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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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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

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The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
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Electrolyte and Nonelectrolyte Solutions02:21

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Substances that undergo either a physical or a chemical change in solution to yield ions that can conduct electricity are called electrolytes. If a substance yields ions in solution, that is, if the compound undergoes 100% dissociation, then the substance is a strong electrolyte. Complete dissociation is indicated by a single forward arrow. For example, water-soluble ionic compounds like sodium chloride dissociate into sodium cations and chloride anions in aqueous solution.
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Ion Exchange01:17

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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Cationic Chain-Growth Polymerization: Mechanism00:57

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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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Understanding Polymerized Ionic Liquids as Solid Polymer Electrolytes for Sodium Batteries.

Faezeh Makhlooghiazad1,2, Luis Miguel Guerrero Mejía1,2, Greg Rollo-Walker1,2

  • 1Institute for Frontier Materials, Burwood, Victoria 3125, Australia.

Journal of the American Chemical Society
|January 15, 2024
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This study developed advanced solid polymer electrolytes (SPEs) for sodium batteries using diblock copolymers. These novel electrolytes demonstrate enhanced ionic conductivity and stable performance, paving the way for safer and more efficient sodium energy storage.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Science

Background:

  • Solid polymer electrolytes (SPEs) offer a flexible and cost-effective alternative for sodium-based batteries.
  • Challenges in SPEs include achieving high ionic conductivity and robust mechanical properties.

Purpose of the Study:

  • To investigate an AB diblock copolymer, PS-PEA(BuImTFSI), as a solid polymer electrolyte for sodium batteries.
  • To explore binary and ternary electrolyte systems incorporating salt and ionic liquid for enhanced performance.

Main Methods:

  • Differential scanning calorimetry (DSC) to analyze thermal properties and phase separation.
  • Electrochemical analysis of ionic conductivity and Na/Na symmetrical cells.
  • Spectroscopic analysis to understand ion-polymer interactions.

Main Results:

  • The addition of salt and ionic liquid enhanced ionic conductivity through plasticization and weakened anion-polymer interactions.
  • Stable sodium plating/stripping was observed in Na/Na symmetrical cells at 70 °C and high current densities.
  • A Na|NaFePO4 cell demonstrated excellent capacity retention and Coulombic efficiency at elevated temperatures and varying rates.

Conclusions:

  • Solvent-free diblock copolymer electrolytes show significant potential for high-performance sodium-based energy storage.
  • Tailoring electrolyte composition can optimize ionic conductivity and electrochemical stability.
  • This work contributes to the development of advanced materials for next-generation batteries.