関連する実験動画
Updated: Jun 20, 2025
07:23
Construction and Testing of Coin Cells of Lithium Ion Batteries
Published on: August 2, 2012
31.5K
カチオンの空白は,リチウムカチオンのアニオンリドックスを可能にします
Seong Shik Kim1, Daniil A Kitchaev2, Eshaan S Patheria1
1Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States.
Journal of the American Chemical Society
|July 22, 2024
まとめ
カチオン空白はリチウムイオン電池のカトドにおけるアニオンリドックスに不可欠であり,より高い容量を可能にします. この研究は,アニオン酸化中のパーソルフィード形成には,金属硫化物の隣接した空白が必要であることを明らかにしています.
科学分野:
- 材料科学
- 電気化学
- 固体化学
背景:
- 従来のリチウムイオン電池のカトッドは,電荷補償のために移行金属リドックスに依存しています.
- アニオンリドックスは,従来のインターケレーション化学の容量制限を上回る経路を提供します.
- アニオン・レドックスに対する構造的要件を理解することは,先進的なバッテリー材料の開発に不可欠です.
研究 の 目的:
- バッテリー材料におけるアニオン酸化のための構造的前提条件を調査する.
- アニオンの酸化還元過程を可能にするカチオン空間の役割を解明する.
- リチウムに富んだ金属硫化物におけるアニオン酸化中のパーソルフィード結合形成を調査する.
主な方法:
- アニオン酸化機構をモデル化するための第一原理シミュレーション.
- リチウムの豊富な金属硫化物の実験合成と電気化学的特徴付け.
- Li2TiS3に制御されたカチオン空白を導入し,アニオンリドックスへの影響を調べる.
主要な成果:
- 最初の原理のシミュレーションでは,アニオンの酸化がパーソルフィードになるには,隣接するカチオン空位が必要であることが確認されています.
- 実験データによると,完全に占有されたカチオン亜格子を持つLi2TiS3は電気化学的に惰性である.
- カチオン空白の導入は,移行金属の酸化なしに,重要なアニオン還酸化活動を可能にします.
結論:
- カチオン空白は,金属硫化物における可逆性アニオン還酸化を可能にするための基本的な要件です.
- パーソルファイドの形成は,カチオン空間の存在と直接関連しています.
- この研究は,高容量アニオンリドックス材料の構造-特性関係に関する重要な洞察を提供します.
関連する概念動画
02:47Voltaic/Galvanic Cells
57.0K
Spontaneous Chemical Reactions
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
57.0K
02:48Ionic Bonding and Electron Transfer
41.4K
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.
41.4K
03:12Batteries and Fuel Cells
27.2K
A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
27.2K
03:27Ions and Ionic Charges
66.5K
In ordinary chemical reactions, the nucleus — which contains the protons and neutrons of each atom and thus identifies the element — remains unchanged. Electrons, however, can be added to atoms by transfer from other atoms, lost by transfer to other atoms, or shared with other atoms. The transfer and sharing of electrons among atoms govern the chemistry of the elements. During the formation of some compounds, atoms gain or lose electrons to form electrically charged particles called...
66.5K
03:45Formation of Complex Ions
23.6K
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...
23.6K
03:00Electrolysis
26.2K
In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
26.2K