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Molecular and Ionic Solids02:54

Molecular and Ionic Solids

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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...
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Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

2.0K
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...
2.0K
Electrolyte and Nonelectrolyte Solutions02:21

Electrolyte and Nonelectrolyte Solutions

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Substances that undergo either a physical or a chemical change in solution to yield ions that can conduct electricity are called electrolytes. If a substance yields ions in solution, that is, if the compound undergoes 100% dissociation, then the substance is a strong electrolyte. Complete dissociation is indicated by a single forward arrow. For example, water-soluble ionic compounds like sodium chloride dissociate into sodium cations and chloride anions in aqueous solution.
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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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Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

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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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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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ナトリウム電池の固体ポリマー電解質としてのポリメリ化イオン液体の理解

Faezeh Makhlooghiazad1,2, Luis Miguel Guerrero Mejía1,2, Greg Rollo-Walker1,2

  • 1Institute for Frontier Materials, Burwood, Victoria 3125, Australia.

Journal of the American Chemical Society
|January 15, 2024
PubMed
まとめ

この研究では,ジブロックコポリマーを使用してナトリウム電池のための先進的な固体ポリマー電解質 (SPEs) が開発されました. これらの新しい電解質はイオン伝導性が向上し,安定した性能を示し,より安全で効率的なナトリウムエネルギー貯蔵の道を開きます.

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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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科学分野:

  • 材料科学
  • 電気化学
  • ポリマー科学

背景:

  • 固体ポリマー電解質 (SPEs) は,ナトリウムベースのバッテリーに柔軟かつ費用対効果の高い代替品を提供します.
  • SPEの課題は,高いイオン伝導性と堅固な機械的性質を達成することです.

研究 の 目的:

  • ナトリウム電池の固体ポリマー電解質として,AB二ブロックコポリマー,PS-PEA (BuImTFSI) を調査する.
  • 塩とイオン液体を含む二次と三次電解質システムを研究し,性能を向上させる.

主な方法:

  • 熱特性と相分離を分析する差分スキャニング熱計 (DSC)
  • イオン伝導性とNa/Na対称性の電化学分析
  • 離子-ポリマーの相互作用を理解するための光譜分析.

主要な成果:

  • 塩とイオン液を添加することで,イオン伝導性が強化され,アニオン-ポリマーの相互作用が弱まった.
  • 安定したナトリウムプレッティング/ストリッピングは,70 °Cと高電流密度でNa/Na対称な細胞で観察された.
  • 高温や異なる速さで,ナデレックスFePO4電池は優れた容量保持とクーロンビック効率を示した.

結論:

  • 溶媒のない二重ブロックコポリマー電解質は,高性能ナトリウムベースのエネルギー貯蔵に重要な可能性を秘めている.
  • 電解質の組成を調整することで,イオン伝導性と電気化学的安定性を最適化できます.
  • この研究は次世代電池のための先進的な材料の開発に寄与します.