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Related Concept Videos

Molecular and Ionic Solids02:54

Molecular and Ionic Solids

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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.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
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Few compounds act as strong acids. A far greater number of compounds behave as weak acids and only partially react with water, leaving a large majority of dissolved molecules in their original form and generating a relatively small amount of hydronium ions. Weak acids are commonly encountered in nature, being the substances partly responsible for the tangy taste of citrus fruits, the stinging sensation of insect bites, and the unpleasant smells associated with body odor. A familiar example of a...
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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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Theory of Strong Electrolytes01:23

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The interionic forces of the strong electrolytes depend on the solvent's dielectric constant, which is the ability of a solvent to store electrical energy, based on its polarizability. and the solution's concentration. In high-dielectric solvents and in dilute solutions, weak electrostatic forces keep ions apart. However, in low-dielectric solvents or concentrated solutions, stronger interionic forces may cause ions to pair up as ionic doublets despite being fully ionized. The theory of strong...
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Ionic Crystal Structures02:42

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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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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Solid lithium electrolytes based on an organic molecular porous solid.

Jun Heuk Park1, Kyungwon Suh, Md Rumum Rohman

  • 1Center for Self-assembly and Complexity, Institute for Basic Science (IBS), Pohang, 790-784, Republic of Korea.

Chemical Communications (Cambridge, England)
|May 12, 2015
PubMed
Summary

Researchers developed novel solid electrolytes using cucurbituril (CB[6])-based materials for enhanced lithium-ion conductivity. These advanced solid-state electrolytes exhibit high ion mobility and stable performance across temperature cycles.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-State Chemistry

Background:

  • Development of efficient solid electrolytes is crucial for advanced lithium-ion batteries.
  • Organic molecular porous solids offer potential as novel electrolyte platforms.
  • Achieving high ionic conductivity and stability in solid electrolytes remains a challenge.

Purpose of the Study:

  • To synthesize and characterize a new class of solid lithium-ion conducting electrolytes.
  • To investigate the ion transport properties and thermal stability of these novel materials.
  • To evaluate the potential of cucurbit[6]uril (CB[6])-based porous solids as lithium-ion battery electrolytes.

Main Methods:

  • Incorporation of lithium ions (Li+) into a cucurbit[6]uril (CB[6])-based organic molecular porous solid.
  • Measurement of Li+ ion conductivity using electrochemical impedance spectroscopy.
  • Determination of Li+ ion transference numbers (tLi+) via electrochemical methods.
  • Assessment of thermal stability through cyclic temperature testing.

Main Results:

  • The synthesized solid electrolytes demonstrated high Li+ ion conductivity, reaching approximately 10(-4) S cm(-1).
  • High Li+ ion mobility was confirmed with transference numbers (tLi+) in the range of 0.7-0.8.
  • The electrolytes exhibited excellent thermal stability, maintaining performance after multiple temperature cycles.

Conclusions:

  • Cucurbit[6]uril (CB[6])-based organic molecular porous solids are promising candidates for solid lithium-ion conducting electrolytes.
  • The developed electrolytes offer a viable alternative to liquid electrolytes, with enhanced safety and stability.
  • Further research into optimizing these materials could lead to next-generation lithium-ion battery technologies.