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Related Concept Videos

Transport Number01:31

Transport Number

The transport number is the fraction of the total current carried by an ion in an electrolyte solution. It is defined as the ratio of the current carried by a specific ion to the total current flowing through the solution. The transport number, t, is central to understanding ionic mobility, which describes how fast an ion moves under the influence of an electric field. This link connects the physical behavior of ions in solution to the chemical processes that occur during electrochemical...
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The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called the...

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Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
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Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level

Published on: September 26, 2016

Study of ion diffusional motion in ionic liquid-based polymer electrolytes by simultaneous solid state NMR and DTA.

Dushyant Singh Rajput1, Koji Yamada, S S Sekhon

  • 1Department of Physics, Guru Nanak Dev University, Amritsar, 143005, India.

The Journal of Physical Chemistry. B
|January 29, 2013
PubMed
Summary

Ionic liquid polymer electrolytes show enhanced conductivity at glass transition and melting points. The amorphous phase in these electrolytes is key to high ionic conductivity and thermal stability up to 200°C.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-State Chemistry

Background:

  • Ionic liquids (ILs) are promising electrolytes due to their unique properties.
  • Polymer electrolytes offer mechanical stability but often suffer from low ionic conductivity.
  • Combining ILs with polymers can potentially enhance electrolyte performance.

Purpose of the Study:

  • To investigate the properties of polymer electrolytes incorporating 2-methyl-1,3-dipropylimidazolium dihydrogenphosphate (MDPImH2PO4).
  • To correlate ion transport mechanisms with thermal and structural properties.
  • To evaluate the thermal stability and ionic conductivity of these novel IL-based polymer electrolytes.

Main Methods:

  • Simultaneous (1)H solid-state Nuclear Magnetic Resonance (NMR) and Differential Thermal Analysis (DTA) using a specialized probe.
  • X-ray Diffraction (XRD) to analyze phase composition (amorphous vs. crystalline).
  • Fourier Transform Infrared (FTIR) spectroscopy, cyclic voltammetry (CV), and ion transport studies.

Main Results:

  • NMR line width narrowing observed at glass transition and melting temperatures, indicating increased molecular motion.
  • Onset of long-range ion diffusion and a 2-3 orders of magnitude increase in ionic conductivity at these transition temperatures.
  • Amorphous phase identified as the primary contributor to high ionic conductivity; thermal stability confirmed up to 200 °C.

Conclusions:

  • The study demonstrates a direct link between molecular dynamics, phase behavior, and ionic conductivity in IL-based polymer electrolytes.
  • MDPImH2PO4-containing polymer electrolytes exhibit significant conductivity enhancements and good thermal stability.
  • This research provides valuable insights into the design of advanced polymer electrolytes for electrochemical applications.