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A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
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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...
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Besides iodine, other oxidizing or reducing agents can serve as titrants in redox titrations. Common oxidizing titrants include KMnO4, cerium(IV), and K2Cr2O7. The choice of oxidizing titrants depends on factors like stability, cost, analyte strength, and reaction rate between the analyte and titrant. KMnO4 is a strong oxidizing titrant that reduces from Mn(VII) to Mn(II) in a highly acidic solution, simultaneously oxidizing the analyte to a higher oxidation state. In this case, KMnO4 acts as a...
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In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
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Enhancing anionic redox stability via oxygen coordination configurations.

Haoxin Li1,2,3, Yining Li2,3, Xiaolin Zhao2,3

  • 1School of Chemistry and Materials Science, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, 1 Sub-lane Xiangshan, Hangzhou, 310024, China. jliu@mail.sic.ac.cn.

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Summary
This summary is machine-generated.

Anionic redox in lithium-rich cathodes boosts energy density but causes fading. Optimizing anion coordination, particularly tetrahedral oxygen, enhances stability and reversibility for better battery performance.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-State Chemistry

Background:

  • Anionic redox in lithium-rich cathode materials offers a pathway to higher battery energy density.
  • Capacity fading caused by anionic redox-induced structural changes limits practical applications.

Purpose of the Study:

  • To investigate the influence of anion coordination structure on anionic redox reversibility in lithium-rich cathode materials.
  • To identify strategies for suppressing capacity fading and improving the stability of these materials.

Main Methods:

  • Comprehensive study of spinel-like Li1.7Mn1.6O3.7F0.3 and layered Li2MnO3 model systems.
  • Electronic structure analysis to understand the stability of oxygen anions.
  • Correlation of anionic redox stability with the Li-O-TM bond angle.

Main Results:

  • Tetrahedral oxygen demonstrates higher kinetic and thermodynamic stability than octahedral oxygen, suppressing anion aggregation.
  • Deeper 2p lone-pair states in tetrahedral oxygen contribute to its enhanced stability.
  • The Li-O-TM bond angle is identified as a key parameter for anionic redox stability.

Conclusions:

  • Anionic redox stability is significantly influenced by the polyhedral coordination structure.
  • Tuning the Li-O-TM bond angle via transition metal (TM) substitution offers a route to design stable, high-energy-density cathode materials.