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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.
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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.
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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...
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Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
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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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Colligative Properties of Electrolytes
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Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
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Covalent-Organic-Framework Enabled Efficient Three-dimensional K-storage via Electrolyte Solvation Manipulation.

Yinshuang Pang1,2, Qingxue Lai1,2, Haobo Xia2

  • 1Zhenjiang Metrological Verification and Testing Center, Zhenjiang 212009, P. R. China.

ACS Applied Materials & Interfaces
|December 13, 2024
PubMed
Summary

This study introduces CN-COF, a novel covalent organic framework (COF) anode for potassium ion batteries (PIBs). It achieves enhanced performance through optimized electrolyte chemistry, enabling stable and efficient potassium storage.

Keywords:
Covalent organic frameworkElectrolyte chemistryK-storage mechanismNanostructure designSolid−electrolyte interphase

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Covalent-organic frameworks (COFs) show promise as anode materials for potassium ion batteries (PIBs).
  • Existing COF materials face challenges including low capacity, poor rate performance, and slow kinetics.
  • These limitations hinder the widespread application of COFs in efficient K-storage.

Purpose of the Study:

  • To develop a novel 3D COF material (CN-COF) for efficient potassium ion battery anodes.
  • To enhance interfacial stability and reaction kinetics through electrolyte chemistry compatibility.
  • To investigate the synergistic effects of nanostructure design and electrolyte chemistry on K-storage mechanisms.

Main Methods:

  • Synthesized a three-dimensional (3D) COF material (CN-COF) with high nitrogen content and graphite-like layer stacking.
  • Employed an electrolyte chemistry compatibility strategy using an optimized high-concentration THF-based electrolyte (HTE).
  • Characterized the formation of a uniform and stable solid-electrolyte interphase (SEI) with rich inorganic components.

Main Results:

  • The CN-COF material delivered a high reversible capacity of 385.8 mAh/g at 50 mA/g.
  • Maintained a capacity of 95.3 mAh/g after 1500 cycles at 500 mA/g, demonstrating excellent cycling stability.
  • Achieved rapid diffusion kinetics and enhanced interfacial stability due to the optimized SEI layer.

Conclusions:

  • The developed CN-COF material, in conjunction with the optimized HTE, significantly improves potassium ion battery anode performance.
  • The study demonstrates a viable strategy for designing advanced K-storage materials by combining nanostructure engineering and electrolyte optimization.
  • This work offers insights into manipulating K-storage mechanisms for next-generation energy storage solutions.