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Characterization of semi-interpenetrating polymer electrolytes containing poly(vinylidene fluoride-co-hexafluoropropylene) and ether-modified polysiloxane

E. Cznotka ; Steffen Jeschke (Institutionen för fysik, Kondenserade materiens fysik (Chalmers)) ; H.D. Wiemhöfer
Solid State Ionics (0167-2738). Vol. 289 (2016), p. 35-47.
[Artikel, refereegranskad vetenskaplig]

This work presents a detailed study of a semi-interpenetrating polymer network (semi-IPN) consisting of poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP), polysiloxane-comb-propyl(triethylene oxide) (PSx) and lithium bis(trifluoromethane)sulfonimide (LiTFSI) prepared by a solution casting technique. According to differential scanning calorimetry (DSC), formation of the PVDF-HFPs crystalline phase is inhibited by the PSx which results in a significant improvement of tensile strain. A homogeneous distribution of PVDF-HFP and PSx in the membrane is analyzed using micro-FTIR mapping. Since no peak-shift due to mixing of PVDF-HFP and PSx was observed in FTIR second derivative analysis, computational models were applied to investigate the intermolecular interactions between the constituting domains of different polarity. An influence of PVDF-HFP on the Li+ transport in the ion-conducting PSx was determined by calculating the effective conductivities. The highest ionic conductivity of 7.7 × 10- 5 S cm- 1 at room temperature was reached with 15 wt.% LiTFSI. The electrochemical stability window ranges from 0.5 V to 4.6 V vs. Li/Li+ reference electrode.

Nyckelord: Differential scanning calorimetry, Polymer network, Solid polymer electrolytes

Denna post skapades 2016-05-11. Senast ändrad 2016-10-17.
CPL Pubid: 236244


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