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関連する概念動画

Molecular and Ionic Solids02:54

Molecular and Ionic Solids

17.0K
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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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.
62.4K
Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

41.3K
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. 
41.3K
Ionic Crystal Structures02:42

Ionic Crystal Structures

14.2K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
14.2K
Ionic Bonds00:42

Ionic Bonds

118.1K
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...
118.1K
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

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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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還元不可能な固体電解質における障害媒介のイオン伝導性

Victor Landgraf1, Mengfu Tu1, Wenxuan Zhao1

  • 1Faculty of Applied Sciences, Delft University of Technology, 2629JB Delft, The Netherlands.

Journal of the American Chemical Society
|May 26, 2025
PubMed
まとめ
この要約は機械生成です。

研究者は,リチウム窒素をLi2Sに溶解することによって,新しい還元不能の固体電解質,Li2+xS1-xNxを開発しました. これらの電解質は高いイオン伝導性を示し,次世代アノドを持つ固体電池の性能損失を防ぐ.

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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
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Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
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科学分野:

  • 材料科学
  • 電気化学
  • 固体化学

背景:

  • 固体電池は リチウムイオン電池よりも高いエネルギー密度を提供します 特にリチウム金属やシリコンなどの高度なアノドを使用します
  • 現在の固体電解質は,これらのアノドに必要な低い電圧で分解され,リチウム損失と抵抗の増大を引き起こします.
  • 低動作電圧で熱力学的に安定した電解質を開発することは,性能低下を防ぐために不可欠です.

研究 の 目的:

  • 還元不能の固体電解質の新種を発見し特徴づけること
  • これらの新しい材料のイオン伝導性の強化の背後にあるメカニズムを調査する.
  • 無秩序なイオン伝導体を理解するための理論的枠組みを提供する.

主な方法:

  • リチウム・ニトリドをLi2Sアンチフッ化物構造に溶かすことによる機械化学合成.
  • 結晶のLi2+xS1-xNx相の合成
  • 阻力スペクトロスコーピーを用いたイオン伝導度測定.
  • 第一原理密度関数理論 (DFT) の計算
  • 環境特有の活性化エネルギーによる浸透分析

主要な成果:

  • 室温で導電率>0.2 mS cm-1 の高導電性結晶のLi2+xS1-xNx相を発見した.
  • Li2+xS1-xNxにおけるアニオン亜網層の乱れは,Li2Sと比較して最大10^5のイオン伝導性を高めることを実証した.
  • 不規則なイオン導体における伝導性の強化を説明する理論的枠組みの開発.
  • 窒素含有量の増加が導電性を改善し,活性化エネルギーを低下させる方法の合理化.

結論:

  • 新しいLi2+xS1-xNx固体電解質は,低アノド動作電圧で安定し,分解を防止します.
  • この発見は 複雑な固体電解質の理解と設計への道を示しています
  • この研究は,固体電池の性能,特にアノドサイドの安定性に関する主要な課題に取り組んでいます.