Conduction mechanism in polymeric membranes based on PEO or PVdF-HFP and containing a piperidinium ionic liquid
Journal article, 2019

Two types of polymer electrolyte membranes were prepared using poly(ethylene oxide) (PEO) and poly(vinylidene difluoride-co-hexafluoropropylene) (PVdF-HFP), with different amounts of the ionic liquid N-methyl-N-propylpiperidinium bis(trifluoromethane-sulfonyl) imide ([PP13][TFSI]) added. The results from differential scanning calorimetry and conductivity measurements show that in the case of PVdF-HFP membranes the glass transition temperature T-g decreases and the room temperature ionic conductivity increases with increasing content of the ionic liquid (up to 60 wt.%). However, in the case of PEO based membranes Tg is less significantly affected and the room temperature ionic conductivity increases only up to 30 wt.% of ionic liquid, beyond which a steady value of about 5.10(-5) S/cm is reached. The results from Raman spectroscopy show that the characteristic vibrational mode of the TFSI anion at similar to 742 cm(-1) is weakly affected in the membranes prepared from PVdF-HFP, whereas for those based on PEO it has a clearer composition dependence. These results suggest ion-ion and ion-polymer interactions of different nature, which together with the different nanomorphologies adopted by PEO and PVdF-HFP, as revealed by X-ray scattering, give rise to different composition dependences of the macroscopically measured ionic conductivity. (C) 2019 The Authors. Published by Elsevier Ltd.

Poly(vinylidene difluoride-co-hexafluoropropylene)

Ionic liquid and ionic conductivity

Poly(ethylene oxide)

Author

Khalid Elamin

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Anna Martinelli Group

Mansoureh Shojaatalhoseini

Chalmers, Physics, Condensed Matter Physics

Olesia Danyliv

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Anna Martinelli Group

Anna Martinelli

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Anna Martinelli Group

Jan Swenson

Chalmers, Physics, Biological Physics

Electrochimica Acta

0013-4686 (ISSN)

Vol. 299 979-986

Subject Categories

Inorganic Chemistry

Ceramics

Materials Chemistry

DOI

10.1016/j.electacta.2018.12.154

More information

Latest update

3/19/2019