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関連する概念動画

Ionic Crystal Structures02:42

Ionic Crystal Structures

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...
Lewis Structures of Molecular Compounds and Polyatomic Ions02:54

Lewis Structures of Molecular Compounds and Polyatomic Ions

To draw Lewis structures for complicated molecules and molecular ions, it is helpful to follow a step-by-step procedure as outlined:
Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

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.
Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
Exceptions to the Octet Rule02:55

Exceptions to the Octet Rule

Many covalent molecules have central atoms that do not have eight electrons in their Lewis structures. These molecules fall into three categories:
Predicting Molecular Geometry02:27

Predicting Molecular Geometry

VSEPR Theory for Determination of Electron Pair Geometries

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Updated: Jul 1, 2026

Molten-Salt Synthesis of Complex Metal Oxide Nanoparticles
08:43

Molten-Salt Synthesis of Complex Metal Oxide Nanoparticles

Published on: October 27, 2018

Li2FeSiO4の構造について

Shin-ichi Nishimura1, Shogo Hayase, Ryoji Kanno

  • 1Department of Electronic Chemistry, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, 4259 Nagatsuta, Yokohama, 226-8502, Japan.

Journal of the American Chemical Society
|September 16, 2008
PubMed
まとめ

研究者らは,リチウム鉄シリケートの結晶構造を決定し,よりグリーンなリチウムイオン電池のための有望なカトド材料である. この新しい構造は,以前のモデルよりも大きく,電池技術の進歩を図る,調節された四面体から発生しています.

科学分野:

  • マテリアルサイエンス 材料科学
  • 電気化学 電気化学について
  • 固体化学 固体化学

背景:

  • リチウムイオン電池は,持続可能な未来のために不可欠です.
  • リチウム鉄シリケート (LIS) は,豊富な元素と多電子反応の可能性により,有望なカトド材料です.
  • LISの重要な成分であるLi2FeSiO4の結晶構造は,以前は未定のままでした.

研究 の 目的:

  • Li2FeSiO4.4の結晶構造を解明するために.
  • LIS カソード材料の電気化学的性質の構造的基礎を理解する.

主な方法:

  • 高解像度のシンクロトロンX線微分.
  • 電子 difrraction 実験について.

主要な成果:

  • Li2FeSiO4の結晶構造が成功裏に決定されました.
  • 判定された構造は,以前のβ-Li3PO4ベースのモデルの2倍の大きさの超格子を示しています.
  • 超網の起源は,協調四面体の周期的な変調として特定されました.

結論:

  • 決定された結晶構造は,リチウム鉄シリケート材料に関する基本的な洞察を提供します.

さらに関連する動画

1,3,5-Triphenylbenzene and Corannulene as Electron Receptors for Lithium Solvated Electron Solutions
06:56

1,3,5-Triphenylbenzene and Corannulene as Electron Receptors for Lithium Solvated Electron Solutions

Published on: October 10, 2016

The Synthesis of [Sn10(Si(SiMe3)3)4]2- Using a Metastable Sn(I) Halide Solution Synthesized via a Co-condensation Technique
12:43

The Synthesis of [Sn10(Si(SiMe3)3)4]2- Using a Metastable Sn(I) Halide Solution Synthesized via a Co-condensation Technique

Published on: November 28, 2016

関連する実験動画

Last Updated: Jul 1, 2026

Molten-Salt Synthesis of Complex Metal Oxide Nanoparticles
08:43

Molten-Salt Synthesis of Complex Metal Oxide Nanoparticles

Published on: October 27, 2018

1,3,5-Triphenylbenzene and Corannulene as Electron Receptors for Lithium Solvated Electron Solutions
06:56

1,3,5-Triphenylbenzene and Corannulene as Electron Receptors for Lithium Solvated Electron Solutions

Published on: October 10, 2016

The Synthesis of [Sn10(Si(SiMe3)3)4]2- Using a Metastable Sn(I) Halide Solution Synthesized via a Co-condensation Technique
12:43

The Synthesis of [Sn10(Si(SiMe3)3)4]2- Using a Metastable Sn(I) Halide Solution Synthesized via a Co-condensation Technique

Published on: November 28, 2016

  • この構造的な理解は,次世代リチウムイオン電池のLISカトド性能を最適化するために不可欠です.
  • この発見は,よりグリーンな社会のために先進的なバッテリー技術の開発への道を開く.