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Network Covalent Solids02:18

Network Covalent Solids

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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
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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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An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
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When two or more atoms come together to form a molecule, their atomic orbitals combine and molecular orbitals of distinct energies result. In a solid, there are a large number of atoms, and therefore a large number of atomic orbitals that may be combined into molecular orbitals. These groups of molecular orbitals are so closely placed together to form continuous regions of energies, known as the bands.
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Valence Bond Theory

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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Accelerated lithium-ion conduction in covalent organic frameworks.

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Researchers developed a novel covalent organic framework (COF) separator for lithium-ion batteries. This advanced material exhibits 8x higher ionic conductivity than conventional separators, surpassing even liquid electrolytes.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Chemical Engineering

Background:

  • Conventional separators in lithium-ion batteries (LIBs) often limit performance due to low ionic conductivity.
  • Developing advanced separators is crucial for enhancing battery efficiency and safety.

Purpose of the Study:

  • To design and evaluate a novel porous separator based on covalent organic frameworks (COFs).
  • To investigate the ionic conductivity properties of the COF separator compared to existing technologies.

Main Methods:

  • Synthesis of a porous covalent organic framework (COF) material.
  • Fabrication of the COF into a battery separator.
  • Electrochemical testing to measure ionic conductivity.

Main Results:

  • The synthesized COF separator demonstrated ionic conductivity 8 times higher than established LIB separators.
  • The effective ionic conductivity of the COF separator exceeded that of the pure liquid electrolyte.

Conclusions:

  • Covalent organic frameworks offer a promising pathway for next-generation battery separators.
  • The high ionic conductivity of COF separators can significantly improve lithium-ion battery performance.