分析.

主要成果:

  • 在30°C时,CCIE显著提高了Li+迁移和导电性 (6.25×10^-4 S cm^-1).
  • 在接口上的Cs+丰富促进了稳定的SEI层 (LiF-Li3N-Li2O-Li2S) 的形成.
  • 组装后的ASSLB显示出在30°C的温度下优异的速度能力和循环稳定性,无需界面湿剂.

结论:

  • CCIE是设计具有高离子导电性和接口兼容性的PICE的可行策略.
  • 这种方法使得高性能ASSLB能够在室温附近工作.
  • 这些发现为优化PICE用于实际ASSLB应用提供了一种机制.