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Article Dans Une Revue European Polymer Journal Année : 2013

Self-standing single lithium ion conductor polymer network with pendant trifluoromethanesulfonylimide groups: Li+ diffusion coefficients from PFGSTE NMR

Résumé

Solid electrolyte materials have the potential to improve performance and safety characteristics of batteries by replacing conventional solvent-based electrolytes. For this purpose, new candidate single ion conductor self-standing networks were synthesized with trifluoromethane-sulfonylimide (TFSI) lithium salt based monomer using poly(ethyleneglycol) dimethacrylate (PEGDM 750) as crosslinker. The highest ionic conductivity was 3.4 × 10−7 S cm−1 at 30 °C in the dry state. Thermal and mechanical analyses showed good thermal stability up to 190 °C and rubbery-like properties at ambient temperature. A direct relationship between ionic conductivity and glassy or rubbery state of the membranes was found. Vogel–Tammann–Fulcher behavior was observed in the dry state which is consistent with a lithium conductivity correlated with polymer chain mobility. By swelling the network in propylene carbonate, a self-standing electrolyte gel could be obtained with an ionic conductivity as high as 1 × 10−4 S cm−1 at 30 °C. The individual diffusion coefficients of mobile species in the material (19F and 7Li) were measured and quantified using pulsed-field gradient nuclear magnetic resonance (PFG-NMR). Diffusion coefficients for the most mobile components of the lithium cations and fluorinated anions at 100 °C in dry membranes have been found to be 3.4 × 10−8 cm2 s−1 and 2.1 × 10−8 cm2 s−1 respectively.
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Dates et versions

hal-03282896 , version 1 (13-07-2021)

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G.T.M. T M Nguyen, A.L. L Michan, A. Fannir, M. Viallon, Cedric Vancaeyzeele, et al.. Self-standing single lithium ion conductor polymer network with pendant trifluoromethanesulfonylimide groups: Li+ diffusion coefficients from PFGSTE NMR. European Polymer Journal, 2013, 49 (12), pp.4108-4117. ⟨10.1016/j.eurpolymj.2013.09.016⟩. ⟨hal-03282896⟩
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