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関連する概念動画

Electrolyte and Nonelectrolyte Solutions02:21

Electrolyte and Nonelectrolyte Solutions

62.3K
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.
62.3K
Aqueous Solutions and Heats of Hydration02:42

Aqueous Solutions and Heats of Hydration

14.4K
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...
14.4K
Ionic Strength: Effects on Chemical Equilibria01:19

Ionic Strength: Effects on Chemical Equilibria

1.4K
The addition of an inert ionic compound increases the solubility of a sparingly soluble salt. For example, adding potassium nitrate to a saturated solution of calcium sulfate significantly enhances the solubility of calcium sulfate. Le Châtelier's principle cannot predict this shift in the equilibrium. Instead, this could be explained in terms of changes in the effective concentration of the ions in solution in the presence of added inert salt.
In this solution, the primary...
1.4K
Ionic Strength: Overview01:12

Ionic Strength: Overview

1.3K
The ionic strength of a solution is a quantitative way of expressing the total electrolyte concentration of a solution. This concept was first introduced in 1921 by two American physical chemists, Gilbert N. Lewis and Merle Randall, while describing the activity coefficient of strong electrolytes. During the calculation of ionic strength (I or μ), all the cations and anions are considered. However, the concentration (c) of an ion with a greater charge number (z) has a greater contribution...
1.3K
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

16.9K
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...
16.9K
Ionic Bonds00:42

Ionic Bonds

118.0K
Overview
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
Ionic bonds are reversible electrostatic interactions between ions...
118.0K

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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

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固体電池用の極度の塩分濃度のポリ (イオン液体) 電解質

Shinji Kondou1,2,3,4, Mohanad Abdullah5, Ivan Popov6

  • 1Institute for Frontier Materials, Deakin University, Burwood, VIC 3125, Australia.

Journal of the American Chemical Society
|November 19, 2024
PubMed
まとめ

研究者らは,カチオンのポリイオン液体と非対称アニオンを使用して,高度な塩中のポリマー電解質を開発しました. この技術革新により,塩の濃度が高くなり,イオン伝導性と安定性が向上し,バッテリーの性能が向上します.

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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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Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature

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Ultrasound Velocity Measurement in a Liquid Metal Electrode
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Ultrasound Velocity Measurement in a Liquid Metal Electrode

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科学分野:

  • 材料科学
  • 電気化学
  • ポリマー化学

背景:

  • ポリマー・イン・塩の電解質は,固体電池のリチウムイオン伝導性を改善することを目的としています.
  • ポリマーマトリックス内の塩の安定性と高い伝導性を維持することが課題です.
  • 塩分濃度の高い影響に関する基本的な理解は限られている.

研究 の 目的:

  • 非常に高い塩分を含有する 安定した塩中のポリマー電解質を開発する.
  • 極度の塩分濃度が電解質の性質に与える影響を調査する.
  • ポリマー電解質におけるイオン輸送機構の理解を深める.

主な方法:

  • アニオンの非対称性を有する結晶化抵抗性塩とカチオン型ポリイオン液体 (polyIL) の統合.
  • リチウム塩含有量の90%までの塩中のポリマー電解質の製造
  • 調整構造,ガラス変換,イオン伝導性,イオン輸送のダイナミクスの分析.

主要な成果:

  • 安定したポリマー-イン-塩電解質を最大90%のリチウム塩で達成した.
  • 高い塩分濃度でイオン伝導性が向上したことが示された.
  • 塩濃度,構造力学,イオン輸送の関係を解明した.

結論:

  • 開発されたポリILベースの塩中のポリマー電解質は,高性能の固体電池のための有望な経路を提供します.
  • 高塩分負荷の影響を理解することは,電解質の設計を最適化するために不可欠です.
  • この研究は,先進的なポリマー電解質の将来の開発に重要な洞察を提供します.