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Related Concept Videos

Resonance and Hybrid Structures02:16

Resonance and Hybrid Structures

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According to the theory of resonance, if two or more Lewis structures with the same arrangement of atoms can be written for a molecule, ion, or radical, the actual distribution of electrons is an average of that shown by the various Lewis structures.
Resonance Structures and Resonance Hybrids
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N–O and N=O bonds.
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Ionic Crystal Structures02:42

Ionic Crystal Structures

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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...
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Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

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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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Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

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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. 
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Lewis Structures of Molecular Compounds and Polyatomic Ions02:54

Lewis Structures of Molecular Compounds and Polyatomic Ions

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To draw Lewis structures for complicated molecules and molecular ions, it is helpful to follow a step-by-step procedure as outlined:
36.9K
Covalent Bonding and Lewis Structures02:46

Covalent Bonding and Lewis Structures

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Compared to ionic bonds, which results from the transfer of electrons between metallic and nonmetallic atoms, covalent bonds result from the mutual attraction of atoms for a “shared” pair of electrons.
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Related Experiment Video

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Tuning Oxide Properties by Oxygen Vacancy Control During Growth and Annealing
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Stabilizing Layered Structure in Aqueous Electrolyte via O2-Type Oxygen Stacking.

Liang Xue1, Chao Wang1, Hanghui Liu2

  • 1Key Laboratory for Soft Chemistry and Functional Materials of Ministry of Education, Nanjing University of Science and Technology, Nanjing, 210094, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|July 26, 2022
PubMed
Summary

Altering oxygen stacking in layered lithium cobalt oxide (LiCoO2) from O3 to O2 significantly enhances structural stability and cycle life in aqueous lithium-ion batteries (ALIBs). This modification mitigates proton attack, improving performance in neutral electrolytes.

Keywords:
O2 stackingaqueous electrolytecathode materialslayered structurelithium-ion batteries

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Battery Technology

Background:

  • O3-type layered cathode materials offer high energy density but suffer from poor cycle life in aqueous electrolytes.
  • The practical application of aqueous lithium-ion batteries (ALIBs) is limited by the short cycle life of current cathode materials.

Purpose of the Study:

  • To improve the structural stability and cycle performance of LiCoO2 in neutral aqueous electrolytes.
  • To investigate the effect of oxygen stacking sequence on the stability of layered cathode materials.

Main Methods:

  • Synthesized O2-type LiCoO2 and compared its electrochemical performance with O3-type LiCoO2 in neutral aqueous electrolyte.
  • Analyzed structural stability and degradation mechanisms under aqueous conditions.

Main Results:

  • O2-type LiCoO2 demonstrated significantly improved cycle performance compared to O3-type LiCoO2.
  • The O2 structure effectively mitigated structural degradation caused by proton attack.
  • Stronger Co-O bonds and hindered Co migration in O2-type LiCoO2 contributed to enhanced stability.

Conclusions:

  • Regulating oxygen stacking sequence is a viable strategy to enhance the structural stability of layered cathode materials for ALIBs.
  • O2-type LiCoO2 presents a promising cathode material for aqueous lithium-ion batteries due to its improved cycle life and stability.