Abstract
Poly(vynilidene fluoride) P(VdF)/hexafluoropropylene (HFP) copolymers are well suited to prepare hybrid electrolytes which can be useful in solid-state electrochemical devices. We study with modulated differential scanning calorimetry (MDSC) and nuclear magnetic resonance (NMR) the polymer–solution interactions in 30 wt% P(VdF–HFP)–70 wt% (ethylene carbonate–propylene carbonate–LiN(CF 3SO 2) 3) hybrid electrolyte. We show that both 7Li-NMR lineshape narrowing and spin-lattice relaxation are driven by the ion dynamics. The behaviour of the longitudinal relaxation times, T 1, confirms that the host polymer matrix simply behaves like an inert cage for the cations, at least at the polymer-to-solution ratio examined in the present study. These results are confirmed by 13C-NMR-MAS data, which show that the presence of the polymer does not significantly affect the chemical shift changes induced in the EC/PC carbons by the imide salt.
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