リチウムの豊富な層のカトドの構造的安定性を高めるための代替要素の役割
Baodan Zhang1,2, Yiming Zhang1, Xiaotong Wang1
1State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, PR China.
Journal of the American Chemical Society
|April 7, 2023
まとめ
層状のカトドの要素置換は安定性の鍵です. この研究は",乱雑度" (Li/Ni混合) が構造的および電気化学的性能と強く相関し,将来の材料設計を導くことを示しています.
科学分野:
- 材料科学
- 電気化学
- 固体化学
背景:
- エレメントドーピング/置換は,層状のカトド構造の安定性を高める.
- 現在の研究は,明確なサイト識別が欠け,説得力のないTM-O共性理論に依存しており,設計上の課題をもたらしています.
研究 の 目的:
- 関連性を調べるため
- 障害の程度
- (Li/Ni混合) と,層状のカトドにおけるインターフェース構造の安定性.
- カソード材料における指針要素の置換のための新しいパラダイムを確立する.
主な方法:
- プロトタイプ材料としてLi1.2Ni0.2Mn0.6O2を使用した.
- 体系的な特徴と分析を相関させる
- 障害の程度
- スタビリティメトリクスを使って
- TM-O環境,格子安定性,およびLi+拡散に対するMg/Ti置換効果の調査.
主要な成果:
- 強い相関関係を明らかにした.
- 障害の程度
- インターフェース構造の安定性
- Mg/Ti 置換は,対極的な効果を誘導した
- 障害の程度
- 異なるTM-O安定性,Li+拡散,およびアニオンリドックス可逆性につながる.
- 代用誘発性障害による 電気化学的性能の有意な違いを示した.
結論:
- その
- 障害の程度
- 元素置換/ドーピングによる物質改変の強力な指標です.
- カソード材料の合理的な設計のための新しいパラダイムを確立しました.
- 制御されたカチオン混合による構造的および電気化学的性質の最適化に関する洞察を提供します.
関連する概念動画
Ionic Bonding and Electron Transfer
41.8K
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.
41.8K
Complexation Equilibria: Factors Influencing Stability of Complexes
429
In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
429
Formation of Complex Ions
23.8K
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...
23.8K
Ionic Strength: Effects on Chemical Equilibria
1.6K
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...
In this solution, the primary...
1.6K
Metal-Ligand Bonds
21.2K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
21.2K
Electrodeposition
685
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...
Electrodeposition can...
685


