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Andrei Filippov1, Sayantika Bhakta1, Oleg I Gnezdilov2

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This study explores ion movement in fluorine-free gels, revealing that ion transport is influenced by the gel network

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Science

Background:

  • Fluorine-free gels are emerging as alternatives in electrochemical applications.
  • Understanding ion dynamics is crucial for optimizing gel performance.

Purpose of the Study:

  • To investigate the translational dynamics of lithium ions and (2-methoxyethoxy)acetate anions in novel fluorine-free gels.
  • To elucidate the relationship between gel structure, internal stresses, and ion transport properties.

Main Methods:

  • Utilized Pulsed-Field-Gradient Nuclear Magnetic Resonance (PFG NMR) spectroscopy with 1H and 7Li nuclei.
  • Examined thin (0.2 mm) and thick (0.7 mm) gel films at various orientations.
  • Analyzed temperature dependence and the effects of mechanical stretching on ion diffusion.

Main Results:

  • Observed two distinct diffusional decay components: slow (PVA network oscillations) and fast (mobile ions).
  • Found that Li+ cations and (MEA) anions exhibit a distribution of diffusion coefficients, not directly bound to the PVA network.
  • Ion diffusivities showed orientational dependence, were higher in thick films (normal orientation), and decreased upon stretching.

Conclusions:

  • Ion transport in these fluorine-free gels is significantly constrained by the polymer network's structure and internal stresses.
  • The findings provide insights into designing advanced gel electrolytes with tailored ion transport properties.