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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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Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
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Room temperature ionic liquids with two symmetric ions.

Daniel Rauber1, Frederik Philippi2, Daniel Schroeder1

  • 1Department of Chemistry, Saarland University Campus B 2.2 66123 Saarbrücken Germany daniel.rauber@uni-saarland.de.

Chemical Science
|September 29, 2023
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Summary
This summary is machine-generated.

New room temperature ionic liquids use symmetric ions, challenging previous assumptions. Ether-containing side chains boost entropy, enabling lower melting points with simpler synthesis.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Chemical Engineering

Background:

  • Room temperature ionic liquids (RTILs) traditionally rely on asymmetric organic cations.
  • Ion asymmetry is believed to enhance disorder, counteracting strong ionic interactions and lowering melting points.
  • Synthesizing and purifying asymmetric cations for RTILs is often complex and demanding.

Purpose of the Study:

  • To introduce novel RTILs utilizing formally symmetric cations and anions.
  • To explore the role of ether-containing side chains in achieving low melting points in symmetric ionic liquids.
  • To challenge the established paradigm requiring asymmetric ions for room-temperature fluidity in ionic liquids.

Main Methods:

  • Design and synthesis of novel ionic liquids with symmetric ions incorporating ether side chains.
  • Utilizing molecular dynamics simulations to investigate ion behavior and conformational changes.
  • Experimental characterization of the synthesized ionic liquids' properties, including melting point.

Main Results:

  • Successfully synthesized novel RTILs where both cation and anion are formally symmetric.
  • Incorporation of ether-containing side chains in the cation significantly increased configurational entropy.
  • Molecular dynamics simulations revealed transient 'curled' configurations of the ether side chains.
  • The new RTILs exhibit room temperature fluidity, contradicting the need for asymmetric ions.

Conclusions:

  • The study presents a new class of RTILs based on symmetric ions, simplifying their design and synthesis.
  • Ether-containing side chains are key to achieving high entropy and low melting points in symmetric ionic liquids.
  • These findings offer new, more accessible pathways for designing and developing advanced ionic liquid materials.