Enhancement of ion dynamics in organic ionic plastic crystal/PVDF composite electrolytes prepared by co-electrospinning

Abstract

Organic ionic plastic crystal (OIPC) modified poly(vinylidene difluoride) (PVDF) composite fiber membrane with enhanced ion dynamics and almost pure β-PVDF are demonstrated.

Protic plastic crystal/PVDF composite membranes for Proton Exchange Membrane Fuel Cells under non-humidified conditions

“…The ionic conductivity dependence with temperature was correlated with the phase transitions observed in the material, reaching 1.27 × 10 -6 S.cm - To improve the mechanical stability of the electrolytes, OIPCs can be combined with a commercial polymer that acts as a support [22][23][24][25]. [26] Composite nanofibers based on the same plastic crystal and polymer can also be prepared by co-electrospinning, and the increased ionic conductivity of these composites is beneficial for their use as solid-state electrolytes for batteries [27].…”

Decoupled ion mobility in nano-confined ionic plastic crystal

“…Recent studies have shown that adding a second phase does not only provide a mechanical support, but also brings in an unique interface which had synergistic effect in boosting their ionic conductivities. 25 Wang et al, demonstrated that co-electrospun OIPC composites comprised of between 5 and 20 wt% of [C 2 mpyr][BF 4 ] combined with PVDF, had room temperature conductivity that was enhanced by 7-fold (compared to neat OIPC). 25 The key mechanism for this conductivity enhancement was the disruption of crystallization and enhanced ion dynamics in the OIPC phase due to the ion-dipole interactions between OIPC and PVDF molecules.…”

“…25 Wang et al, demonstrated that co-electrospun OIPC composites comprised of between 5 and 20 wt% of [C 2 mpyr][BF 4 ] combined with PVDF, had room temperature conductivity that was enhanced by 7-fold (compared to neat OIPC). 25 The key mechanism for this conductivity enhancement was the disruption of crystallization and enhanced ion dynamics in the OIPC phase due to the ion-dipole interactions between OIPC and PVDF molecules. A maximum conductivity was found at 15 wt% OIPC loading, and further increasing OIPC leads to a sharp decrease in conductivity.…”

Organic Ionic Plastic Crystal‐polymer Solid Electrolytes with High Ionic Conductivity and Mechanical Ability for Solid‐state Lithium Ion Batteries

“…Previous studies demonstrate that the ionic conductivity of OIPCs can be significantly increased by doping with lithium salts, addition of nanosize fillers, or introduction of suitable polymer materials, which is ascribed to more disordered phases or defects formation ,. In addition, considering that the plasticity feature of OIPCs leads to poor mechanical strength and flexibility, introducing suitable polymer materials in OIPC systems can improve mechanical properties . Thus, OIPC‐lithium salt‐polymer ternary system is expected to attain high ionic conductivity and good mechanical performance.…”