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Preparation and Reactions of Sulfides02:26

Preparation and Reactions of Sulfides

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Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
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Structure and Nomenclature of Thiols and Sulfides02:17

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Thiols and sulfides are sulfur analogs of alcohols and ethers, respectively, where the sulfur atom takes the place of the oxygen atom. Thus, thiols are generally represented as RSH, where R is an alkyl substituent and —SH is the functional group. On the other hand, in sulfides, the central sulfur atom is bonded to two hydrocarbon groups on either side. Depending upon the type of group, sulfides can be either symmetrical or asymmetrical. Both thiols and sulfides display a bent geometry,...
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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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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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Ionic Association01:28

Ionic Association

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The ionic association is the association of oppositely charged ions in an electrolyte solution to form ion pairs. Bjerrum defined ion pairs as two oppositely charged ions whose electrostatic attraction exceeds the thermal energy of the system, typically expressed as 2kT. Electrostatic attraction depends on ionic charge, separation distance, and the dielectric constant of the medium. Thermal energy, represented by kT, reflects the tendency of ions to move independently due to molecular motion.
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Ion Exchange01:17

Ion Exchange

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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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Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
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Low melting non-corrosive asymmetric thioether-TFSI Li salts for solid polymer electrolytes.

Vladislav Y Shevtsov1,2, Francesco Gambino3,4, Daniil R Nosov1

  • 1Functional Polymeric and Particulate Materials Unit, Luxembourg Institute of Science and Technology (LIST), 28 avenue des Hauts-Fourneaux, L-4362 Esch-sur-Alzette, Luxembourg. alexander.shaplov@list.lu.

Chemical Communications (Cambridge, England)
|May 1, 2026
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Summary
This summary is machine-generated.

New lithium salts in solid polymer electrolytes reduce crystallinity, enhancing ion transport and stability for lithium-metal batteries. This improves battery performance and longevity.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Chemistry

Background:

  • High crystallinity in polyethylene oxide (PEO)-based solid polymer electrolytes (SPEs) hinders ion transport and limits the stability of lithium-metal batteries.
  • Developing crystalline-suppressed SPEs is crucial for advancing battery technology.

Purpose of the Study:

  • To synthesize novel low-melting thioether-TFSI lithium salts.
  • To incorporate these salts into PEO to suppress crystallinity and improve battery performance.
  • To investigate the impact of these modified SPEs on aluminum corrosion and overall cell stability.

Main Methods:

  • Synthesis of two asymmetric, low-melting thioether-TFSI lithium salts using a thiol-ene reaction.
  • Incorporation of synthesized Li salts into PEO to create modified SPEs.
  • Electrochemical testing of Li||LiFePO4 cells using the developed SPEs.
  • Analysis of Al corrosion and passivation layer formation.

Main Results:

  • The synthesized Li salts effectively suppressed PEO crystallinity.
  • The modified SPEs maintained high ionic conductivity and electrochemical performance.
  • Reduced aluminum corrosion was observed due to the formation of a stable passivation layer.
  • Improved lithium-ion compatibility and stable cycling performance in Li||LiFePO4 cells were achieved.

Conclusions:

  • Asymmetric, low-melting thioether-TFSI Li salts are effective in reducing crystallinity in PEO-based SPEs.
  • These modified SPEs offer enhanced ionic conductivity, stability, and reduced Al corrosion.
  • The developed SPEs demonstrate potential for stable and high-performance lithium-metal batteries.