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関連する概念動画

Colors and Magnetism03:02

Colors and Magnetism

12.3K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
12.3K
Metallic Solids02:37

Metallic Solids

18.6K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
18.6K
Valence Bond Theory02:42

Valence Bond Theory

9.1K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
9.1K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

27.3K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
27.3K
Formation of Complex Ions03:45

Formation of Complex Ions

23.9K
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
23.9K
Electrodeposition01:08

Electrodeposition

703
Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
703

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関連する実験動画

Updated: Aug 28, 2025

Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques

Published on: November 11, 2013

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組成的に複雑なドーピングは,ゼロストレスのゼロコバルト層のカトド

Rui Zhang1, Chunyang Wang1, Peichao Zou1

  • 1Department of Physics and Astronomy, University of California, Irvine, CA, USA.

Nature
|September 21, 2022
PubMed
まとめ
この要約は機械生成です。

リチウムイオン電池からコバルトを取り除くことは 極めて重要です この研究により,高ニッケル,ゼロコバルトの新型カトドが導入され,より安全で長寿命のバッテリーソリューションが提供されます.

さらに関連する動画

Fabrication of Spatially Confined Complex Oxides
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Fabrication of Spatially Confined Complex Oxides

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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

Published on: August 12, 2013

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関連する実験動画

Last Updated: Aug 28, 2025

Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
10:03

Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques

Published on: November 11, 2013

25.6K
Fabrication of Spatially Confined Complex Oxides
08:45

Fabrication of Spatially Confined Complex Oxides

Published on: July 1, 2013

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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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科学分野:

  • 材料科学
  • 電気化学
  • バッテリー技術

背景:

  • コバルトの価格の変動と地政学的な問題は 自動車産業のバッテリーから コバルトを取り除くことを必要としています
  • 高ニッケル,コバルトフリー (ゼロ-Co) のカトドは,高いエネルギー密度と低コストのため,次世代のリチウムイオン電池にとって有望である.
  • 既存の高ニッケルカトドは,熱的/化学的-機械的不安定性と限られたサイクル寿命で問題に直面しています.

研究 の 目的:

  • 安定した高性能の高ニッケル,ゼロコバルトのカトド材料を開発する.
  • 現在のゼロコバルトカソッド技術に関連する安全性と安定性の懸念に対処する.
  • 先進的なリチウムイオン電池に 商業的に有効なカソッドを提供するためです

主な方法:

  • 複合的な (高エントロピー) ドーピング戦略を利用した.
  • 材料の特徴化のためにX線微分法,伝送電子顕微鏡法,ナノトモグラフィーを用いた.
  • 熱安定性を評価するために,in-situ加熱実験を行った.

主要な成果:

  • 高ニッケル,ゼロコバルト層のカソッドを成功裏に製造し,熱とサイクルの安定性を強化しました.
  • 電気化学サイクルでほぼゼロの体積変化が観察され,欠陥や亀裂を最小限に抑える.
  • NMC-532と同等の熱安定性と優れた容量保持性を示した.

結論:

  • 開発された高エントロピードーピングの ゼロコバルトカトドは 安全で長寿命の リチウムイオン電池の 実現可能な解決策です
  • この研究は,インターケレーション電極におけるストレンスと相変換を緩和するための普遍的な戦略を提示しています.
  • 高ニッケル・ゼロコバルトの カソード材料の安全性や安定性に関する 問題が解決されました