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相关概念视频

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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Induced Electric Dipoles01:28

Induced Electric Dipoles

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A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
Since the absolute value of potential energy holds no physical meaning, its zero value can be chosen as per...
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Dipole Moment of a Molecule
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Anionic Chain-Growth Polymerization: Mechanism01:04

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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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Aqueous Solutions and Heats of Hydration02:42

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Water and other polar molecules are attracted to ions. The electrostatic attraction between an ion and a molecule with a dipole is called an ion-dipole attraction. These attractions play an important role in the dissolution of ionic compounds in water.
When ionic compounds dissolve in water, the ions in the solid separate and disperse uniformly throughout the solution because water molecules surround and solvate the ions, reducing the strong electrostatic forces between them. This process...
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Cationic Chain-Growth Polymerization: Mechanism00:57

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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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极地群促进固体电解质的现场聚合相分离,使固态电池成为可能.

Yongrui Luo1, Yinnan Qian1, Minghui Cai1

  • 1College of Chemistry and Environmental Engineering, International Joint Research Center for Molecular Science, Shenzhen University, Shenzhen, Guangdong 518060, PR China.

Journal of colloid and interface science
|August 24, 2024
PubMed
概括

设计具有特定功能组的塑料晶体嵌入式弹性电解质 (PCEEs) 是稳定的金属电池的关键. 化PCEEs由于增强的相隔和界面稳定性,表现出卓越的性能.

关键词:
金属电池 金属电池的使用方法聚合物固体电解质的电解质聚合物诱导的相位分离.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
  • 聚合物化学 聚合物化学

背景情况:

  • 塑料晶体嵌入式弹性体电解质 (PCEEs) 是通过聚合诱导相分离 (PIPS) 产生的先进固体聚合物电解质 (SPEs).
  • 调查单体对PIPS和金属电池 (LMB) 性能的影响对于优化SPE至关重要.

研究的目的:

  • 探索不同功能组 (OH,CN,F) 对PCEE中的PIPS的影响.
  • 评估金属电池中具有不同功能组的PCEE的性能.

主要方法:

  • 在现场聚合以合成具有OH,CN和F功能群的PCEEs.
  • 使用像SEM和TEM (隐含) 这样的技术来描述PCEEs中的相分离.
  • 在对称电池和LiFePO4/Li和NCM622/Li电池中对PCEE进行电化学测试.

主要成果:

  • 具有CN和F单体的PCEE成功实现了相分离,与OH功能化的PCEE不同,由于键.
  • 化PCEE (FBA-PCEE) 与金属阳极和LFP阴极的界面稳定性非常好.
  • FBA-PCEE表现出高离子导电性 (2.02 × 10−3 S cm−1) 和0.75.5的离子转移数.
  • 使用FBA-PCEE的Li对称电池 (>1000小时) 和LiFePO4电池 (>500周期) 的稳定循环.
  • 在NCM622/Li电池中表现良好,在100个循环后保持78.95%的容量.

结论:

  • 单体功能化对PIPS和由此产生的PCEE属性产生关键影响.
  • 化单体对开发高级金属电池的高性能PCEE具有前景.
  • 这项工作为设计新型SPE提供了更安全,更高效的储能设备的见解.